ios - iOS代表当机

在我的应用中，我正在使用名为ThumbDownloader的类实现延迟加载

要开始下载图像，我的UITableView cellForRowAtIndexPath方法调用此方法:

- (void)startIconDownload:(Product *)product forIndexPath:(NSIndexPath *)indexPath
{
    ThumbDownloader *thumbDownloader = [imageDownloadsInProgress objectForKey:indexPath];
    if (thumbDownloader == nil)
    {
        thumbDownloader = [[ThumbDownloader alloc] init];
        thumbDownloader.product = product;
        thumbDownloader.imageSizeWidth = 87;
        thumbDownloader.imageSizeHeight = 87;
        thumbDownloader.indexPathInTableView = indexPath;
        thumbDownloader.delegate = self;
        [imageDownloadsInProgress setObject:thumbDownloader forKey:indexPath];
        [thumbDownloader startDownload];
        [thumbDownloader release];
    }
}

thumbdownloader类下载完图像后，将在我的主类(listingView)中调用一个方法，该方法称为:

- (void)appImageDidLoad:(NSIndexPath *)indexPath

问题是，如果我进入listingView并在下载图像时迅速离开，则该应用程序崩溃并显示:

-[listingView appImageDidLoad:]: message sent to deallocated instance 0x3beed10

这是我的dealloc

- (void)dealloc
{
    [myTable release], myTable = nil;
    [imageDownloadsInProgress release], imageDownloadsInProgress = nil;
    [spinView release], spinView = nil;
    [mainView release], mainView = nil;
    [tableView release], tableView = nil;

    [myVs release], myVs = nil;
    [filteredVs release], filteredVs = nil;
    [toolBar release], toolBar = nil;

    [super dealloc];
}

我试图遍历imageDownloadsInProgress中的Thumbdownloader实例以将其委托(delegate)设置为nil，但是当我尝试使其崩溃时，也是如此……

- (void)dealloc
{

    for(ThumbDownloader *thumbDownloader in imageDownloadsInProgress)
        if(thumbDownloader !=nil && thumbDownloader.delegate!=nil)
            thumbDownloader.delegate = nil;

    .....

最佳答案

如果使用该代码将图像设置为UIImageView，则应尝试使用AFNetworking框架中的"UIImageView+AFNetworking.h"类别来解决此问题。您只需要设置[image setImageWithUrl:@"http://myImage"];

关于ios - iOS代表当机，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/12640950/