如何从自动版式获取真实帧

Question

I create a view(width:600) with xib and put a UIScrollView(margin both left and right 20) in it. I want to get the scrollView's width in code but I get 560 instead. I'm new to AutoLayout and really want some help, thanks a lot.

Answer 1

It's all a question of when you get the scroll view's width in code. viewDidLoad is too soon. viewDidAppear would be okay. But the best time is viewDidLayoutSubviews , because that's when layout has been performed and the scroll view's width has been set.

Answer 2

You have to load your XIB and call layoutIfNeeded . At the next runloop cycle you will be able to see your actual frame size.