A.UIViewControllerB.UINavigationControllerC.UITableViewControllerD.UINavigationBar
A.UITapGestureRecongnizerB.UIPinchGestureRecongnizerC.UIRotationGestureRecognizerD.UISwipeGestureRecongnizer
A.Quartz Core框架B.UIKit框架C.Foundation框架D.Core Graphics框架