在后台线程上加载笔尖
我刚刚花了一天时间追踪一个非常奇怪的错误。这是一个 UILabel 被过度释放，尽管在代码中没有过度释放。如果我注释掉标签的发布，代码就可以了。
我追踪到一个在后台线程中发布的 UIView。这似乎不对，因为您应该从主线程访问所有 UI 元素。然后，我发现一个正在后台线程中加载的 nib 文件，使用：
[[NSBundle mainBundle] loadNibNamed:@"nib name" owner:self options:nil];
我不需要详细了解代码正在执行的操作，但我的问题是：
如果在后台线程中调用 loadNibNamed 并加载视图由 nib 加载过程缓存，然后主线程也想加载该 nib - 但从缓存加载它。当我的对象被释放时 - 从后台笔尖加载的视图是否也在后台释放..？确实没有意义，因为无论如何后台线程都将不再存在......
我不知道，但我通过将 GCD 分派中的代码的 loadNibNamed 部分同步包装到主线程来解决它。
I just spent a day tracking down a really weird bug. It was a UILabel being overreleased, although in the code there was no over-releasing. If I commented out the release of the label, code was fine.
I tracked it down to a UIView that was being released in a background thread. Which didn't seem right as you're supposed to access all UI elements from the main thread. I then found a nib file that was being loaded in a background thread using:
[[NSBundle mainBundle] loadNibNamed:@"nib name" owner:self options:nil];
I don't need to go into the details of what the code was doing, but my question is:
If loadNibNamed is called in a background thread and the view loaded is cached by the nib loading process, then the main thread wants to load that nib too - but loads it from a cache. When my object is released - is the view loaded from the nib in the background also released in the background..?? Doesn't really make sense as the background thread would no longer exist anyway....
I don't know, but I resolved it by wrapping the loadNibNamed part of the code in a GCD dispatch onto main thread synchronously.
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来自 Mike Ash 的文章
危险的可可调用
From Mike Ash's article
Dangerous Cocoa Calls
所有与 UI 相关的操作都应该在主线程中完成。
All UI-related operations should be done from the main thread.