English :
Only need to drag the file to the project. "UINavigationController+SafeTransition.m"
Solve the bug of iOS : can't add self as subview
中文 :
只需拖到项目中, 只要这一个.m文件就可以了 "UINavigationController+SafeTransition.m"
解决 iOS 系统的 bug : can't add self as subview