Detect when my subclass of UIView is added to another UIView

Question

I want my subclass of UIView to automatically position itself when it is added to the view of the parent container.

Is there any way to determine when it will be added and run my positioning code, or do I need to do something like this?

[parentView addSubview:subView]; [setView calcPosition]; 

Answer 1

UIView provides the willMoveToSuperview: and didMoveToSuperview . Just override the ones you need to know when a view is added to another view (or later deleted).

Answer 2

Write calcPosition methord inside the preview and call it from didMoveToSuperview subview

 - (void)didMoveToSuperview { [super didMoveToSuperview]; [self calcPosition]; }