"iOS Dev-120" How to use size Classes in storyboard is actually setting up multiple sets of AutoLayout

(1) Use size Classes in storyboard.

We have used AutoLayout before, and now we have a size Classes, which can be seen as AutoLayout settings under different size Classes.

Detailed tutorials, http://www.cocoachina.com/ios/20141020/9978.html

--Seemingly, storyboard's functions are becoming more powerful. The adaptation of different sizes and screens is enough to make it a pain to hit the code.

--Find a lot of blog posts, found that almost all talk about how to use size classes in storyboard, almost no code to achieve size classes.

Reference from Joywii ' s Blog:ios8 Size classes Understanding and use

-(void) Willtransitiontotraitcollection: (uitraitcollection *) newcollection               withtransitioncoordinator: (ID < uiviewcontrollertransitioncoordinator>) coordinator{    [Super Willtransitiontotraitcollection:newcollection                  Withtransitioncoordinator:coordinator];    [Coordinator animatealongsidetransition:^ (ID <UIViewControllerTransitionCoordinatorContext> context)     {        if (Newcollection.verticalsizeclass = = uiuserinterfacesizeclasscompact) {            //to do:modify something for Compact vertical Size        } else {            //to do:modify something for other vertical size        }        [Self.view setneedslay Out];    } Completion:nil];}

in two to do, we want the handwritten code to be adjusted for different states.

iOS Dev-120 How to use size Classes in storyboard is actually setting up multiple sets of AutoLayout