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如何从辅助线程中查找对UIKit实例的调用？

分类: 技术问答 • 2022-04-20 12:03:16
问题描述：

我的应用程式在iOS 5中崩溃，因为我有一些代码从辅助线程调用UIKit实例。你知道你有这个问题，当你看到以下错误：

My app is crashing in iOS 5 because I have some code that is calling UIKit instances from a secondary thread. You know you have this problem when you see the following error:

bool _WebTryThreadLock（bool），0x811bf20：多个锁在网络线程不允许！请提交错误。现在崩溃...

所以我的问题是什么是一些方法，我可以找到从辅助线程调用UIKit实例的代码？

So my question is what are some ways that I can find the code that is calling the UIKit instances from a secondary thread?

这里有一些我已经尝试过的东西：

Here are some things I’ve tried already:


  1. 注释掉可能是违反规则

  2. 在可能正在处理次要主题的地方新增 assert（[NSThread isMainThread]） $ b
  3. 为 _WebTryThreadLock 添加了符号断点

  1. Commented out blocks that could be violating the rule
  2. Added assert([NSThread isMainThread]) in places that might be processing in secondary thread
  3. Added a symbolic breakpoint for _WebTryThreadLock

帮助我找到问题领域。然而，在我的最后崩溃中， _WebTryThreadLock 断点在任何其他线程中没有堆栈跟踪。

These things have helped me to find problem areas. However, in my final crash the _WebTryThreadLock breakpoint has no stack trace in any of the other threads. So, how I can find the code that causing the problem without a stack trace?

感谢您的时间！

答

您的 assert（）可能是最有价值的工具。我已经知道在我的Controller类中的每个方法的开头放一个类似的断言。如果没有找到它，我添加断言到我的View类。如果没有找到它，我将它添加到任何我认为是主线程的模型类。

Your assert() is probably the most valuable tool in this. I've been known to put a similar assertion at the beginning of every method in my Controller classes. If that doesn't find it, I add the assertion to my View classes. If that doesn't find it, I add it to any Model classes that I think are main-thread only.

To @ craig的注释，它声称是一个内部错误可能是准确的。但我认为你是在正确的道路上仔细检查你自己的代码。

To @craig's comment, the fact that it claims to be an internal bug might be accurate. But I think you're on the right path to closely examine your own code first.

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