ios – 当我在滚动UITableview期间显示文档目录中的图像时,内存不断增加然后应用程序崩溃

概述我的要求是下载应用程序内存中的所有图像,如果可用,则从本地显示. 下面是我从本地访问图像的代码,如果它不可用,那么它将下载然后显示. [cell.imgProfilePic processImageDataWithURLString:cData.PICTURE]; 我已经制作了自定义UIImageView类 DImageView.h #import <UIKit/UIKit.h> @int 我的要求是下载应用程序内存中的所有图像,如果可用,则从本地显示.

下面是我从本地访问图像的代码,如果它不可用,那么它将下载然后显示.

[cell.imgProfilePic processImageDataWithURLString:cdata.PICTURE];

我已经制作了自定义UIImageVIEw类

DImageVIEw.h

#import <UIKit/UIKit.h>    @interface DImageVIEw : UIImageVIEw    @property (nonatomic,strong) UIActivityIndicatorVIEw *activityVIEw;    - (voID)processImageDataWithURLString:(Nsstring *)urlString;    + (UIImage *)getSavedImage :(Nsstring *)filename;    @end

DImageVIEw.m

#import "DImageVIEw.h"#define IMAGES_FolDER_name  @"DImages"@implementation DImageVIEw- (ID)initWithFrame:(CGRect)frame{    self = [super initWithFrame:frame];    if (self)    {    }    return self;}- (voID)dealloc{    self.activityVIEw = nil;    [super dealloc];}- (ID)initWithCoder:(NSCoder *)aDecoder{    self = [super initWithCoder:aDecoder];    if (self)    {        [self initWithFrame:[self frame]];    }    return self;}- (voID)processImageDataWithURLString:(Nsstring *)urlString{    @autoreleasepool    {    UIImage * saveimg =[DImageVIEw getSavedImage:urlString];    if (saveimg)    {        @autoreleasepool        {        dispatch_queue_t callerQueue = dispatch_get_main_queue();        dispatch_async(callerQueue,^{            @autoreleasepool{            [self setimage:saveimg];            }        });    }    }    else    {        [self showActivityIndicator];        NSURL *url = [NSURL URLWithString:[urlString stringByAddingPercentEscapesUsingEnCoding:NSUTF8StringEnCoding]];        dispatch_queue_t callerQueue = dispatch_get_main_queue();        dispatch_queue_t downloadQueue = dispatch_get_global_queue(disPATCH_QUEUE_PRIORITY_HIGH,0);        __block NSError* error = nil;        dispatch_async(downloadQueue,^{            @autoreleasepool            {                NSData * imageData = [NSData dataWithContentsOfURL:url options:NSDataReadingUncached error:&error];                if (!error)                {                    dispatch_async(callerQueue,^{                        @autoreleasepool {                        UIImage *image = [UIImage imageWithData:imageData];                        [self setimage:image];                        [self hIDeActivityIndicator];                        [self saveImageWithFoldername:IMAGES_FolDER_name Andfilename:urlString AndImage:imageData];                        }                    });                }            }        });        dispatch_release(downloadQueue);    }    }}- (voID) showActivityIndicator{    self.activityVIEw = [[UIActivityIndicatorVIEw alloc]initWithFrame:CGRectMake(0,self.frame.size.wIDth,self.frame.size.height)];    self.activityVIEw.autoresizingMask = UIVIEwautoresizingFlexibleleftmargin | UIVIEwautoresizingFlexibletopmargin | UIVIEwautoresizingFlexibleRightmargin | UIVIEwautoresizingFlexibleBottommargin;    self.activityVIEw.hIDesWhenStopped = TRUE;    self.activityVIEw.backgroundcolor = [UIcolor clearcolor];    self.activityVIEw.activityIndicatorVIEwStyle = UIActivityIndicatorVIEwStyleGray;    [self addSubvIEw:self.activityVIEw];    [self.activityVIEw startAnimating];}- (voID) hIDeActivityIndicator{    CAAnimation *animation = [NSClassFromString(@"CATransition") animation];    [animation setValue:@"kCATransitionFade" forKey:@"type"];    animation.duration = 0.4;;    [self.layer addAnimation:animation forKey:nil];    [self.activityVIEw stopAnimating];    [self.activityVIEw removeFromSupervIEw];    for (UIVIEw * vIEw in self.subvIEws)    {        if([vIEw isKindOfClass:[UIActivityIndicatorVIEw class]])            [vIEw removeFromSupervIEw];    }}- (voID)saveImageWithFoldername:(Nsstring *)foldername Andfilename:(Nsstring *)filename AndImage:(NSData *) imageData{    @autoreleasepool{    NSfileManager *filemanger = [[NSfileManager defaultManager] autorelease];    Nsstring *directoryPath =  [[Nsstring stringWithFormat:@"%@/%@",[DImageVIEw  applicationdocumentsDirectory],foldername] autorelease];    if (![filemanger fileExistsAtPath:directoryPath])    {        NSError *error = nil;        [filemanger createDirectoryAtPath:directoryPath withIntermediateDirectorIEs:YES attributes:nil error:&error];    }    filename = [DImageVIEw filenameValIDate:filename];    Nsstring *filePath = [[Nsstring stringWithFormat:@"%@/%@",directoryPath,filename] autorelease];    BOol isSaved = [imageData writetofile:filePath atomically:YES];    if (!isSaved)DLog(@" ** img Not Saved");    }}+ (Nsstring *)applicationdocumentsDirectory{    NSArray *paths = NSSearchPathForDirectorIEsInDomains(NSdocumentDirectory,NSUserDomainMask,YES);    Nsstring *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil;    return basePath;}+ (UIImage *)getSavedImage :(Nsstring *)filename{    NSautoreleasePool* pool = [[NSautoreleasePool alloc] init];    filename = [DImageVIEw filenameValIDate:filename];    NSfileManager * filemanger = [[NSfileManager defaultManager] autorelease];    Nsstring * directoryPath =  [[Nsstring stringWithFormat:@"%@/%@",[DImageVIEw applicationdocumentsDirectory],IMAGES_FolDER_name] autorelease];    Nsstring * filePath = [[Nsstring stringWithFormat:@"%@/%@",filename] autorelease];    if ([filemanger fileExistsAtPath:directoryPath])    {        UIImage *image = [[[UIImage imageWithContentsOffile:filePath] retain]autorelease];        if (image)            return image;        else            return nil;    }    [pool release];    return nil;}+ (Nsstring*) filenameValIDate : (Nsstring*) name{    name = [name stringByReplacingOccurrencesOfString:@"://" withString:@"##"];    name = [name stringByReplacingOccurrencesOfString:@"/" withString:@"#"];    name = [name stringByReplacingOccurrencesOfString:@"%20" withString:@""];    return name;}@end

一切正常,平滑滚动以及后台的asyncImage下载.

问题是当我滚动UItablevIEw时,应用程序内存不断增加,经过一段时间后,我得到了接收内存2/3时间然后应用程序崩溃.

当我使用AsyncImageVIEw类时,内存不会增加并且其工作正常.但由于应用程序的要求,我将所有图像保存到文档目录,并在其可用时显示.

我已尝试使用@autoreleasepool并发布一些变量但未获得成功.

我很感激,如果有人有解决方案来管理内存管理.

**ARC is off in my application.**

解决方法 UIImagePNGRepresentation可能会返回非自动释放的对象 – 您可以尝试释放它并查看是否会导致崩溃.显然你没有发布一些东西,但除了图像表示之外别无其他.

其他一些评论：

>使用ObjectAlloc工具在Instruments中运行您的应用程序,并且应该立即明确哪些对象未被释放.如果您不了解乐器,那么现在是时候学习它了.
>你可以’跟踪’对象并在使用ObjectTracker解除分配时收到消息 – 但是它是为ARC设计的,所以你可能需要调整它.如果您使用它,您将在每个对象被释放时看到一条消息
>当表格视图使用单元格完成时,您可以接收一个委托方法,告诉您,然后您可以将单元格保留为nil(释放)和对象
>你对downloadQueue的使用是奇怪的 – 在你的实例中创建一次作为ivar,根据需要使用它,并在dealloc发布它
>您隐藏主队列上的活动微调器,但不要在主队列上启动它
>您命令活动视图从超级视图中删除自己,但随后在子视图中查找并尝试将其删除：

[self.activityVIEw removeFromSupervIEw];

for (UIVIEw * vIEw in self.subvIEws){    if([vIEw isKindOfClass:[UIActivityIndicatorVIEw class]])        [vIEw removeFromSupervIEw];}

最后,仪器就是你想要的.你可以在这里阅读更多关于它的信息,或者只是谷歌,你肯定会找到一大堆博客来阅读.

总结

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