关于UIView addSubview

Question

I have two UIViews, named A and B, and I add UIView B into A's subviews:

[A.view addSubview B]

I am wondering is there any delegation or hook that B can be informed "Oh, I was added into A!" when it was added to A? or any other way to let B know it was added to some other UIView container?

Answer 1

您可以在UIView子类中重写willMoveToSuperview:或didMoveToSuperview方法，以便在将视图添加到另一个视图时得到通知。