UIImageView + AFNetworking类别与UIActivityIndi​​catorView参考内存保留？

Question

我试图通过淡入淡出和UIImageView来实现类别以显示来自网址的UIActivityIndicatorView，我在网上找到了一些内容并且我已经在最终版本中进行了编辑：

的UIImageView + AFNetworkingLoad.m

@implementation UIImageView (AFNetworkingLoad)

- (void)setImageWithURL:(NSURL *)url placeholderImage:(UIImage *)placeholderImage fadeInWithDuration:(CGFloat)duration withLoadIndicator:(UIActivityIndicatorView *)load_indicator {

    [load_indicator startAnimating];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
    [request setHTTPShouldHandleCookies:NO];
    [request addValue:@"image/*" forHTTPHeaderField:@"Accept"];

    __weak typeof (self) weakSelf = self;

    [self setImageWithURLRequest:request placeholderImage:placeholderImage success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
        [load_indicator stopAnimating];
        if (!request) // image was cached
            [weakSelf setImage:image];
        else
            [UIView transitionWithView:weakSelf duration:duration options:UIViewAnimationOptionTransitionCrossDissolve animations:^{
                [weakSelf setImage:image];
            } completion:nil];
    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
        [load_indicator stopAnimating];
    }];
}

然后我以这种方式在自定义UITableViewCell中使用它：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
MyCell *cell = (MyCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
...
[cell.img_view setImageWithURL:[NSURL URLWithString:my_url] placeholderImage:nil fadeInWithDuration:0.3 withLoadIndicator:cell.load_img];
...
}

一切正常，现在我的问题是，通过这个实现传递UIActivityIndi​​catorView的引用，我可以有一些内存泄漏吗？还是保留问题？显然我在我的iOS项目中使用ARC ......

Answer 1

此类别不应导致内存泄漏。该方法将对象传递给复制块，因此临时保留该块，但是一旦图像加载或加载失败，就应该清除块，这会丢弃对象的保留计数。