UIButton的子视图需要释放吗？
第一次在这里提问。
我有一个问题，我有一个 UIImageView 作为子视图添加到我的 UIButton 中，它是使用 buttonWithType: 声明的（这意味着我不'不必释放按钮吗？）但是我仍然需要释放 UIButton 的子视图吗？
代码位：
UIImage *circleImage = [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @"item-circle" ofType: @"png"]];
UIImageView *circleImageView = [[[UIImageView alloc] initWithImage: circleImage] autorelease];
[imageView setFrame: CGRectMake(-5, -5, 65, 65)];
UIButton *button = [UIButton buttonWithType: UIButtonTypeCustom];
[button addSubview: circleImageView];
First time asking a question here.
I have a question, I have a UIImageView added as a subview to my UIButton, which is declared using buttonWithType: (which means I don't have to release the button right?) But do I still have to release the subview of my UIButton?
Code bits:
UIImage *circleImage = [UIImage imageWithContentsOfFile: [[NSBundle mainBundle] pathForResource: @"item-circle" ofType: @"png"]];
UIImageView *circleImageView = [[[UIImageView alloc] initWithImage: circleImage] autorelease];
[imageView setFrame: CGRectMake(-5, -5, 65, 65)];
UIButton *button = [UIButton buttonWithType: UIButtonTypeCustom];
[button addSubview: circleImageView];
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简短回答：
您的代码看起来不错。基本的经验法则是，对于每个
alloc、new、retain或copy，您都需要一个 <代码>释放或<代码>自动释放。长答案：
让我们逐行浏览您的代码。
第一行使用了一种便捷方法。您不需要对任何内容调用release，因为您还没有调用
alloc、new、retain或copy< /代码>。在第二行中，您调用了
alloc，但随后调用了autoerelease，因此您的情况很好。同样，没有
alloc、new、retain或copy。您再次使用了一种便捷方法。
您还没有调用
alloc、new、retain或copy。因此，您不需要调用release或autorelease。Short Answer:
Your code seems fine. The basic rule of thumb is that for every
alloc,new,retain, orcopy, you need areleaseorautorelease.Long Answer:
Let's go through your code line by line.
This first line uses a convenience method. you don't need to call release on anything, since you haven't called
alloc,new,retain, orcopy.In the second line, you call
alloc, but you then callautoerelease, so you're good there.Again, no
alloc,new,retain, orcopy.Once again, you've used a convenience method.
You still haven't called
alloc,new,retain, orcopy. Therefore, you don't callreleaseorautorelease.作为一般规则，您自己
分配或保留的任何内容都需要释放。但您在这里（本质上）是通过调用 autorelease 来做到这一点的。如果你问是否需要再次释放子视图，答案是否定的。这同样适用于您的按钮。您尚未调用
alloc或retain（而是使用buttonWithType），因此无需调用release代码>就可以了。As a general rule, anything you
allocorretainyourself will need to be released. But you are doing that here (in essence) by callingautorelease. If you're asking whether or not you need to release the subview again, the answer is no.The same applies to your button. You haven't called
allocorretain(instead you usedbuttonWithType), so you don't need to callreleaseon it.