iOS tableView实现头部拉伸并改变导航条渐变色

概述iOS tableView实现头部拉伸并改变导航条渐变色 本文实例为大家分享了iOS tableView实现头部拉伸改变,导航条渐变色的具体代码,供大家参考,具体内容如下 #import "TableViewController.h" static NSString *ident = @"cell"; #define RGBA(r,g,b,a) [UIColor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f alpha:a] #define RGB(r,g, ...

本文实例为大家分享了iOS tableVIEw实现头部拉伸改变，导航条渐变色的具体代码，供大家参考，具体内容如下

#import "tableVIEwController.h"static Nsstring *IDent = @"cell";#define RGBA(r,g,b,a) [UIcolor colorWithRed:r/255.0f green:g/255.0f blue:b/255.0f Alpha:a]#define RGB(r,b) RGBA(r,1.0f)#define ZhuTicolor RGB(76,16,198)#define ZhuTicolorAlpha(Alpha) RGBA(76,198,Alpha)// 判断是否是iPhone X#define iPhoneX ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1125,2436),[[UIScreen mainScreen] currentMode].size) : NO)// 状态栏高度#define STATUS_bar_HEIGHT (iPhoneX ? 44.f : 20.f)// 导航栏高度#define NAVIGATION_bar_HEIGHT (iPhoneX ? 88.f : 64.f)// tabbar高度#define TAB_bar_HEIGHT (iPhoneX ? (49.f + 34.f) : 49.f)// home indicator#define HOME_INDICATOR_HEIGHT (iPhoneX ? 34.f : 0.f)#define ScreenWIDth ([UIScreen mainScreen].bounds.size.wIDth)#define ScreenHeight ([UIScreen mainScreen].bounds.size.height)#define imageHight 200@interface tableVIEwController ()@property (nonatomic,strong) UIImageVIEw *headImage;@property (nonatomic,strong) UIVIEw *headerBackVIEw;@property (nonatomic,strong) UIVIEw *mengVIEw;@end@implementation tableVIEwController- (voID)vIEwDIDLoad {  [super vIEwDIDLoad];  [self.tableVIEw registerClass:[UItableVIEwCell class] forCellReuseIDentifIEr:IDent];  self.vIEw.backgroundcolor = [UIcolor redcolor];  self.tableVIEw.tableheaderVIEw = self.headerBackVIEw;  [self.headerBackVIEw addSubvIEw:self.headImage];  [self.headImage addSubvIEw:self.mengVIEw];  [self navCleanFromAlpha:0];}-(voID)navCleanFromAlpha:(CGfloat)Alpha{  [self.navigationController.navigationbar setBackgroundImage:[self createImageWithcolor:ZhuTicolorAlpha(Alpha)] forbarMetrics:UIbarMetricsDefault];  self.navigationController.navigationbar.shadowImage = [UIImage new];}-(UIImage*) createImageWithcolor:(UIcolor*) color{  CGRect rect=CGRectMake(0.0f,0.0f,1.0f,1.0f);  UIGraphicsBeginImageContext(rect.size);  CGContextRef context = UIGraphicsGetCurrentContext();  CGContextSetFillcolorWithcolor(context,[color CGcolor]);  CGContextFillRect(context,rect);  UIImage *theImage = UIGraphicsGetimageFromCurrentimageContext();  UIGraphicsEndImageContext();  return theImage;}-(UIImageVIEw *)headImage{  if(!_headImage)  {    _headImage= [[UIImageVIEw alloc]initWithFrame: self.headerBackVIEw.bounds];    _headImage.image = [UIImage imagenamed:@"1024"];  }  return _headImage;}-(UIVIEw *)mengVIEw{  if (!_mengVIEw)  {    _mengVIEw = [[UIVIEw alloc]initWithFrame:self.headerBackVIEw.bounds];    _mengVIEw.backgroundcolor = RGBA(1,1,0.1);  }  return _mengVIEw;}-(UIVIEw *)headerBackVIEw{  if (!_headerBackVIEw)  {    _headerBackVIEw = [[UIVIEw alloc] initWithFrame:CGRectMake(0,ScreenWIDth,imageHight)];    [_headerBackVIEw setBackgroundcolor:[UIcolor lightGraycolor]];  }  return _headerBackVIEw;}- (voID)dIDReceiveMemoryWarning {  [super dIDReceiveMemoryWarning];  // dispose of any resources that can be recreated.}- (voID)scrollVIEwDIDScroll:(UIScrollVIEw *)scrollVIEw{  //---------------------- 图片拉升 -------------------------  //图片高度  CGfloat imageHeight = self.headerBackVIEw.frame.size.height;  //图片宽度  CGfloat imageWIDth = ScreenWIDth;  //图片上下偏移量  CGfloat imageOffsetY = scrollVIEw.contentOffset.y;//  NSLog(@"图片上下偏移量 imageOffsetY:%f ->",imageOffsetY);  //上移  if (imageOffsetY < 0)  {    CGfloat totalOffset = imageHeight + ABS(imageOffsetY);    CGfloat f = totalOffset / imageHeight;    self.headImage.frame = CGRectMake(-(imageWIDth * f - imageWIDth) * 0.5,imageOffsetY,imageWIDth * f,totalOffset);    self.mengVIEw.frame = self.headImage.bounds;  }  //------------------- 导航条颜色渐变 ----------------------------  CGfloat tableVIEwOffsetY = [self.tableVIEw rectForSection:0].origin.y - NAVIGATION_bar_HEIGHT;  CGfloat contentOffsetY = scrollVIEw.contentOffset.y;  if (contentOffsetY >= tableVIEwOffsetY)  {//    scrollVIEw.contentOffset = CGPointMake(0,tableVIEwOffsetY); //定位    [self navCleanFromAlpha:1];  }  else  {    CGfloat Alpha = scrollVIEw.contentOffset.y/imageHight;    if (Alpha >= 1) { Alpha = 1; }    if (Alpha <= 0) { Alpha = 0; }    NSLog(@"%.2f",Alpha);    [self navCleanFromAlpha:Alpha];  }}- (NSInteger)tableVIEw:(UItableVIEw *)tableVIEw numberOfRowsInSection:(NSInteger)section {  return 20;}- (UItableVIEwCell *)tableVIEw:(UItableVIEw *)tableVIEw cellForRowAtIndexPath:(NSIndexPath *)indexPath {  UItableVIEwCell *cell = [tableVIEw dequeueReusableCellWithIDentifIEr:IDent forIndexPath:indexPath];  // Configure the cell...  cell.textLabel.text = [Nsstring stringWithFormat:@"asdada = %zd",indexPath.row];  return cell;}

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