Why is viewDidLayoutSubviews called multiple times?

Question

I\'m developing iOS Universal App with Swift, using auto layout and support only portrait.

I found UIViewController.viewDidLayoutSubviews called multipl

Answer 1

LoadView is only called once: when the view needs to be loaded.

LayoutSubviews, however, is called once per run loop on any view that has had setNeedsLayout or setNeedsDisplayInRect called on it - this includes whenever a subview has been added to the view, scrolling, resizing, etc.