View frame changes between viewWillAppear: and viewDidAppear:

Question

I have discovered a strange behavior in my application, where a connected IBOutlet has its connected view\'s frame between the calls in my view controller to

Answer 1

From the documentation:

viewWillAppear:

Notifies the view controller that its view is about to be added to a view hierarchy.

viewDidAppear:

Notifies the view controller that its view was added to a view hierarchy.

As a result the frames of the subviews aren't yet set in the viewWillAppear:

The appropriate method to modify your UI before the view is presented to the screen is:

viewDidLayoutSubviews

Notifies the view controller that its view just laid out its subviews.