iOS：didReceiveMemoryWarning的有用性： [英] iOS: helpfulness of didReceiveMemoryWarning:

问题描述

我在我的开发过程的一部分，用于跟踪崩溃和内存泄漏。作为一个策略，你把任何NSLog消息或一些这样的通知到 didReceiveMemoryWarning：？这种方法的文档相当稀疏。是准确的说，在崩溃发生之前，UIViewController会触发该方法吗？

I'm at the part of my development process for tracking down crashing and memory leaks. As a strategy, do you put any NSLog messages or notifications of some such into didReceiveMemoryWarning:? The documentation for this method is rather sparse. Is it accurate to say that before a crash will happen, the UIViewController will trigger that method? Is that a starting point before even going forward with Instruments?

推荐答案

确定，注意几件事：

• didReceiveMemoryWarning将在内存崩溃之前调用。不是其他崩溃。如果您正确处理警告并释放内存，则可以避免内存不足的情况，而不会崩溃。


• 您可以在模拟器中手动触发内存警告菜单。


• 仪器可帮助您调试泄漏（虽然不是全部），但对崩溃并不是非常有用。


• 不，我不个人使用NSLog - 我只是在调试时断开内存警告。

• didReceiveMemoryWarning will be called before an out-of-memory crash. Not other crashes. If you handle the warning properly and free up memory, then you can avoid the out-of-memory condition and not crash.
• You can manually trigger a memory warning in the simulator under the Hardware menu. Highly recommend doing this to test your handling of didReceiveMemoryWarning.
• Instruments helps you debug leaks (though not all of them) - it's not really that useful for crashes.
• No, I don't personally use NSLog - I just breakpoint the memory warnings when I'm debugging.

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