Question

在我的应用程序中，我想在视图旋转之前进行一些处理。是否有一个事件在轮换发生之前就会发生？

谢谢，艾伦

Answer 1

UIViewController中有许多事件在轮换期间被触发。在旋转之前触发以下两个：

- (void) willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation

“在用户界面开始旋转之前发送到视图控制器。”

- (void) willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration

“在执行一步用户界面旋转之前发送到视图控制器。”

Answer 2

查看UIViewController的这些方法：

http://developer.apple.com/library/ios/#documentation/uikit/reference/UIViewController_Class/Reference/Reference.html

// Notifies when rotation begins, reaches halfway point and ends.
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;


- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation;

// Faster one-part variant, called from within a rotating animation block, for additional animations during rotation.
// A subclass may override this method, or the two-part variants below, but not both.
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0);

// Slower two-part variant, called from within a rotating animation block, for additional animations during rotation.
// A subclass may override these methods, or the one-part variant above, but not both.
- (void)willAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;
- (void)didAnimateFirstHalfOfRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation; // The rotating header and footer views are offscreen.
- (void)willAnimateSecondHalfOfRotationFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation duration:(NSTimeInterval)duration; // A this point, our view orientation is set to the new orientation.

享受

iPhone活动何时即将轮换？

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