dismissViewControllerAnimated:completion:
Dismisses the view controller that was presented by the receiver. - (void)dismissViewControllerAnimated:(BOOL)flag completion:(void (^)(void))completion Parameters
flag
Pass YES to animate the transition. completion
A block called after the view controller has been dismissed.
Discussion
The presenting view controller is responsible for dismissing the view controller it presented. If you call this method on the presented view controller itself, it automatically forwards the message to the presenting view controller.
If you present several view controllers in succession, thus building a stack of presented view controllers, calling this method on a view controller lower in the stack dismisses its immediate child view controller and all view controllers above that child on the stack. When this happens, only the top-most view is dismissed in an animated fashion; any intermediate view controllers are simply removed from the stack. The top-most view is dismissed using its modal transition style, which may differ from the styles used by other view controllers lower in the stack.
If you want to retain a reference to the receiver’s presented view controller, get the value in the presentedViewController property before calling this method.
The completion handler is called after the viewDidDisappear: method is called on the presented view controller. Availability
Available in iOS 5.0 and later.
閱讀文檔的UIViewController ,他們會告訴你用什麼來代替 – wattson12
給你創建'picker' ViewController的代碼以及如何:) – 2012-09-28 13:29:38