问题描述
这里的行为真的很奇怪.我有一个内部带有滚动视图的视图，其中包含我的界面.
Really strange behaviour here. I've got a view with a scroll view inside, which contains my interface.
在我的 viewDidLoad 中，我将 scrollView 的框架设置为原点为 0,0.
In my viewDidLoad, I set the frame of my scrollView to have an origin of 0,0.
我在 viewDidLoad 的末尾记录了原点，它是 0.但是，在我的 viewWillAppear 开头，原点是 -20.有谁知道可以调用哪种方法来做到这一点?
I log the origin at the end of my viewDidLoad, and it's 0.
However, at the start of my viewWillAppear, the origin is -20.
Does anyone know what kind of method could get called that would do this?
提前致谢
推荐答案
如果您想知道它可能是什么，您可以尝试注册您的视图以进行键值观察，如下所述:http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html
If you want to find out what it could be, you can try registering your view for key value observing, as described here: http://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/KeyValueObserving/KeyValueObserving.html
您可以注册以侦听 frame 属性的更改，然后在 observe 方法中设置一个断点，当您的 origin 设置为奇怪的值时，它应该可以让您准确地看到堆栈跟踪的用途.
You can register to listen for changes to the frame property, and then set a breakpoint in the observe method which should let you see exactly what the stacktrace is for when your origin is set to the strange value.
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