How to write layouts using Autolayout,sizeclass with code after iOS8

How Autolayout,sizeclass works with code write layout after iOS8

after the xcode6.0, Sizeclass appeared, and AutoLayout's user interface changed.

So accustomed to drag, as if save a lot of time, also saved a lot of code. But, when I want to use code to write a control in a page, I need to get it in code.

The coordinates of the control inside the current AutoLayout.

-(void) viewwilllayoutsubviews;

-(void) viewdidlayoutsubviews;

The above two methods can solve this problem. The frame acquired after this method is the frame currently displayed on the screen. So, enjoy it. But don't want to be

This gets the frame and then calls inside the viewdidload. Because, these two methods are called after.

Enclose the sequence of calls to the controller inside the function:

Initwithnibname:Bundle  /  Initwithcode (if using storyboard)LoadviewViewdidloadViewwillappearviewwilllayoutsubviewsviewdidlayoutsubviewsViewdidappearViewwilldisappearViewdiddisappear

How to write layouts using Autolayout,sizeclass with code after iOS8