How to Use autolayout, sizeclass, and ios8autolayout after iOS8

How to Use autolayout, sizeclass, and ios8autolayout after iOS8

After iOS8, how to use autolayout and sizeclass in combination with code writing Layout

After xcode6.0, sizeclass is displayed, and The use interface of autolayout is also changed.

It seems that it saves a lot of time and a lot of code. But, when I want to use code to write a control on the page, I need to use the code to get

Coordinates of controls in current autolayout.

-(Void) viewWillLayoutSubviews;

-(Void) viewDidLayoutSubviews;

The above two methods can solve this problem. The frame obtained after this method is the frame currently displayed on the screen. So, use it as you like. But do not want

Obtain the frame and call it in viewDidLoad. Because these two methods are called later.

Attach the call sequence of the functions in the controller:

InitWithNibName: bundle/initWithCode (if storyboard is used) Producer