Question

在我的应用程序中，我使用一个名为ThumbDownloader

的类实现延迟加载

要开始图像下载，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类在下载完图像后，调用我的主类（listingView）中的一个名为：

的方法

- (void)appImageDidLoad:(NSIndexPath *)indexPath

问题是，如果我输入listingView并在下载图片时快速离开，应用程序会崩溃：

-[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，将其委托设置为nil，但是当我尝试它也崩溃时......就像这样：

- (void)dealloc
{

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

    .....

Answer 1

如果您将该代码用于UIImageView的设置图像，则应尝试使用AFNetworking框架中的"UIImageView+AFNetworking.h"类别来解决此问题。您只需设置[image setImageWithUrl:@"http://myImage"];

即可

iOS委托崩溃

1 个答案: