自定义转场动画

介绍功能：
http://blog.csdn.net/wangxiaoit/article/details/45958221

讲解实例：
http://www.cocoachina.com/ios/20160215/15263.html

细数AutoLayout以来UIView和UIViewController新增的相关API:
http://www.cocoachina.com/ios/20141026/10045.html