View frame changes between viewWillAppear: and viewDidAppear:

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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.

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