iOS aspect ratio constraint breaks on iOS7, works on iOS8

Question

In my app, I have setup a UIView\'s constraints in a way where its height gets calculated from its width using the aspect ratio constraint. It works perfectly on iOS8 with every

Answer 1

I resolved it You don't set ratio itself. You should set equal with its container But better you should set height constraint follow iPhone 6. You must outlet constrain in your class. In viewDidLoad you must multiplier with DISPLAY_SCALE

 DISPLAY_SCALE = UIScreen.mainScreen().bounds.width / 375

// 375 is width of iPhone 6.

Why do you must do that? I think iOS7 delay when calculator our constraint. And it wrong when show