在iPhone中更改方向时，如何更改viewcontroller的视图？

我正在开发一个支持两种方向的iPhone应用程序。我有2个用于此视图控制器的UIView文件。我需要根据设备接口方向为视图控制器设置相应的UIView文件。你能告诉我如何改变方向吗？

只要在控制器中为这名学员提供两个方向

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
    return YES;
}

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假设您已设置

-（BOOL）shouldAutorotateToInterfaceOrientation:（UIInterfaceOrientation）interfaceOrientation

以返回支持的方向，则可以使用以下方法，这些方法都可以在UIViewController中设置，以检查方向更改，然后设置视图：

// called just before the user interface starts to rotate - my advice would be to use this method to save a copy of the current orientation.
-(void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration

// called after the interface has finished rotating. Here, you can compare the old orientation with the new one - if you went from portrait to landscape, then update your views accordingly.
-(void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation

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希望这有帮助

为什么要对两个方向使用两个视图？若纵向和横向两种模式都有相似的控件显示在同一位置，则可以设置控件的autoresizemask属性。否则，您需要在中使用两个视图

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration;
- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation;

或者，您可以获得UIDevice的通知

 UIKIT_EXTERN NSString *const UIDeviceOrientationDidChangeNotification;

- (void)beginGeneratingDeviceOrientationNotifications;      // nestable
- (void)endGeneratingDeviceOrientationNotifications;