Question

此代码中显示的图像正在泄漏，但我无法弄清楚如何。我有一个显示要显示的图像的tableview。每次用户选择图像时，它应删除旧图像，下载新图像，然后将其添加到滚动视图。但旧图像没有被释放，我无法弄清楚为什么......

-(void)tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [imageView removeFromSuperview];
    self.imageView = nil;
    NSUInteger row = [indexPath row];

    NSString *tempC = [[NSString alloc]initWithFormat:@"http://www.website.com/%@_0001.jpg",[pdfNamesFinalArray objectAtIndex:row] ];
    chartFileName = tempC;
    pdfName = [pdfNamesFinalArray objectAtIndex:row];

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    NSArray* paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
                                                         NSUserDomainMask, YES);
    NSString *docsPath = [paths objectAtIndex:0];
    NSString *tempString = [[[NSString alloc]initWithFormat:@"%@/%@.jpg",docsPath,pdfName]autorelease];
    NSData *data = [NSData dataWithContentsOfFile:tempString];

    if (data != NULL){
        self.imageView = nil;
        [imageView removeFromSuperview];
        self.imageView = nil;
        UIImageView *tempImage = [[[UIImageView alloc]initWithImage:[UIImage imageWithData:data]]autorelease];
        self.imageView = tempImage;
        [data release];
        scrollView.contentSize = CGSizeMake(imageView.frame.size.width , imageView.frame.size.height);
        scrollView.maximumZoomScale = 1;
        scrollView.minimumZoomScale = .6;

        scrollView.clipsToBounds = YES;
        scrollView.delegate = self;

        [scrollView addSubview:imageView];
        scrollView.zoomScale = .37;

    }

    else {
        [data release];
        self.imageView = nil;
        [imageView removeFromSuperview];
        self.imageView = nil;
        activityIndicator.hidden = NO;
        getChartsButton.enabled = NO;
        chartListButton.enabled = NO;
        saveChartButton.enabled = NO;
        [NSThread detachNewThreadSelector:@selector(downloadImages) toTarget:self withObject:nil];



    }
chartPanel.hidden = YES;



}

-(void) downloadImages {

    NSAutoreleasePool* pool = [[NSAutoreleasePool alloc] init];
    self.imageView = nil;
    [imageView removeFromSuperview];
    NSURL *url = [[[NSURL alloc]initWithString:chartFileName]autorelease];
    NSData *data = [NSData dataWithContentsOfURL:url];

    UIImageView *tempImage = [[[UIImageView alloc]initWithImage:[UIImage imageWithData:data]]autorelease];
    self.imageView = tempImage;
    tempImage = nil;

    scrollView.contentSize = CGSizeMake(imageView.frame.size.width , imageView.frame.size.height);
    scrollView.maximumZoomScale = 1;
    scrollView.minimumZoomScale = .37;
    scrollView.clipsToBounds = YES;
    scrollView.delegate = self;
    [scrollView addSubview:imageView];
    scrollView.zoomScale = .6;

    activityIndicator.hidden = YES;
    getChartsButton.enabled = YES;
    chartListButton.enabled = YES;
    saveChartButton.enabled = YES;
    [pool drain];
    [pool release];
}

Answer 1

这看起来不对：

self.imageView = nil;
[imageView removeFromSuperview];

在将<{em}>从中删除之前，你将imageView设置为nil ，因此第二个语句实际上只是[nil removeFromSuperview];，它不会做任何事情。< / p>

Answer 2

我认为泄漏是David Gelhar所说的，但我只想补充一点，你不应该从主线程以外的线程访问UI内容（例如，不要在{1}下执行单独的线程）。这可能会导致非常奇怪的问题，包括神秘的泄漏。尝试将所有内容放在您使用[imageView removeFromSuperview]调用的主线程上的单独方法中，并查看它是否仍然泄漏。

另外（虽然这不会导致泄漏），[self performSelectorOnMainThread:]会释放自动释放池，所以你不应该在它之后调用[pool drain] - 它可能会释放主线程上的池，可能会在某个地方造成崩溃（因为你可能会过度释放游泳池）。

iPhone图像泄漏，但在哪里？

2 个答案: