iOS模态相关的小日记

presentingViewController  正在跳转的controller

presentedViewController 跳转完的controller

parentViewController 父controller

presentationController 跳转状态的controller

popoverPresentationController 采用导航栏跳转状态的control

view.presentingviewcontroller.presentingviewcontroller 

A. presentedViewController = B

B. presentingViewController = A