问题描述
这里真的很奇怪。
我有一个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 ，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的末尾记录原点，它是0.
但是，在我的 viewWillAppear 的开头，原点是-20。
有谁知道可以调用什么样的方法呢？
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
如果你想知道它可能是什么，你可以尝试注册你的视图进行键值观察，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
您可以注册以侦听对frame属性的更改，然后在observe方法中设置一个断点，该断点可以让您准确了解堆栈跟踪的用途。原点设置为奇怪的值。
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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