从superview中删除UIImageView后未释放内存(Memory not released after removing UIImageView from superview)

 在iOS 6.1上，我有一个带有scrollView的视图控制器，当用户在页面中轻弹时，我需要显示一些图像。 scrollView有3个子视图，分别显示当前图像，上一图像和下一图像。 在滚动期间替换图像。 该机制工作正常，但资源未按预期释放，并且在滚动大约15个图像后终止应用程序。 
 
 起初我尝试解决问题只是将新图像分配给UIImageView，但它不起作用（我读到图像被缓存），所以我尝试了一种不同的方法： 
 
// access the UIImageView of the currentView
for (UIView *subviewOfCurrentView in [currentView subviews]) {
    if ([subviewOfCurrentView isKindOfClass:[UIImageView class]]) {
        UIImageView *cv = (UIImageView *)subviewOfCurrentView;
        //cv.image = nil;
        [cv removeFromSuperview];
        UIImageView *new_cv = [[UIImageView alloc] initWithFrame:photoRect];
        new_cv.image = [UIImage imageNamed:[myObject getFileName];
        [currentView addSubview:new_cv];

    }
}
 
 使用活动监视器对应用程序进行概要分析表明，当我轻弹图像时，实际内存使用量会持续增长，尽管子视图的数量保持不变。 
 
 请注意，应用程序终止而不调用didReceiveMemoryWarning。 
 
 如何强制我的应用程序释放UIImage（s）和UIImageView（s）使用的内存？ 
 
 如果你能帮助我，非常感谢。 

On iOS 6.1, I have a view controller with a scrollView in which I need to display some images as the user flicks through the pages. The scrollView has 3 subviews to display the current, the previous and the next image respectively. Images are substituted during the scrolling. The mechanism works fine, but resources are not released as expected and the app is terminated after scrolling approximately 15 images.
 
At first I tried solving the problem simply assigning the new image to the UIImageView, but it did not work (I read that images are cached), so I tried a different approach:
 
// access the UIImageView of the currentView
for (UIView *subviewOfCurrentView in [currentView subviews]) {
    if ([subviewOfCurrentView isKindOfClass:[UIImageView class]]) {
        UIImageView *cv = (UIImageView *)subviewOfCurrentView;
        //cv.image = nil;
        [cv removeFromSuperview];
        UIImageView *new_cv = [[UIImageView alloc] initWithFrame:photoRect];
        new_cv.image = [UIImage imageNamed:[myObject getFileName];
        [currentView addSubview:new_cv];

    }
}
 
Profiling the app with the Activity Monitor shows that the Real Memory Usage keeps growing when I flick an image, despite the fact that the number of subviews remains constant.
 
Note that the app is terminated without calling didReceiveMemoryWarning.
 
How can I force my app to release the memory used by UIImage(s) and UIImageView(s)?
 
If you can help me, much appreciated.

原文：https://stackoverflow.com/questions/18893455