关于ios转屏问题，某个界面需要支持转屏

//Appdelegate.h
 @property(nonatomic,assign)BOOL Orientations;
 //Appdelegate.m
(NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window { if(Orientations) { return UIInterfaceOrientationMaskAllButUpsideDown; } return UIInterfaceOrientationMaskPortrait;

}

//要旋转的页面中
 UIDevice *device = [UIDevice currentDevice]; //Get the device object
 [device beginGeneratingDeviceOrientationNotifications]; //Tell it to start monitoring the accelerometer for orientation
 NSNotificationCenter *nc = [NSNotificationCenter defaultCenter]; //Get the notification centre for the app
 [nc addObserver:self selector:@selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:device];

AppDelegate *delegate=[[UIApplication sharedApplication]delegate];
 delegate.Orientations=YES;

(void)orientationChanged:(NSNotification *)note {
 UIDeviceOrientation o = [[UIDevice currentDevice] orientation];

switch (o) {
 case UIDeviceOrientationPortrait: // Device oriented vertically, home button on the bottom
    break;
case UIDeviceOrientationPortraitUpsideDown:  // Device oriented vertically, home button on the top

    break;
case UIDeviceOrientationLandscapeLeft:      // Device oriented horizontally, home button on the right
    [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:YES];

    break;
case UIDeviceOrientationLandscapeRight:      // Device oriented horizontally, home button on the left
    [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeLeft animated:YES];

    break;
default:
    break;


}
 }


(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
 {
 // 操作
 return YES; // YES为允许横屏，否则不允许横屏
 }

希望对你有帮助。