程序的根控制器用了UINavigationController。下面是代碼：

1.在appdelegate中添加代碼：

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window

{

    return UIInterfaceOrientationMaskAll;

}

2.給UINavigationController添加個category，在實現文件中添加如下代碼：

-(BOOL)shouldAutorotate

{

    return [[self topViewController] shouldAutorotate];

}

 

-(NSUInteger)supportedInterfaceOrientations

{

    return [[self topViewController] supportedInterfaceOrientations];

}

 

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation

{

    return [[self topViewController] preferredInterfaceOrientationForPresentation];

}

3.在需要橫屏的地方添加（豎屏可以更換方向）：

-(NSUInteger)supportedInterfaceOrientations{

   

    return UIInterfaceOrientationMaskLandscapeRight;  // 可以修改為任何方向

}

-(BOOL)shouldAutorotate{

    return YES;

}

 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {

    return interfaceOrientation == UIInterfaceOrientationLandscapeRight;

}

4.最重要的是：頁面之間切換不能用導航控制器切換，必須使用：

[self presentViewController:navigationController animated:YES completion:Nil];