iOS开发经验总结(一)_app

概述1、禁止手机睡眠 [UIApplication sharedApplication].idleTimerDisabled = YES; 2、隐藏某行cell - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{// 如果是你需要隐藏的那一行，返回高度为0 1、禁止手机睡眠

[UIApplication sharedApplication].IDleTimerDisabled = YES;

2、隐藏某行cell

- (@H_404_17@CGfloat)tableVIEw:(@H_404_17@UItableVIEw *)tableVIEw heightForRowAtIndexPath:(@H_404_17@NSIndexPath *)indexPath{// 如果是你需要隐藏的那一行，返回高度为0    if(indexPath.row == YouWantToHIDeRow)        return 0;     return 44;}// 然后再你需要隐藏cell的时候调用[self.tableVIEw beginUpdates];[self.tableVIEw endUpdates];

3、禁用button高亮

button.adjustsImageWhenHighlighted = NO;或者在创建的时候 @H_404_17@UIbutton *button = [@H_404_17@UIbutton buttonWithType:@H_404_17@UIbuttonTypeCustom];

4、tablevIEw遇到这种报错Failed to obtain a cell from its dataSource

是因为你的cell被调用的早了。先循环使用了cell，后又创建cell。顺序错了
可能原因：1、xib的cell没有注册 2、内存中已经有这个cell的缓存了(也就是说通过你的cellID找到的cell并不是你想要的类型)，这时候需要改下cell的标识

5、cocoa pods报这个错误：unable to access 'https://github.com/facebook/pop.git/': Operation timed out after 0 milliseconds with 0 out of 0 bytes received

解决办法：原因可能是网络问题，网络请求超时了，只需要重试就行了

6、cocoa pods 出现ERROR: While executing gem ... (Errno::EPERM)

解决办法：
https://segmentfault.com/q/1010000002926243

7、动画切换window的根控制器

// options是动画选项[@H_404_17@UIVIEw TransitionWithVIEw:[@H_404_17@UIApplication sharedApplication].keyWindow duration:0.5f options:@H_404_17@UIVIEwAnimationoptionTransitionCrossdissolve animations:^{        @H_404_17@BOol oldState = [@H_404_17@UIVIEw areAnimationsEnabled];        [@H_404_17@UIVIEw setAnimationsEnabled:NO];        [@H_404_17@UIApplication sharedApplication].keyWindow.rootVIEwController = [RootVIEwController new];        [@H_404_17@UIVIEw setAnimationsEnabled:oldState];    } completion:^(@H_404_17@BOol finished) {    }];

8、去除数组中重复的对象

NSArray *newArr = [oldArr valueForKeyPath:@“@distinctUnionOfObjects.self"];

9、编译的时候遇到 no such file or directory: ／users／apple／XXX

是因为编译的时候，在此路径下找不到这个文件，解决这个问题，首先是是要检查缺少的文件是不是在工程中，如果不在工程中，需要从本地拖进去，如果发现已经存在工程中了，或者拖进去还是报错，这时候需要去build phases中搜索这个文件，这时候很可能会搜出现两个相同的文件，这时候，有一个路径是正确的，删除另外一个即可。如果删除了还是不行，需要把两个都删掉，然后重新往工程里拖进这个文件即可

build phases 10、iOS8系统中，tableVIEw最好实现下-tableVIEw: heightForRowAtIndexPath:这个代理方法，要不然在iOS8中可能就会出现显示不全或者无法响应事件的问题 11、iOS8中实现侧滑功能的时候这个方法必须实现，要不然在iOS8中无法侧滑

// 必须写的方法，和editactionsForRowAtIndexPath配对使用，里面什么不写也行- (voID)tableVIEw:(UItableVIEw *)tableVIEw commitEditingStyle:(UItableVIEwCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {}

12、三个通知

NSSystemTimeZoneDIDChangeNotification监听修改时间界面的两个按钮状态变化
UIApplicationSignificantTimeChangeNotification 监听用户改变时间（只要点击自动设置按钮就会调用） NSSystemClockDIDChangeNotification 监听用户修改时间（时间不同才会调用）

13、SDWebImage本地缓存有时候会害人。如果之前缓存过一张图片，即使下次服务器换了这张图片，但是图片url没换，用sDWebimage下载下来的还是以前那张,所以遇到这种问题，不要先去怼服务器，清空下缓存再试就好了。 14、上线前注意：

1）、删掉代码中所有的测试代码
2）、如果后台有审核模式，提醒后台开启此模式
3）、主流程再跑一跑
4）、全局搜索waring，检查所有标记waring的地方

15、跳进app权限设置

// 跳进app设置            if (UIApplicationopenSettingsURLString != NulL) {                UIApplication *application = [UIApplication sharedApplication];                NSURL *URL = [NSURL URLWithString:UIApplicationopenSettingsURLString];                if ([application respondsToSelector:@selector(openURL:options:completionHandler:)]) {                    [application openURL:URL options:@{} completionHandler:nil];                } else {                    [application openURL:URL];                }            }

16、给一个vIEw截图

@H_404_17@UIGraphicsBeginImageContextWithOptions(vIEw.bounds.size,YES,0.0);    [vIEw.layer renderInContext:@H_404_17@UIGraphicsGetCurrentContext()];    @H_404_17@UIImage *img = @H_404_17@UIGraphicsGetimageFromCurrentimageContext();    @H_404_17@UIGraphicsEndImageContext();

17、开发中如果要动态修改tableVIEw的tableheaderVIEw或者tableFooterVIEw的高度，需要给tableVIEw重新设置，而不是直接更改高度。正确的做法是重新设置一下tableVIEw.tableFooterVIEw = 更改过高度的vIEw。为什么？其实在iOS8以上直接改高度是没有问题的，在iOS8中出现了contentSize不准确的问题，这是解决办法。 18、注意对象为nil的时候，调用此对象分类的方法不会执行 19、collectionVIEw的内容小于其宽高的时候是不能滚动的，设置可以滚动：

collectionVIEw.alwaysBounceHorizontal = YES;collectionVIEw.alwaysBounceVertical = YES;

20、设置navigationbar上的Title颜色和大小

[self.navigationController.navigationbar setTitleTextAttributes:@{@H_404_17@NSForegroundcolorAttributename : [@H_404_17@UIcolor youcolor],@H_404_17@NSFontAttributename : [@H_404_17@UIFont systemFontOfSize:15]}]

21、颜色转图片

+ (@H_404_17@UIImage *)cl_imageWithcolor:(@H_404_17@UIcolor *)color {  @H_404_17@CGRect rect = @H_404_17@CGRectMake(0.0f,0.0f,1.0f,1.0f);  @H_404_17@UIGraphicsBeginImageContext(rect.size);  @H_404_17@CGContextRef context = @H_404_17@UIGraphicsGetCurrentContext();  @H_404_17@CGContextSetFillcolorWithcolor(context,[color @H_404_17@CGcolor]);  @H_404_17@CGContextFillRect(context,rect);  @H_404_17@UIImage *image = @H_404_17@UIGraphicsGetimageFromCurrentimageContext();  @H_404_17@UIGraphicsEndImageContext();  return image;}

22、vIEw设置圆角

#define VIEwborderRadius(VIEw,Radius,WIDth,color)\ \ [VIEw.layer setCornerRadius:(Radius)];\ [VIEw.layer setMasksToBounds:YES];\ [VIEw.layer setborderWIDth:(WIDth)];\ [VIEw.layer setbordercolor:[color CGcolor]] // vIEw圆角

23、强／弱引用

#define WeakSelf(type)  __weak typeof(type) weak##type = type; // weak#define StrongSelf(type)  __strong typeof(type) type = weak##type; // strong

24、由角度转换弧度

#define degreesToRadian(x) (M_PI * (x) / 180.0)

25、由弧度转换角度

#define RadianTodegrees(radian) (radian*180.0)/(M_PI)

26、获取图片资源

#define Getimage(imagename) [UIImage imagenamed:[Nsstring stringWithFormat:@"%@",imagename]]

27、获取temp

#define PathTemp NstemporaryDirectory()

28、获取沙盒 document

#define Pathdocument [NSSearchPathForDirectorIEsInDomains(NSdocumentDirectory,NSUserDomainMask,YES) firstObject]

29、获取沙盒 Cache

#define PathCache [NSSearchPathForDirectorIEsInDomains(NSCachesDirectory,YES) firstObject]

30、GCD代码只执行一次

#define kdisPATCH_ONCE_BLOCK(onceBlock) static dispatch_once_t oncetoken; dispatch_once(&oncetoken,onceBlock);

31、自定义NSLog

#ifdef DEBUG#define NSLog(fmt,...) NSLog((@"%s [line %d] " fmt),__PRETTY_FUNCTION__,__liNE__,##__VA_ARGS__)#else#define NSLog(...)#endif

32、Font

#define FontL(s)             [UIFont systemFontOfSize:s weight:UIFontWeightlight]#define FontR(s)             [UIFont systemFontOfSize:s weight:UIFontWeightRegular]#define FontB(s)             [UIFont systemFontOfSize:s weight:UIFontWeightBold]#define FontT(s)             [UIFont systemFontOfSize:s weight:UIFontWeightThin]#define Font(s)              FontL(s)

33、FORMAT

#define FORMAT(f,...)      [Nsstring stringWithFormat:f,## __VA_ARGS__]

34、在主线程上运行

#define kdisPATCH_MAIN_THREAD(mainQueueBlock) dispatch_async(dispatch_get_main_queue(),mainQueueBlock);

35、开启异步线程

#define kdisPATCH_GLOBAL_QUEUE_DEFAulT(globalQueueBlock) dispatch_async(dispatch_get_global_queue(disPATCH_QUEUE_PRIORITY_DEFAulT,0),globalQueueBlocl);

36、通知

#define NOTIF_ADD(n,f)     [[NSNotificationCenter defaultCenter] addobserver:self selector:@selector(f) name:n object:nil]#define NOTIF_POST(n,o)    [[NSNotificationCenter defaultCenter] postNotificationname:n object:o]#define NOTIF_REMV()        [[NSNotificationCenter defaultCenter] removeObserver:self]

37、随机颜色

+ (@H_404_17@UIcolor *)Randomcolor {    @H_404_17@NSInteger aRedValue = arc4random() % 255;    @H_404_17@NSInteger aGreenValue = arc4random() % 255;    @H_404_17@NSInteger aBlueValue = arc4random() % 255;    @H_404_17@UIcolor *randcolor = [@H_404_17@UIcolor colorWithRed:aRedValue / 255.0f green:aGreenValue / 255.0f blue:aBlueValue / 255.0f Alpha:1.0f];    return randcolor;}

38、获取window

+(@H_404_17@UIWindow*)getwindow {    @H_404_17@UIWindow* win = nil; //[UIApplication sharedApplication].keyWindow;    for (ID item in [@H_404_17@UIApplication sharedApplication].windows) {        if ([item class] == [@H_404_17@UIWindow class]) {            if (!((@H_404_17@UIWindow*)item).hIDden) {                win = item;                break;            }        }    }    return win;}

39、修改textFIEld的placeholder的字体颜色、大小

[textFIEld setValue:[UIcolor redcolor] forKeyPath:@"_placeholderLabel.textcolor"];[textFIEld setValue:[UIFont boldSystemFontOfSize:16] forKeyPath:@"_placeholderLabel.Font"];

40、统一收起键盘

[[[UIApplication sharedApplication] keyWindow] endEditing:YES];

41、控制屏幕旋转，在控制器中写

/** 是否支持自动转屏 */- (@H_404_17@BOol)shouldautorotate {    return YES;}/** 支持哪些屏幕方向 */- (@H_404_17@UIInterfaceOrIEntationMask)supportedInterfaceOrIEntations {    return @H_404_17@UIInterfaceOrIEntationMaskLandscapeleft | @H_404_17@UIInterfaceOrIEntationMaskLandscapeRight;}/** 默认的屏幕方向（当前VIEwController必须是通过模态出来的UIVIEwController（模态带导航的无效）方式展现出来的，才会调用这个方法） */- (@H_404_17@UIInterfaceOrIEntation)preferredInterfaceOrIEntationForPresentation {    return @H_404_17@UIInterfaceOrIEntationLandscapeleft | @H_404_17@UIInterfaceOrIEntationLandscapeRight;}

42、获取app缓存大小

- (@H_404_17@CGfloat)getCachSize {    @H_404_17@NSUInteger imageCacheSize = [[SDImageCache sharedImageCache] getSize];    //获取自定义缓存大小    //用枚举器遍历 一个文件夹的内容    //1.获取 文件夹枚举器    @H_404_17@Nsstring *myCachePath = [@H_404_17@NSHomeDirectory() stringByAppendingPathComponent:@"library/Caches"];    @H_404_17@NSDirectoryEnumerator *enumerator = [[@H_404_17@NSfileManager defaultManager] enumeratorAtPath:myCachePath];    __block @H_404_17@NSUInteger count = 0;    //2.遍历    for (@H_404_17@Nsstring *filename in enumerator) {        @H_404_17@Nsstring *path = [myCachePath stringByAppendingPathComponent:filename];        @H_404_17@NSDictionary *fileDict = [[@H_404_17@NSfileManager defaultManager] attributesOfItemAtPath:path error:nil];        count += fileDict.fileSize;//自定义所有缓存大小    }    // 得到是字节 转化为M    @H_404_17@CGfloat totalSize = ((@H_404_17@CGfloat)imageCacheSize+count)/1024/1024;    return totalSize;}

43、清理app缓存

- (voID)handleClearVIEw {    //删除两部分    //1.删除 sd 图片缓存    //先清除内存中的图片缓存    [[SDImageCache sharedImageCache] clearMemory];    //清除磁盘的缓存    [[SDImageCache sharedImageCache] cleardisk];    //2.删除自己缓存    @H_404_17@Nsstring *myCachePath = [@H_404_17@NSHomeDirectory() stringByAppendingPathComponent:@"library/Caches"];    [[@H_404_17@NSfileManager defaultManager] removeItemAtPath:myCachePath error:nil];}

44、模型转字典

static @H_404_17@NSSet *classes;- (@H_404_17@NSMutableDictionary *)getParameterDictionary {    @H_404_17@NSMutableDictionary *dict = [@H_404_17@NSMutableDictionary dictionary];    Class c = self.class;    while (c) {        unsigned count;        objc_property_t *propertIEs = class_copyPropertyList([c class],&count);        for (int i = 0; i < count; i++) {            @H_404_17@Nsstring *key = [@H_404_17@Nsstring stringWithUTF8String:property_getname(propertIEs[i])];            dict[key] = [self valueForKey:key];        }        free(propertIEs);        // 获得父类        c = class_getSuperclass(c);        if ([self isClassFromFoundation:c]) break;    }    return dict;}- (@H_404_17@BOol)isClassFromFoundation:(Class)c{    if (c == [@H_404_17@NSObject class] || c == [@H_404_17@NSManagedobject class]) return YES;    __block @H_404_17@BOol result = NO;    [[self foundationClasses] enumerateObjectsUsingBlock:^(Class foundationClass,@H_404_17@BOol *stop) {        if ([c isSubclassOfClass:foundationClass]) {            result = YES;            *stop = YES;        }    }];    return result;}- (@H_404_17@NSSet *)foundationClasses{    if (classes == nil) {        // 集合中没有NSObject，因为几乎所有的类都是继承自NSObject，具体是不是NSObject需要特殊判断        classes = [@H_404_17@NSSet setWithObjects:                              [@H_404_17@NSURL class],[@H_404_17@NSDate class],[@H_404_17@NSValue class],[@H_404_17@NSData class],[@H_404_17@NSError class],[@H_404_17@NSArray class],[@H_404_17@NSDictionary class],[@H_404_17@Nsstring class],[@H_404_17@NSAttributedString class],nil];    }    return classes;}

45、交换两个方法实现

Class aClass = [self class];         SEL originalSelector = @selector(vIEwWillAppear:);         SEL swizzledSelector = @selector(xxx_vIEwWillAppear:);         Method originalMethod = class_getInstanceMethod(aClass,originalSelector);         Method swizzledMethod = class_getInstanceMethod(aClass,swizzledSelector);         BOol dIDAddMethod =             class_addMethod(aClass,originalSelector,method_getImplementation(swizzledMethod),method_getTypeEnCoding(swizzledMethod));         if (dIDAddMethod) { class_replaceMethod(aClass,swizzledSelector,method_getImplementation(originalMethod),method_getTypeEnCoding(originalMethod)); } else { method_exchangeImplementations(originalMethod,swizzledMethod); }

46、打印百分号和引号

NSLog(@"%%");    NSLog(@"\"");

47、几个常用权限判断

if ([@H_404_17@CLLocationManager authorizationStatus] ==kCLAuthorizationStatusDenIEd) {        @H_404_17@NSLog(@"没有定位权限");    }    @H_404_17@AVAuthorizationStatus statusVIDeo = [@H_404_17@AVCaptureDevice authorizationStatusForMediaType:@H_404_17@AVMediaTypeVIDeo];    if (statusVIDeo == @H_404_17@AVAuthorizationStatusDenIEd) {        @H_404_17@NSLog(@"没有摄像头权限");    }    //是否有麦克风权限    @H_404_17@AVAuthorizationStatus statusAudio = [@H_404_17@AVCaptureDevice authorizationStatusForMediaType:@H_404_17@AVMediaTypeAudio];    if (statusAudio == @H_404_17@AVAuthorizationStatusDenIEd) {        @H_404_17@NSLog(@"没有录音权限");    }    [PHPhotolibrary requestAuthorization:^(PHAuthorizationStatus status) {        if (status == PHAuthorizationStatusDenIEd) {            @H_404_17@NSLog(@"没有相册权限");        }    }];

48、获取手机型号

+ (Nsstring *)getDeviceInfo {    struct utsname systemInfo;    uname(&systemInfo);    Nsstring *platform = [Nsstring stringWithCString:systemInfo.machine enCoding:NSASCIIStringEnCoding];    if ([platform isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";    if ([platform isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";    if ([platform isEqualToString:@"iPhone2,1"]) return @"iPhone 3GS";    if ([platform isEqualToString:@"iPhone3,1"]) return @"iPhone 4";    if ([platform isEqualToString:@"iPhone3,2"]) return @"iPhone 4";    if ([platform isEqualToString:@"iPhone3,3"]) return @"iPhone 4";    if ([platform isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";    if ([platform isEqualToString:@"iPhone5,1"]) return @"iPhone 5";    if ([platform isEqualToString:@"iPhone5,2"]) return @"iPhone 5";    if ([platform isEqualToString:@"iPhone5,3"]) return @"iPhone 5c";    if ([platform isEqualToString:@"iPhone5,4"]) return @"iPhone 5c";    if ([platform isEqualToString:@"iPhone6,1"]) return @"iPhone 5s";    if ([platform isEqualToString:@"iPhone6,2"]) return @"iPhone 5s";    if ([platform isEqualToString:@"iPhone7,1"]) return @"iPhone 6 Plus";    if ([platform isEqualToString:@"iPhone7,2"]) return @"iPhone 6";    if ([platform isEqualToString:@"iPhone8,1"]) return @"iPhone 6s";    if ([platform isEqualToString:@"iPhone8,2"]) return @"iPhone 6s Plus";    // 日行两款手机型号均为日本独占，可能使用索尼FeliCa支付方案而不是苹果支付    if ([platform isEqualToString:@"iPhone9,1"])    return @"国行、日版、港行iPhone 7";    if ([platform isEqualToString:@"iPhone9,2"])    return @"港行、国行iPhone 7 Plus";    if ([platform isEqualToString:@"iPhone9,3"])    return @"美版、台版iPhone 7";    if ([platform isEqualToString:@"iPhone9,4"])    return @"美版、台版iPhone 7 Plus";    if ([platform isEqualToString:@"iPhone8,4"]) return @"iPhone SE";    if ([platform isEqualToString:@"iPod1,1"]) return @"iPod touch 1G";    if ([platform isEqualToString:@"iPod2,1"]) return @"iPod touch 2G";    if ([platform isEqualToString:@"iPod3,1"]) return @"iPod touch 3G";    if ([platform isEqualToString:@"iPod4,1"]) return @"iPod touch 4G";    if ([platform isEqualToString:@"iPod5,1"]) return @"iPod touch 5G";    if ([platform isEqualToString:@"iPad1,1"]) return @"iPad 1G";    if ([platform isEqualToString:@"iPad2,1"]) return @"iPad 2";    if ([platform isEqualToString:@"iPad2,2"]) return @"iPad 2";    if ([platform isEqualToString:@"iPad2,3"]) return @"iPad 2";    if ([platform isEqualToString:@"iPad2,4"]) return @"iPad 2";    if ([platform isEqualToString:@"iPad2,5"]) return @"iPad Mini 1G";    if ([platform isEqualToString:@"iPad2,6"]) return @"iPad Mini 1G";    if ([platform isEqualToString:@"iPad2,7"]) return @"iPad Mini 1G";    if ([platform isEqualToString:@"iPad3,1"]) return @"iPad 3";    if ([platform isEqualToString:@"iPad3,2"]) return @"iPad 3";    if ([platform isEqualToString:@"iPad3,3"]) return @"iPad 3";    if ([platform isEqualToString:@"iPad3,4"]) return @"iPad 4";    if ([platform isEqualToString:@"iPad3,5"]) return @"iPad 4";    if ([platform isEqualToString:@"iPad3,6"]) return @"iPad 4";    if ([platform isEqualToString:@"iPad4,1"]) return @"iPad Air";    if ([platform isEqualToString:@"iPad4,2"]) return @"iPad Air";    if ([platform isEqualToString:@"iPad4,3"]) return @"iPad Air";    if ([platform isEqualToString:@"iPad4,4"]) return @"iPad Mini 2G";    if ([platform isEqualToString:@"iPad4,5"]) return @"iPad Mini 2G";    if ([platform isEqualToString:@"iPad4,6"]) return @"iPad Mini 2G";    if ([platform isEqualToString:@"i386"]) return @"iPhone Simulator";    if ([platform isEqualToString:@"x86_64"]) return @"iPhone Simulator";    return platform;}

49、长按复制功能

- (voID)vIEwDIDLoad{    [self.vIEw addGestureRecognizer:[[@H_404_17@UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(pasteBoard:)]];}- (voID)pasteBoard:(@H_404_17@UILongPressGestureRecognizer *)longPress {    if (longPress.state == @H_404_17@UIGestureRecognizerStateBegan) {        @H_404_17@UIPasteboard *pasteboard = [@H_404_17@UIPasteboard generalPasteboard];        pasteboard.string = @"需要复制的文本";    }}

50、cocoapods升级

在终端执行 sudo gem install -n / usr / local / bin cocoapods --pre

51、设置启动页后，依然显示之前的

删除app，手机重启，重新安装

52、判断图片类型

//通过图片Data数据第一个字节 来获取图片扩展名- (@H_404_17@Nsstring *)ContentTypeForImageData:(@H_404_17@NSData *)data{    uint8_t c;    [data getBytes:&c length:1];    switch (c)    {        case 0xFF:            return @"jpeg";        case 0x89:            return @"png";        case 0x47:            return @"gif";        case 0x49:        case 0x4D:            return @"tiff";        case 0x52:        if ([data length] < 12) {            return nil;        }        @H_404_17@Nsstring *testString = [[@H_404_17@Nsstring alloc] initWithData:[data subdataWithRange:@H_404_17@NSMakeRange(0,12)] enCoding:@H_404_17@NSASCIIStringEnCoding];        if ([testString hasPrefix:@"RIFF"]            && [testString hasSuffix:@"WEBP"])        {            return @"webp";        }        return nil;    }    return nil;}

53、获取手机和app信息

@H_404_17@NSDictionary *infoDictionary = [[@H_404_17@NSBundle mainBundle] infoDictionary];   @H_404_17@CFShow(infoDictionary);  // app名称  @H_404_17@Nsstring *app_name = [infoDictionary objectForKey:@"CFBundledisplayname"];   // app版本  @H_404_17@Nsstring *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];   // app build版本  @H_404_17@Nsstring *app_build = [infoDictionary objectForKey:@"CFBundLeversion"];      //手机序列号     @H_404_17@Nsstring* IDentifIErNumber = [[@H_404_17@UIDevice currentDevice] uniqueIDentifIEr];      @H_404_17@NSLog(@"手机序列号: %@",IDentifIErNumber);      //手机别名： 用户定义的名称     @H_404_17@Nsstring* userPhonename = [[@H_404_17@UIDevice currentDevice] name];      @H_404_17@NSLog(@"手机别名: %@",userPhonename);      //设备名称     @H_404_17@Nsstring* devicename = [[@H_404_17@UIDevice currentDevice] systemname];      @H_404_17@NSLog(@"设备名称: %@",devicename );      //手机系统版本     @H_404_17@Nsstring* phoneVersion = [[@H_404_17@UIDevice currentDevice] systemVersion];      @H_404_17@NSLog(@"手机系统版本: %@",phoneVersion);      //手机型号     @H_404_17@Nsstring* phoneModel = [[@H_404_17@UIDevice currentDevice] model];      @H_404_17@NSLog(@"手机型号: %@",phoneModel );      //地方型号 （国际化区域名称）     @H_404_17@Nsstring* localPhoneModel = [[@H_404_17@UIDevice currentDevice] localizedModel];      @H_404_17@NSLog(@"国际化区域名称: %@",localPhoneModel );      @H_404_17@NSDictionary *infoDictionary = [[@H_404_17@NSBundle mainBundle] infoDictionary];      // 当前应用名称     @H_404_17@Nsstring *appCurname = [infoDictionary objectForKey:@"CFBundledisplayname"];      @H_404_17@NSLog(@"当前应用名称：%@",appCurname);      // 当前应用软件版本 比如：1.0.1     @H_404_17@Nsstring *appCurVersion = [infoDictionary objectForKey:@"CFBundleShortVersionString"];      @H_404_17@NSLog(@"当前应用软件版本:%@",appCurVersion);      // 当前应用版本号码 int类型     @H_404_17@Nsstring *appCurVersionNum = [infoDictionary objectForKey:@"CFBundLeversion"];      @H_404_17@NSLog(@"当前应用版本号码：%@",appCurVersionNum);

54、获取一个类的所有属性

ID LenderClass = objc_getClass("Lender");unsigned @H_404_17@int outCount,i;objc_property_t *propertIEs = class_copyPropertyList(LenderClass,&outCount);for (i = 0; i < outCount; i++) {    objc_property_t property = propertIEs[i];    fprintf(stdout,"%s %s\n",property_getname(property),property_getAttributes(property));}

55、image圆角

- (@H_404_17@UIImage *)circleimage{    // NO代表透明    @H_404_17@UIGraphicsBeginImageContextWithOptions(self.size,NO,1);    // 获得上下文    @H_404_17@CGContextRef ctx = @H_404_17@UIGraphicsGetCurrentContext();    // 添加一个圆    @H_404_17@CGRect rect = @H_404_17@CGRectMake(0,0,self.size.wIDth,self.size.height);    // 方形变圆形    @H_404_17@CGContextAddEllipseInRect(ctx,rect);    // 裁剪    @H_404_17@CGContextClip(ctx);    // 将图片画上去    [self drawInRect:rect];    @H_404_17@UIImage *image = @H_404_17@UIGraphicsGetimageFromCurrentimageContext();    @H_404_17@UIGraphicsEndImageContext();    return image;}

56、image拉伸

+ (UIImage *)resizableImage:(Nsstring *)imagename{    UIImage *@H_404_17@image = [UIImage imagenamed:imagename];    CGfloat imageW = @H_404_17@image.@H_404_17@size.@H_404_17@wIDth;    CGfloat imageH = @H_404_17@image.@H_404_17@size.@H_404_17@height;    @H_404_17@return [@H_404_17@image resizableImageWithCAPInsets:UIEdgeInsetsMake(imageH * 0.5,imageW * 0.5,imageH * 0.5,imageW * 0.5) resizingMode:UIImageResizingModeStretch];}

57、JsON字符串转字典

+ (@H_404_17@NSDictionary *)parseJsONStringToNSDictionary:(@H_404_17@Nsstring *)JsONString {    @H_404_17@NSData *JsONData = [JsONString dataUsingEnCoding:@H_404_17@NSUTF8StringEnCoding];    @H_404_17@NSDictionary *responseJsON = [@H_404_17@NSJsONSerialization JsONObjectWithData:JsONData options:@H_404_17@NSJsONReadingMutableLeaves error:nil];    return responseJsON;}

58、身份z号验证

- (@H_404_17@BOol)valIDateIDentityCard {    @H_404_17@BOol flag;    if (self.length <= 0) {        flag = NO;        return flag;    }    @H_404_17@Nsstring *regex2 = @"^(\d{14}|\d{17})(\d|[xX])$";    @H_404_17@nspredicate *IDentityCardPredicate = [@H_404_17@nspredicate predicateWithFormat:@"SELF MATCHES %@",regex2];    return [IDentityCardPredicate evaluateWithObject:self];}

59、获取设备mac地址

+ (Nsstring *)macAddress {    int                 mib[6];    size_t              len;    char                *buf;    unsigned char       *ptr;    struct if_msghdr    *ifm;    struct sockaddr_dl  *sdl;    mib[0] = CTL_NET;    mib[1] = AF_ROUTE;    mib[2] = 0;    mib[3] = AF_link;    mib[4] = NET_RT_IFList;    if((mib[5] = if_nametoindex("en0")) == 0) {        @H_404_17@printf("Error: if_nametoindex error\n");        return NulL;    }    if(sysctl(mib,6,NulL,&len,0) < 0) {        @H_404_17@printf("Error: sysctl,take 1\n");        return NulL;    }    if((buf = @H_404_17@malloc(len)) == NulL) {        @H_404_17@printf("Could not allocate memory. Rrror!\n");        return NulL;    }    if(sysctl(mib,buf,take 2");        return NulL;    }    ifm = (struct if_msghdr *)buf;    sdl = (struct sockaddr_dl *)(ifm + 1);    ptr = (unsigned char *)LLADDR(sdl);    Nsstring *outstring = [Nsstring stringWithFormat:@"%02X:%02X:%02X:%02X:%02X:%02X",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5)];    @H_404_17@free(buf);    return outstring;}

60、导入自定义字体库

1、找到你想用的字体的 ttf 格式，拖入工程
2、在工程的pList中增加一行数组，“Fonts provIDed by application”
3、为这个key添加一个item，value为你刚才导入的ttf文件名
4、直接使用即可：label.Font = [UIFont FontWithname:@"你刚才导入的ttf文件名" size:20.0]；

61、拿到当前正在显示的控制器，不管是push进去的，还是present进去的都能拿到

- (@H_404_17@UIVIEwController *)getVisibleVIEwControllerFrom:(@H_404_17@UIVIEwController*)vc {    if ([vc isKindOfClass:[@H_404_17@UINavigationController class]]) {        return [self getVisibleVIEwControllerFrom:[((@H_404_17@UINavigationController*) vc) visibleVIEwController]];    }else if ([vc isKindOfClass:[@H_404_17@UITabbarController class]]){        return [self getVisibleVIEwControllerFrom:[((@H_404_17@UITabbarController*) vc) selectedVIEwController]];    } else {        if (vc.presentedVIEwController) {            return [self getVisibleVIEwControllerFrom:vc.presentedVIEwController];        } else {            return vc;        }    }}

62、runtime为一个类动态添加属性

// 动态添加属性的本质是: 让对象的某个属性与值产生关联        objc_setAssociatedobject(self,WZBPlaceholderVIEwKey,placeholderVIEw,OBJC_ASSOCIATION_RETAIN_NONATOMIC);

63、获取runtime为一个类动态添加的属性

objc_getAssociatedobject(self,WZBPlaceholderVIEwKey);

64、KVO监听某个对象的属性

// 添加监听者[self addobserver:self forKeyPath:property options:NSkeyvalueObservingOptionNew context:nil];// 当监听的属性值变化的时候会来到这个方法- (voID)observeValueForKeyPath:(Nsstring *)keyPath ofObject:(ID)object change:(NSDictionary *)change context:(voID *)context {    if ([keyPath isEqualToString:@"property"]) {       [self textVIEwTextChange];       } else {     }}

65、Reachability判断网络状态

NetworkStatus status = [[Reachability reachabilityForInternetConnection] currentReachabilityStatus];    if (status == NotReachable) {        NSLog(@"当前设备无网络");    }    if (status == ReachableViaWiFi) {        NSLog(@"当前wifi网络");    }    if (status == ReachableViaWWAN) {        NSLog(@"当前蜂窝移动网络");    }

66、AFNetworking监听网络状态

// 监听网络状况    AFNetworkReachabilityManager *mgr = [AFNetworkReachabilityManager sharedManager];    [mgr setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {        switch (status) {            case AFNetworkReachabilityStatusUnkNown:                break;            case AFNetworkReachabilityStatusNotReachable: {                [SVProgressHUD showInfoWithStatus:@"当前设备无网络"];            }                break;            case AFNetworkReachabilityStatusReachableViaWiFi:                [SVProgressHUD showInfoWithStatus:@"当前Wi-Fi网络"];                break;            case AFNetworkReachabilityStatusReachableViaWWAN:                [SVProgressHUD showInfoWithStatus:@"当前蜂窝移动网络"];                break; default:                break;        }    }];    [mgr startMonitoring];

67、透明颜色不影响子视图透明度

[UIcolor colorWithRed:<#(CGfloat)#> green:<#(CGfloat)#> blue:<#(CGfloat)#> Alpha:<#(CGfloat)#>];

68、取图片某一点的颜色

if (point.x < 0 || point.y < 0) return nil;    @H_404_17@CGImageRef imageRef = self.CGImage;    @H_404_17@NSUInteger wIDth = @H_404_17@CGImageGetWIDth(imageRef);    @H_404_17@NSUInteger height = @H_404_17@CGImageGetHeight(imageRef);    if (point.x >= wIDth || point.y >= height) return nil;    unsigned char *rawData = malloc(height * wIDth * 4);    if (!rawData) return nil;    @H_404_17@CGcolorSpaceRef colorSpace = @H_404_17@CGcolorSpaceCreateDeviceRGB();    @H_404_17@NSUInteger bytesPerPixel = 4;    @H_404_17@NSUInteger bytesPerRow = bytesPerPixel * wIDth;    @H_404_17@NSUInteger bitsPerComponent = 8;    @H_404_17@CGContextRef context = @H_404_17@CGBitmapContextCreate(rawData,wIDth,height,bitsPerComponent,bytesPerRow,colorSpace,kCGImageAlphaPremultiplIEdLast                                                 | kCGBitmapByteOrder32Big);    if (!context) {        free(rawData);        return nil;    }    @H_404_17@CGcolorSpaceRelease(colorSpace);    @H_404_17@CGContextDrawImage(context,@H_404_17@CGRectMake(0,height),imageRef);    @H_404_17@CGContextRelease(context);    int byteIndex = (bytesPerRow * point.y) + point.x * bytesPerPixel;    @H_404_17@CGfloat red   = (rawData[byteIndex]     * 1.0) / 255.0;    @H_404_17@CGfloat green = (rawData[byteIndex + 1] * 1.0) / 255.0;    @H_404_17@CGfloat blue  = (rawData[byteIndex + 2] * 1.0) / 255.0;    @H_404_17@CGfloat Alpha = (rawData[byteIndex + 3] * 1.0) / 255.0;    @H_404_17@UIcolor *result = nil;    result = [@H_404_17@UIcolor colorWithRed:red green:green blue:blue Alpha:Alpha];    free(rawData);    return result;

69、判断该图片是否有透明度通道

- (BOol)hasAlphaChannel{    CGImageAlphaInfo @H_404_17@Alpha = CGImageGetAlphaInfo(self.CGImage);    return (@H_404_17@Alpha == kCGImageAlphaFirst ||            @H_404_17@Alpha == kCGImageAlphaLast ||            @H_404_17@Alpha == kCGImageAlphaPremultiplIEdFirst ||            @H_404_17@Alpha == kCGImageAlphaPremultiplIEdLast);}

70、获得灰度图

+ (@H_404_17@UIImage*)covertToGrayImageFromImage:(@H_404_17@UIImage*)sourceImage{    int wIDth = sourceImage.size.wIDth;    int height = sourceImage.size.height;    @H_404_17@CGcolorSpaceRef colorSpace = @H_404_17@CGcolorSpaceCreateDeviceGray();    @H_404_17@CGContextRef context = @H_404_17@CGBitmapContextCreate (nil,8,kCGImageAlphaNone);    @H_404_17@CGcolorSpaceRelease(colorSpace);    if (context == NulL) {        return nil;    }    @H_404_17@CGContextDrawImage(context,sourceImage.CGImage);    @H_404_17@CGImageRef contextRef = @H_404_17@CGBitmapContextCreateImage(context);    @H_404_17@UIImage *grayImage = [@H_404_17@UIImage imageWithCGImage:contextRef];    @H_404_17@CGContextRelease(context);    @H_404_17@CGImageRelease(contextRef);    return grayImage;}

71、根据bundle中的文件名读取图片

+ (UIImage *)imageWithfilename:(Nsstring *)name {    Nsstring *extension = @"png";    NSArray *components = [name componentsSeparatedByString:@"."];    if ([components count] >= 2) {        NSUInteger lastIndex = components.count - 1;        extension = [components objectAtIndex:lastIndex];        name = [name substringToIndex:(name.length-(extension.length+1))];    }    // 如果为Retina屏幕且存在对应图片，则返回Retina图片，否则查找普通图片    if ([UIScreen mainScreen].scale == 2.0) {        name = [name stringByAppendingString:@"@2x"];        Nsstring *@H_404_17@path = [[NSBundle mainBundle] pathForResource:name ofType:extension];        if (@H_404_17@path != nil) {            return [UIImage imageWithContentsOffile:@H_404_17@path];        }    }    if ([UIScreen mainScreen].scale == 3.0) {        name = [name stringByAppendingString:@"@3x"];        Nsstring *@H_404_17@path = [[NSBundle mainBundle] pathForResource:name ofType:extension];        if (@H_404_17@path != nil) {            return [UIImage imageWithContentsOffile:@H_404_17@path];        }    }    Nsstring *@H_404_17@path = [[NSBundle mainBundle] pathForResource:name ofType:extension];    if (@H_404_17@path) {        return [UIImage imageWithContentsOffile:@H_404_17@path];    }    return nil;}

72、合并两个图片

+ (@H_404_17@UIImage*)mergeImage:(@H_404_17@UIImage*)firstimage withImage:(@H_404_17@UIImage*)secondImage {    @H_404_17@CGImageRef firstimageRef = firstimage.CGImage;    @H_404_17@CGfloat firstWIDth = @H_404_17@CGImageGetWIDth(firstimageRef);    @H_404_17@CGfloat firstHeight = @H_404_17@CGImageGetHeight(firstimageRef);    @H_404_17@CGImageRef secondImageRef = secondImage.CGImage;    @H_404_17@CGfloat seconDWIDth = @H_404_17@CGImageGetWIDth(secondImageRef);    @H_404_17@CGfloat secondHeight = @H_404_17@CGImageGetHeight(secondImageRef);    @H_404_17@CGSize mergedSize = @H_404_17@CGSizeMake(MAX(firstWIDth,seconDWIDth),MAX(firstHeight,secondHeight));    @H_404_17@UIGraphicsBeginImageContext(mergedSize);    [firstimage drawInRect:@H_404_17@CGRectMake(0,firstWIDth,firstHeight)];    [secondImage drawInRect:@H_404_17@CGRectMake(0,seconDWIDth,secondHeight)];    @H_404_17@UIImage *image = @H_404_17@UIGraphicsGetimageFromCurrentimageContext();    @H_404_17@UIGraphicsEndImageContext();    return image;}

73、根据bundle中的图片名创建imagevIEw

+ (ID)imageVIEwWithImagenamed:(Nsstring*)imagename{    return [[UIImageVIEw alloc] initWithImage:[UIImage imagenamed:imagename]];}

74、为imageVIEw添加倒影

@H_404_17@CGRect frame = self.frame;    frame.origin.y += (frame.size.height + 1);    @H_404_17@UIImageVIEw *reflectionImageVIEw = [[@H_404_17@UIImageVIEw alloc] initWithFrame:frame];    self.clipsToBounds = TRUE;    reflectionImageVIEw.contentMode = self.contentMode;    [reflectionImageVIEw setimage:self.image];    reflectionImageVIEw.transform = @H_404_17@CGAffinetransformMakeScale(1.0,-1.0);    @H_404_17@CALayer *reflectionLayer = [reflectionImageVIEw layer];    @H_404_17@CAGradIEntLayer *gradIEntLayer = [@H_404_17@CAGradIEntLayer layer];    gradIEntLayer.bounds = reflectionLayer.bounds;    gradIEntLayer.position = @H_404_17@CGPointMake(reflectionLayer.bounds.size.wIDth / 2,reflectionLayer.bounds.size.height * 0.5);    gradIEntLayer.colors = [@H_404_17@NSArray arrayWithObjects:                            (ID)[[@H_404_17@UIcolor clearcolor] @H_404_17@CGcolor],(ID)[[@H_404_17@UIcolor colorWithRed:1.0 green:1.0 blue:1.0 Alpha:0.3] @H_404_17@CGcolor],nil];    gradIEntLayer.startPoint = @H_404_17@CGPointMake(0.5,0.5);    gradIEntLayer.endPoint = @H_404_17@CGPointMake(0.5,1.0);    reflectionLayer.mask = gradIEntLayer;    [self.supervIEw addSubvIEw:reflectionImageVIEw];

75、画水印

// 画水印- (voID) setimage:(@H_404_17@UIImage *)image withWaterMark:(@H_404_17@UIImage *)mark inRect:(@H_404_17@CGRect)rect{    if ([[[@H_404_17@UIDevice currentDevice] systemVersion] floatValue] >= 4.0)    {        @H_404_17@UIGraphicsBeginImageContextWithOptions(self.frame.size,0.0);    }    //原图    [image drawInRect:self.bounds];    //水印图    [mark drawInRect:rect];    @H_404_17@UIImage *newPic = @H_404_17@UIGraphicsGetimageFromCurrentimageContext();    @H_404_17@UIGraphicsEndImageContext();    self.image = newPic;}

76、让label的文字内容显示在左上／右上／左下／右下／中心顶／中心底部

自定义UILabel// 重写label的textRectForBounds方法- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOflines:(NSInteger)numberOflines {    CGRect @H_404_17@rect = [super textRectForBounds:bounds limitedToNumberOflines:numberOflines];    switch (self.textAlignmentType) {        case WZBTextAlignmentTypelefttop: {            @H_404_17@rect.origin = bounds.origin;        }            break;        case WZBTextAlignmentTypeRighttop: {            @H_404_17@rect.origin = CGPointMake(CGRectGetMaxX(bounds) - @H_404_17@rect.@H_404_17@size.@H_404_17@wIDth,bounds.origin.y);        }            break;        case WZBTextAlignmentTypeleftBottom: {            @H_404_17@rect.origin = CGPointMake(bounds.origin.x,CGRectGetMaxY(bounds) - @H_404_17@rect.@H_404_17@size.@H_404_17@height);        }            break;        case WZBTextAlignmentTypeRightBottom: {            @H_404_17@rect.origin = CGPointMake(CGRectGetMaxX(bounds) - @H_404_17@rect.@H_404_17@size.@H_404_17@wIDth,CGRectGetMaxY(bounds) - @H_404_17@rect.@H_404_17@size.@H_404_17@height);        }            break;        case WZBTextAlignmentTypetopCenter: {            @H_404_17@rect.origin = CGPointMake((CGRectGetWIDth(bounds) - CGRectGetWIDth(@H_404_17@rect)) / 2,CGRectGetMaxY(bounds) - @H_404_17@rect.origin.y);        }            break;        case WZBTextAlignmentTypeBottomCenter: {            @H_404_17@rect.origin = CGPointMake((CGRectGetWIDth(bounds) - CGRectGetWIDth(@H_404_17@rect)) / 2,CGRectGetMaxY(bounds) - CGRectGetMaxY(bounds) - @H_404_17@rect.@H_404_17@size.@H_404_17@height);        }            break;        case WZBTextAlignmentTypeleft: {            @H_404_17@rect.origin = CGPointMake(0,@H_404_17@rect.origin.y);        }            break;        case WZBTextAlignmentTypeRight: {            @H_404_17@rect.origin = CGPointMake(@H_404_17@rect.origin.x,0);        }            break;        case WZBTextAlignmentTypeCenter: {            @H_404_17@rect.origin = CGPointMake((CGRectGetWIDth(bounds) - CGRectGetWIDth(@H_404_17@rect)) / 2,(CGRectGetHeight(bounds) - CGRectGetHeight(@H_404_17@rect)) / 2);        }            break;        default:            break;    }    return @H_404_17@rect;}- (voID)drawTextInRect:(CGRect)@H_404_17@rect {    CGRect textRect = [self textRectForBounds:@H_404_17@rect limitedToNumberOflines:self.numberOflines];    [super drawTextInRect:textRect];}

77、scrollVIEw上的输入框，键盘挡住的问题

推荐用IQKeyboardManager这个框架！手动解决如下1、监听键盘d出／消失的通知2、在通知中加入代码：@H_404_17@NSDictionary* info = [aNotification userInfo];@H_404_17@CGRect keyPadFrame=[[@H_404_17@UIApplication sharedApplication].keyWindow convertRect:[[info objectForKey:@H_404_17@UIKeyboardFrameBeginUserInfoKey] @H_404_17@CGRectValue] fromVIEw:self.vIEw];@H_404_17@CGSize kbSize =keyPadFrame.size;@H_404_17@CGRect activeRect=[self.vIEw convertRect:activeFIEld.frame fromVIEw:activeFIEld.supervIEw];@H_404_17@CGRect aRect = self.vIEw.bounds;aRect.size.height -= (kbSize.height);@H_404_17@CGPoint origin =  activeRect.origin;origin.y -= backScrollVIEw.contentOffset.y;if (!@H_404_17@CGRectContainsPoint(aRect,origin)) {    @H_404_17@CGPoint scrollPoint = @H_404_17@CGPointMake(0.0,@H_404_17@CGRectGetMaxY(activeRect)-(aRect.size.height));    [backScrollVIEw setContentOffset:scrollPoint animated:YES];}

78、frame布局的cell动态高度

这种通常在你的模型中添加一个辅助属性cellHeight，在模型中重写这个属性的get方法，根据你的布局和模型中的其他属性值计算出总高度。最后在tableVIEw：heightForRow方法中，根据indexPath找出对应的模型，返回这个高度即可。

79、autoLayout布局的cell动态高度

// 1、设置tableVIEw的属性self.tableVIEw.rowHeight = @H_404_17@UItableVIEwautomaticDimension;self.tableVIEw.estimatedRowHeight = 44.0; // 这个属性非0，估计cell高度

// 2、至上而下设置@H_404_17@cell的约束，注意，上下左右最好都要顶到@H_404_17@cell的四周

cell 80、使用performSelector:调用函数，内存泄漏问题

当我们在开发中使用[obj performSelector:NSSelectorFromString(@"aMethod")];这类方法时可能会收到一个警告"performSelector may cause a leak because its selector is unkNown".
是因为编译器不清楚这个对象能不能相应这个方法，如果不能，则是不安全的，而且编译器也不清楚该怎么处理这个方法的返回值！

使用以下代码调用即可：if (! obj) { return; }SEL selector = NSSelectorFromString(@"aMethod");IMP imp = [obj methodForSelector:selector];voID (*func)(ID,SEL) = (voID *)imp;func(obj,selector);或者：SEL selector = NSSelectorFromString(@"aMethod");((voID (*)(ID,SEL))[obj methodForSelector:selector])(obj,selector);

81、一个字符串是否包含另一个字符串

// 方法1if ([str1 containsstring:str2]) {        @H_404_17@NSLog(@"str1包含str2");    } else {        @H_404_17@NSLog(@"str1不包含str2");    }// 方法2if ([str1 rangeOfString: str2].location == @H_404_17@NSNotFound) {        @H_404_17@NSLog(@"str1不包含str2");    } else {        @H_404_17@NSLog(@"str1包含str2");    }

82、cell去除选中效果

cell.selectionStyle = UItableVIEwCellSelectionStyleNone;

83、cell点按效果

- (voID)tableVIEw:(UItableVIEw *)tableVIEw dIDSelectRowAtIndexPath:(NSIndexPath *)indexPath {    [tableVIEw deselectRowAtIndexPath:indexPath animated:YES];}

84、当删除一个从xib拖出来的属性时，一定记得把xib中对应的线也删掉，不然会报类似[<VIEwController 0x7fea6ed05980> setValue:forUndefinedKey:]: this class is not key value Coding-compliant for the key的crash

点击这个叉号删除 85、真机测试的时候报错：Could not launch "你的 App"，process launch Failed: Security

因为你的app没有上线，iOS9开始，需要手动信任Xcode生成的描述文件，打开手机设置->通用->描述文件->点击你的app的描述文件->点击信任

86、真机测试的时候报错：Could not find Developer disk Image

这是因为你的设备系统版本大于Xcode能兼容的系统版本，比如你的设备是iOS10.3，而Xcode版本是8.2（Xcode8.2最大兼容iOS10.2），就会报这个错误。解决办法就是升级Xcode！

87、UITextVIEw没有placeholder的问题？

网上有很多此类自定义控件，也可以参考下我写的一个UITextVIEw分类 UITextView-WZB

88、移除字符串中的空格和换行

+ (Nsstring *)removeSpaceAndNewline:(Nsstring *)str {    Nsstring *temp = [str stringByReplacingOccurrencesOfString:@" " withString:@""];    temp = [temp stringByReplacingOccurrencesOfString:@"\r" withString:@""];    temp = [temp stringByReplacingOccurrencesOfString:@"\n" withString:@""];    return temp;}

89、判断字符串中是否有空格

+ (@H_404_17@BOol)isBlank:(@H_404_17@Nsstring *)str {    @H_404_17@NSRange _range = [str rangeOfString:@" "];    if (_range.location != @H_404_17@NSNotFound) {        //有空格        return YES;    } else {        //没有空格        return NO;    }}

90、获取一个视频的第一帧图片

@H_404_17@NSURL *url = [@H_404_17@NSURL URLWithString:filepath];    @H_404_17@AVURLAsset *asset1 = [[@H_404_17@AVURLAsset alloc] initWithURL:url options:nil];    @H_404_17@AVAssetimageGenerator *generate1 = [[@H_404_17@AVAssetimageGenerator alloc] initWithAsset:asset1];    generate1.applIEsPreferredTracktransform = YES;    @H_404_17@NSError *err = NulL;    @H_404_17@CMTime time = @H_404_17@CMTimeMake(1,2);    @H_404_17@CGImageRef oneRef = [generate1 copyCGImageAtTime:time actualTime:NulL error:&err];    @H_404_17@UIImage *one = [[@H_404_17@UIImage alloc] initWithCGImage:oneRef];    return one;

91、获取视频的时长

+ (@H_404_17@NSInteger)getVIDeoTimeByUrlString:(@H_404_17@Nsstring *)urlString {    @H_404_17@NSURL *vIDeoUrl = [@H_404_17@NSURL URLWithString:urlString];    @H_404_17@AVURLAsset *avUrl = [@H_404_17@AVURLAsset assetWithURL:vIDeoUrl];    @H_404_17@CMTime time = [avUrl duration];    int seconds = ceil(time.value/time.timescale);    return seconds;}

92、字符串是否为空

+ (BOol)isEqualToNil:(Nsstring *)str {    return str.length <= 0 || [str isEqualToString:@""] || !str;}

93、将app上传到App Store的时候通常会遇到这个问题

try again

很多人说这事苹果爸爸服务器问题，重复尝试几次，总会成功的！
但是经过尝试发现如果使用Application Loader上传成功率就非常高，所以还是推荐把ipa文件导出直接用Application Loader上传。
如果Application Loader也不行，需要检查下自己的网络，有时候vpn也会提高速度。

94、当tableVIEw占不满一屏时，去除下边多余的单元格

self.@H_404_17@tableVIEw.@H_404_17@tableheaderVIEw = [UIVIEw new];self.@H_404_17@tableVIEw.@H_404_17@tableFooterVIEw = [UIVIEw new];

95、isKindOfClass和isMemberOfClass的区别

isKindOfClass可以判断某个对象是否属于某个类，或者这个类的子类。isMemberOfClass更加精准，它只能判断这个对象类型是否为这个类(不能判断子类)

96、__block

当一个局部变量需要在block里改变时，需要在定义时加上__block修饰，具体请看官方文档 http://developer.apple.com/library/ios/documentation/cocoa/Conceptual/Blocks/Articles/bxVariables.html#//apple_ref/doc/uid/TP40007502-CH6-SW6

97、-[VIEwController aMethod:]: unrecognized selector sent to instance 0x7fe91e607fb0

这是一个经典错误，VIEwController不能响应aMethod这个方法，错误原因可能vIEwController文件中没有实现aMethod这个方法

98、UItableVIEw (<UItableVIEw: 0x7ff19b027000; >) Failed to obtain a cell from its dataSource (<VIEwController: 0x7ff19a507520>)

这个错误原因是tableVIEw的代理方法-tableVIEw:cellForRowAtIndexPath:需要返回一个UItableVIEwCell,而你返回了一个nil。另外这个地方返回值不是UItableVIEwCell类型也会导致崩溃

99、约束如何做UIVIEw动画？

1、把需要改的约束Constraint拖条线出来，成为属性2、在需要动画的地方加入代码，改变此属性的constant属性3、开始做@H_404_17@UIVIEw动画，动画里边调用layoutIfNeeded方法@property (weak,nonatomic) IBOutlet @H_404_17@NSLayoutConstraint *buttontopConstraint;self.buttontopConstraint.constant = 100;    [@H_404_17@UIVIEw animateWithDuration:.5 animations:^{        [self.vIEw layoutIfNeeded];    }];

100、从NSURL中拿到链接字符串

Nsstring *urlString = myURL.absoluteString;

101、将tableVIEw滚动到顶部

[tableVIEw setContentOffset:CGPointZero animated:YES];或者[tableVIEw scrollRectToVisible:CGRectMake(0,1,1) animated:YES];

102、如果用addTarget:action:forControlEvents:方法为一个button添加了很多点击事件，在某个时刻想一次删除怎么办？只需要调用下边这句代码

[youbutton removeTarget:nil action:nil forControlEvents:UIControlEventAllEvents];

103、某个字体的高度

Font.lineHeight;

104、删除某个vIEw所有的子视图

[[someVIEw subvIEws] makeObjectsPerformSelector:@selector(removeFromSupervIEw)];

105、删除NSUserDefaults所有记录

//方法一  @H_404_17@Nsstring *appDomain = [[@H_404_17@NSBundle mainBundle] bundleIDentifIEr]; [[@H_404_17@NSUserDefaults standardUserDefaults] removePersistentDomainForname:appDomain];    //方法二 - (voID)resetDefaults {     @H_404_17@NSUserDefaults * defs = [@H_404_17@NSUserDefaults standardUserDefaults];     @H_404_17@NSDictionary * dict = [defs dictionaryRepresentation];     for (ID key in dict) {          [defs removeObjectForKey:key];     }      [defs synchronize]; }// 方法三[[@H_404_17@NSUserDefaults standardUserDefaults] setPersistentDomain:[@H_404_17@NSDictionary dictionary] forname:[[@H_404_17@NSBundle mainBundle] bundleIDentifIEr]];

106、禁用系统滑动返回功能

- (voID)vIEwDIDAppear:(@H_404_17@BOol)animated{     [super vIEwDIDAppear:animated];if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {self.navigationController.interactivePopGestureRecognizer.delegate = self;    }}- (voID)vIEwWilldisappear:(@H_404_17@BOol)animated {    [super vIEwWilldisappear:animated];    if ([self.navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {self.navigationController.interactivePopGestureRecognizer.delegate = nil;    }}- (@H_404_17@BOol)gestureRecognizerShouldBegin:(@H_404_17@UIGestureRecognizer *)gestureRecognizer{     return NO;}

107、模拟器报错

模拟器报错

解决办法：
打开模拟器->Simulator->reset Content and Settings...
如果不行，就重启试试！

108、自定义cell选中背景颜色

UIVIEw *@H_404_17@bgcolorVIEw = [[UIVIEw alloc] init];@H_404_17@bgcolorVIEw.backgroundcolor = [UIcolor redcolor];[cell @H_404_17@setSelectedBackgroundVIEw:@H_404_17@bgcolorVIEw];

109、UILabel设置内边距

子类化@H_404_17@UILabel，重写drawTextInRect方法- (voID)drawTextInRect:(@H_404_17@CGRect)rect {    // 边距，上左下右    @H_404_17@UIEdgeInsets insets = {0,5,5};    [super drawTextInRect:@H_404_17@UIEdgeInsetsInsetRect(rect,insets)];}

110、UILabel设置文字描边

子类化@H_404_17@UILabel，重写drawTextInRect方法- (voID)drawTextInRect:(@H_404_17@CGRect)rect{    @H_404_17@CGContextRef c = @H_404_17@UIGraphicsGetCurrentContext();    // 设置描边宽度    @H_404_17@CGContextSetlinewidth(c,1);    @H_404_17@CGContextSetlineJoin(c,kCGlineJoinRound);    @H_404_17@CGContextSetTextDrawingMode(c,kCGTextstroke);    // 描边颜色    self.textcolor = [@H_404_17@UIcolor redcolor];    [super drawTextInRect:rect];    // 文本颜色    self.textcolor = [@H_404_17@UIcolor yellowcolor];    @H_404_17@CGContextSetTextDrawingMode(c,kCGTextFill);    [super drawTextInRect:rect];}

111、使用模拟器截图

快捷键command + s
或者file->Save Screen Shot

112、scrollVIEw滚动到最下边

CGPoint bottomOffset = CGPointMake(0,scrollVIEw.contentSize.height - scrollVIEw.bounds.size.height); [scrollVIEw setContentOffset:bottomOffset animated:YES];

113、UIVIEw背景颜色渐变

@H_404_17@UIVIEw *vIEw = [[@H_404_17@UIVIEw alloc] initWithFrame:@H_404_17@CGRectMake(0,320,100)];    [self.vIEw addSubvIEw:vIEw];    @H_404_17@CAGradIEntLayer *gradIEnt = [@H_404_17@CAGradIEntLayer layer];    gradIEnt.frame = vIEw.bounds;    gradIEnt.colors = [@H_404_17@NSArray arrayWithObjects:(ID)[[@H_404_17@UIcolor blackcolor] @H_404_17@CGcolor],(ID)[[@H_404_17@UIcolor whitecolor] @H_404_17@CGcolor],nil];    [vIEw.layer insertSublayer:gradIEnt atIndex:0];

114、停止UIVIEw动画

[yourVIEw.layer removeAllAnimations]

115、为UIVIEw某个角添加圆角

// 左上角和右下角添加圆角@H_404_17@UIBezIErPath *maskPath = [@H_404_17@UIBezIErPath bezIErPathWithRoundedRect:vIEw.bounds byRoundingCorners:(@H_404_17@UIRectCornertopleft | @H_404_17@UIRectCornerBottomright) cornerRadii:@H_404_17@CGSizeMake(20,20)];    @H_404_17@CAShapeLayer *maskLayer = [@H_404_17@CAShapeLayer layer];    maskLayer.frame = vIEw.bounds;    maskLayer.path = maskPath.CGPath;    vIEw.layer.mask = maskLayer;

116、删除Xcode Derived data缓存数据

依次点击Xcode -> Preferences -> location，然后点击 Derived data路径后到小箭头，删除这个文件夹下的数据就可以了，如图

Xcode Derived data

117、将一个vIEw放置在其兄弟视图的最上面

[parentVIEw bringSubvIEwToFront:yourVIEw]

118、将一个vIEw放置在其兄弟视图的最下面

[parentVIEw sendSubvIEwToBack:yourVIEw]

119、让手机震动一下

倒入框架#import <AudioToolBox/AudioToolBox.h>AudioServicesPlayAlertSound(kSystemSoundID_Vibrate);或者AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);

120、layoutSubvIEws方法什么时候调用？

1、init方法不会调用
2、addSubvIEw方法等时候会调用
3、bounds改变的时候调用
4、scrollVIEw滚动的时候会调用scrollVIEw的layoutSubvIEws方法(所以不建议在scrollVIEw的layoutSubvIEws方法中做复杂逻辑)
5、旋转设备的时候调用
6、子视图被移除的时候调用
参考请看：http://blog.logichigh.com/2011/03/16/when-does-layoutsubviews-get-called/

121、让UILabel在指定的地方换行

// 换行符为\n,在需要换行的地方加上这个符号即可，如 label.numberOflines = 0; label.text = @"此处\n换行";

122、摇一摇功能

1、打开摇一摇功能    [@H_404_17@UIApplication sharedApplication].applicationSupportsShaketoEdit = YES;2、让需要摇动的控制器成为第一响应者[self becomeFirstResponder];3、实现以下方法// 开始摇动- (voID)motionBegan:(@H_404_17@UIEventSubtype)motion withEvent:(@H_404_17@UIEvent *)event// 取消摇动- (voID)motionCancelled:(@H_404_17@UIEventSubtype)motion withEvent:(@H_404_17@UIEvent *)event// 摇动结束- (voID)motionEnded:(@H_404_17@UIEventSubtype)motion withEvent:(@H_404_17@UIEvent *)event

123、获取图片大小

CGfloat imageWIDth = @H_404_17@image.@H_404_17@size.@H_404_17@wIDth;    CGfloat imageHeight = imageWIDth * @H_404_17@image.@H_404_17@scale;

124、获取vIEw的坐标在整个window上的位置

// v上的(0,0)点在toVIEw上的位置@H_404_17@CGPoint point = [v convertPoint:@H_404_17@CGPointMake(0,0) toVIEw:[@H_404_17@UIApplication sharedApplication].windows.lastObject];或者@H_404_17@CGPoint point = [v.supervIEw convertPoint:v.frame.origin toVIEw:[@H_404_17@UIApplication sharedApplication].windows.lastObject];

125、提交App Store审核程序限制

您的应用程序的未压缩大小必须小于4GB。每个Mach-O可执行文件（例如app_name.app/app_name）不能超过这些限制：
对于MinimumOsversion小于7.0的应用程序：TEXT二进制文件中所有部分的总数最多为80 MB 。
对于MinimumOsversion7.x到8.x的应用程序：TEXT对于二进制文件中每个体系结构片段的每个片段，最大为60 MB 。
对于MinimumOsversion9.0或更高版本的应用程序：__TEXT二进制文件中所有部分的总数最多为500 MB 。参阅：iTunes Connect开发者指南

126、修改UISegmentedControl的字体大小

[segment setTitleTextAttributes:@{NSFontAttributename : [UIFont systemFontOfSize:15.0f]} forState:UIControlStatenormal];

127、在非VIEwController的地方d出UIAlertController对话框

// 最好抽成一个分类@H_404_17@UIAlertController *alertController = [@H_404_17@UIAlertController alertControllerWithTitle:@"Title" message:@"message" preferredStyle:@H_404_17@UIAlertControllerStyleAlert];//...ID rootVIEwController = [@H_404_17@UIApplication sharedApplication].delegate.window.rootVIEwController;if([rootVIEwController isKindOfClass:[@H_404_17@UINavigationController class]]){    rootVIEwController = ((@H_404_17@UINavigationController *)rootVIEwController).vIEwControllers.firstObject;}if([rootVIEwController isKindOfClass:[@H_404_17@UITabbarController class]]){    rootVIEwController = ((@H_404_17@UITabbarController *)rootVIEwController).selectedVIEwController;}[rootVIEwController presentVIEwController:alertController animated:YES completion:nil];

128、获取一个vIEw所属的控制器

// vIEw分类方法- (@H_404_17@UIVIEwController *)belongVIEwController {    for (@H_404_17@UIVIEw *next = [self supervIEw]; next; next = next.supervIEw) {        @H_404_17@UIResponder* nextResponder = [next nextResponder];        if ([nextResponder isKindOfClass:[@H_404_17@UIVIEwController class]]) {            return (@H_404_17@UIVIEwController *)nextResponder;        }    }    return nil;}

129、UIImage和base64互转

// vIEw分类方法- (@H_404_17@Nsstring *)encodetoBase64String:(@H_404_17@UIImage *)image { return [@H_404_17@UIImagePNGRepresentation(image) base64EncodedStringWithOptions:@H_404_17@NSDataBase64EnCoding64CharacterlineLength];}- (@H_404_17@UIImage *)decodeBase64ToImage:(@H_404_17@Nsstring *)strEncodeData {  @H_404_17@NSData *data = [[@H_404_17@NSData alloc]initWithBase64EncodedString:strEncodeData options:@H_404_17@NSDataBase64DeCodingIgnoreUnkNownCharacters];  return [@H_404_17@UIImage imageWithData:data];}

130、UIWebVIEw设置背景透明

[webVIEw setBackgroundcolor:[UIcolor clearcolor]];[webVIEw setopaque:NO];

131、判断NSDate是不是今天

@H_404_17@NSDateComponents *otherDay = [[@H_404_17@NSCalendar currentCalendar] components:@H_404_17@NSCalendarUnitera | @H_404_17@NSCalendarUnitYear | @H_404_17@NSCalendarUnitMonth | @H_404_17@NSCalendarUnitDay fromDate:aDate];@H_404_17@NSDateComponents *today = [[@H_404_17@NSCalendar currentCalendar] components:@H_404_17@NSCalendarUnitera | @H_404_17@NSCalendarUnitYear | @H_404_17@NSCalendarUnitMonth | @H_404_17@NSCalendarUnitDay fromDate:[@H_404_17@NSDate date]];if([today day] == [otherDay day] &&   [today month] == [otherDay month] &&   [today year] == [otherDay year] &&   [today era] == [otherDay era]) {    // 是今天}

132、设置tableVIEw分割线颜色

[self.@H_404_17@tableVIEw @H_404_17@setSeparatorcolor:[UIcolor mycolor]];

133、设置屏幕方向

NSNumber *orIEntationTarget = [NSNumber numberWithInt:UIInterfaceOrIEntationLandscapeleft];[[UIDevice currentDevice] setValue:orIEntationTarget forKey:@"orIEntation"];[UIVIEwController attemptRotationToDeviceOrIEntation];

134、比较两个颜色是否相等

- (@H_404_17@BOol)isEqualTocolor:(@H_404_17@UIcolor *)othercolor {    @H_404_17@CGcolorSpaceRef colorSpaceRGB = @H_404_17@CGcolorSpaceCreateDeviceRGB();    @H_404_17@UIcolor *(^convertcolorToRGBSpace)(@H_404_17@UIcolor*) = ^(@H_404_17@UIcolor *color) {        if (@H_404_17@CGcolorSpaceGetModel(@H_404_17@CGcolorGetcolorSpace(color.CGcolor)) == kCGcolorSpaceModelMonoChrome) {            const @H_404_17@CGfloat *oldComponents = @H_404_17@CGcolorGetComponents(color.CGcolor);            @H_404_17@CGfloat components[4] = {oldComponents[0],oldComponents[0],oldComponents[1]};            @H_404_17@CGcolorRef colorRef = @H_404_17@CGcolorCreate( colorSpaceRGB,components );            @H_404_17@UIcolor *color = [@H_404_17@UIcolor colorWithCGcolor:colorRef];            @H_404_17@CGcolorRelease(colorRef);            return color;                    } else            return color;    };    @H_404_17@UIcolor *selfcolor = convertcolorToRGBSpace(self);    othercolor = convertcolorToRGBSpace(othercolor);    @H_404_17@CGcolorSpaceRelease(colorSpaceRGB);    return [selfcolor isEqual:othercolor];}

135、tableVIEwCell分割线顶到头

- (voID)tableVIEw:(@H_404_17@UItableVIEw *)tableVIEw willdisplayCell:(@H_404_17@UItableVIEwCell *)cell forRowAtIndexPath:(@H_404_17@NSIndexPath *)indexPath {    [cell setSeparatorInset:@H_404_17@UIEdgeInsetsZero];    [cell setLayoutmargins:@H_404_17@UIEdgeInsetsZero];    cell.preservesSupervIEwLayoutmargins = NO;}- (voID)vIEwDIDLayoutSubvIEws {    [self.tableVIEw setSeparatorInset:@H_404_17@UIEdgeInsetsZero];    [self.tableVIEw setLayoutmargins:@H_404_17@UIEdgeInsetsZero];}

136、不让控制器的vIEw随着控制器的xib拉伸或压缩

self.vIEw.autoresizingMask = @H_404_17@UIVIEwautoresizingFlexibleWIDth | @H_404_17@UIVIEwautoresizingFlexibleHeight;

137、cocoaPods报错 : [!] Unable to add a source with url https://github.com/CocoaPods/Specs.git named master-1.

You can try adding it manually in ~/.cocoapods/repos or via pod repo add.

解决方法：这是因为电脑里安装了另外一个Xcode导致cocoapods找不到路径了
在终端执行 sudo xcode-select -switch /Applications/Xcode.app 即可

138、安装cocoapods的时候出现 ERROR: While executing gem ... (Errno::EPERM)

Operation not permitted - /usr/bin/pod

解决办法：直接在终端执行 sudo gem install -n /usr/local/bin cocoapods

139、在状态栏增加网络请求的菊花，类似safari加载网页的时候状态栏菊花

[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;

140、检查一个rect是否包含一个point

// point是否在rect内BOol isContains = CGRectContainsPoint(@H_404_17@rect,@H_404_17@point);

141、在指定的宽度下，让UILabel自动设置最佳Font

label.adjustsFontSizetoFitWIDth = YES;

142、将一个image保存在相册中

@H_404_17@UIImageWritetoSavedPhotosAlbum(image,nil,nil);或者#import <Photos/Photos.h>[[PHPhotolibrary sharedPhotolibrary] performChanges:^{        PHAssetChangeRequest *changeRequest = [PHAssetChangeRequest creationRequestForAssetFromImage:image];        changeRequest.creationDate          = [@H_404_17@NSDate date];    } completionHandler:^(@H_404_17@BOol success,@H_404_17@NSError *error) {        if (success) {            @H_404_17@NSLog(@"successfully saved");        }        else {            @H_404_17@NSLog(@"error saving to photos: %@",error);        }    }];

143、修改cell.imageVIEw的大小

@H_404_17@UIImage *icon = [@H_404_17@UIImage imagenamed:@""];@H_404_17@CGSize itemSize = @H_404_17@CGSizeMake(30,30);@H_404_17@UIGraphicsBeginImageContextWithOptions(itemSize,0.0);@H_404_17@CGRect imageRect = @H_404_17@CGRectMake(0.0,0.0,itemSize.wIDth,itemSize.height);[icon drawInRect:imageRect];cell.imageVIEw.image = @H_404_17@UIGraphicsGetimageFromCurrentimageContext();@H_404_17@UIGraphicsEndImageContext();

144、为一个vIEw添加虚线边框

CAShapeLayer *border = [CAShapeLayer layer];    border.strokecolor = [UIcolor colorWithRed:67/255.0f green:37/255.0f blue:83/255.0f Alpha:1].CGcolor;    border.fillcolor = nil;    border.lineDashPattern = @[@4,@2];    border.path = [UIBezIErPath bezIErPathWithRect:vIEw.bounds].CGPath;     border.frame = vIEw.bounds;     [vIEw.layer addSublayer:border];

145、UITextVIEw中打开或禁用复制，剪切，选择，全选等功能

// 继承UITextVIEw重写这个方法- (BOol)canPerformAction:(SEL)action withSender:(ID)sender{// 返回NO为禁用，YES为开启    // 粘贴    if (action == @selector(@H_598_4195@paste:)) return NO;    // 剪切    if (action == @selector(@H_598_4195@cut:)) return NO;    // 复制    if (action == @selector(@H_598_4195@copy:)) return NO;    // 选择    if (action == @selector(@H_598_4195@select:)) return NO;    // 选中全部    if (action == @selector(@H_598_4195@selectAll:)) return NO;    // 删除    if (action == @selector(@H_598_4195@delete:)) return NO;    // 分享    if (action == @selector(share)) return NO;    return [super canPerformAction:action withSender:sender];}