Question

我在NavigationController中遇到了我的UITableView问题。当我向表中添加数据时，我使用另一个类下载图像以显示在该表中，而所有这些都很有效，但如果在图像中间下载，我会回到导航控制器应用程序中的上一个视图崩溃。

这是我的代码进一步解释

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    // Set appIcon and clear temporary data/image
    UIImage *image = [[UIImage alloc] initWithData:self.activeDownload];
    UIImage *appIcon;

    if (image.size.width != kAppIconHeight && image.size.height != kAppIconHeight)
    {
        CGSize itemSize = CGSizeMake(125, 85);
        UIGraphicsBeginImageContext(itemSize);
        CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
        [image drawInRect:imageRect];
        appIcon = UIGraphicsGetImageFromCurrentImageContext();
        ///UIGraphicsEndImageContext();
    }
    else
    {
        appIcon = image;
        //self.appRecord.appIcon = image;
    }

    self.activeDownload = nil;


    // Release the connection now that it's finished
    self.imageConnection = nil;

    // call our delegate and tell it that our icon is ready for display
    if(delegate != nil)
    [delegate appImageDidLoad:self.indexPathInTableView imaged:appIcon ];

 [image release];

}

appImageDidLoad是我的UITableView视图中存在的方法。

有没有办法可以检查UITableView是否在我的imagedownload类中有效，所以我知道不发送图像。

提前致谢。

Answer 1

崩溃是由于代表在图像准备好之前获得释放！

在ViewWillDisappear

中试试

// terminate all pending download connections
NSArray *allDownloads = [self.imageDownloadsInProgress allValues];
[allDownloads performSelector:@selector(cancelDownload)];

Answer 2

这是此次崩溃的解决方案。

-(void)viewDidDisappear:(BOOL)animated 
{
    [super viewDidDisappear:animated];

    // terminate all pending download connections

    NSArray *allDownloads = [self.imageDownloadsInProgress1 allValues];

    [allDownloads makeObjectsPerformSelector:@selector(cancelDownload)];

}

如何检查视图是否有效iphone

2 个答案: