Question

presentedviewcontroller是什么控制器

Answer 1

2个只读属性：
presentedViewController：The view controller that is presented by this view controlller(read-only)，被本视图控制器present出来的的视图控制器

presentingViewController：The view controller that presented this view controller. (read-only)，present出来本视图控制器的视图控制器

如A-->弹出B, 则A.presentedViewController = B
B.presentingViewController = A

dismissViewControllerAnimated:YES
Dismisses the view controller that was presented modally by the view controller.
也就是在在A上调该方法，dismiss掉A弹出的vc
如果在B上调，会调用presenting view的该方法，即A的该方法，很绕啊。。。