iOS 屏幕旋转 指定某一页VC可以旋转

在AppDelegate.m中

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

{

          if (_allowRotation == 1) {

                 return UIInterfaceOrientationMaskAll;

          }else{

                return (UIInterfaceOrientationMaskPortrait);

          }

}

// 支持设备自动旋转

- (BOOL)shouldAutorotate

{

      if (_allowRotation == 1) {

       return YES;

     }

    return NO;

}

在旋转的屏幕中

_appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate; _appDelegate.allowRotation = 1;