广告：系统方法监听横竖屏，前提是要开启了横竖屏才可以用。iPad上可能有点用。

方法1，别人封装的一个导航，跳转vc时套上即可横竖屏切换ChangeOrientation

详细介绍

方法2，自己动手实现，切换播放器时的例子。

关闭横竖屏

- (void)viewDidLoad {
    [super viewDidLoad];
    //监听横竖屏
    [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChange) name:UIDeviceOrientationDidChangeNotification object:nil];
}

//监听横竖屏切换的通知
- (void)deviceOrientationDidChange
{
    NSLog(@"deviceOrientationDidChange:%ld",(long)[UIDevice currentDevice].orientation);
    if([UIDevice currentDevice].orientation == UIDeviceOrientationPortrait) {
        [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait];
        //往左侧，全屏
        [self orientationChange:NO];
        //旋转屏幕改变播放器frame（如果是约束，这部可以省了。）
        self.playerView.frame=CGRectMake(0, 0, self.view.bounds.size.width, 200);
        
    } else if ([UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft) {
        [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight];
        //往右侧，恢复原始大小
        [self orientationChange:YES];
        //旋转屏幕改变播放器frame（如果是约束，这部可以省了。）
        self.playerView.frame=self.view.bounds;
    }
}


#pragma mark - 手动旋转当前view
- (void)orientationChange:(BOOL)landscapeRight
{
    if (landscapeRight) {
        [UIView animateWithDuration:0.2f animations:^{
            self.view.transform = CGAffineTransformMakeRotation(M_PI_2);
            self.view.bounds = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
        }];
    } else {
        [UIView animateWithDuration:0.2f animations:^{
            self.view.transform = CGAffineTransformMakeRotation(0);
            self.view.bounds = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
        }];
    }
}

/*
    关闭自动旋转
    在设备出于横屏时，界面就会变成横屏；
    设备处于竖屏时，界面就会变成竖屏。
 */
- (BOOL)shouldAutorotate
{
    return NO;
}
/*
    移除通知，防止内存泄漏。
*/
- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}