视频播放如何横竖屏切换

最近一直在做视频相关的项目，其中一个很重要的功能就是播放时的横竖屏切换，于是研究对比了下市场上主要视频类APP的横竖屏切换方式，共分为两种，一种以优酷视频和土豆视频为代表，当横放手机时整个界面都旋转了，另一种以腾讯视频，搜狐视频为代表，当横放手机时只是播放的小视图旋转，其余内容不变。实现方法分别如下。

1 优酷视频的横竖屏切换的实现方法

首先控制整个viewcontroller的view支持横竖屏切换的几个方法

- (BOOL)shouldAutorotate{
    return YES;
}
- (NSUInteger)supportedInterfaceOrientations{
    return UIInterfaceOrientationMaskAllButUpsideDown;
}
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{
    return UIInterfaceOrientationPortrait;
}

然后添加监测屏幕方向变化的通知

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(orientationHasChange:) name:UIDeviceOrientationDidChangeNotification object:nil];
}

接着在通知的回调方法中操作如下

- (void)orientationHasChange:(NSNotification *)notification{
    UIDevice *device = (UIDevice *)notification.object;
if(device.orientation == UIInterfaceOrientationLandscapeLeft){
        [self rotateToLandscapeLeft];
    }
else if(device.orientation == UIInterfaceOrientationLandscapeRight){
        [self rotateToLandscapeRight];
    }
else if(device.orientation == UIInterfaceOrientationPortrait){
        [self rotateToPortrait];
    }
}
- (void)rotateToFullScreen{
if(SCREEN_WIDTH>SCREEN_HEIGHT){
        _videoPlayManageView.frame = CGRectMake(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
    }
else{
        _videoPlayManageView.frame = CGRectMake(0, 0, SCREEN_HEIGHT, SCREEN_WIDTH);
    }
    [_videoPlayManageView enterInFullScreen];
}
- (void)rotateToLandscapeLeft{
if(_lastOrientationValue==UIInterfaceOrientationLandscapeLeft){
return;
    }
    [self rotateToFullScreen];
    _lastOrientationValue = UIInterfaceOrientationLandscapeLeft;
}
- (void)rotateToLandscapeRight{
if(_lastOrientationValue==UIInterfaceOrientationLandscapeRight){
return;
    }
    [self rotateToFullScreen];
    _lastOrientationValue = UIInterfaceOrientationLandscapeRight;
}
- (void)rotateToPortrait
{
if(_lastOrientationValue==UIInterfaceOrientationPortrait){
return;
    }
    _videoPlayManageView.frame = _normalScreenFrame;
    [_videoPlayManageView exitFromFullScreen];
    _lastOrientationValue = UIInterfaceOrientationPortrait;
}

最后，如果想强制播放器横屏或者竖屏播放，可以这样

- (void)videoPlayManageViewExitFullScreenButtonTapped{
if([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]){
 SEL selector = NSSelectorFromString(@"setOrientation:");
 NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        int val = UIInterfaceOrientationPortrait;
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }
    [UIViewController attemptRotationToDeviceOrientation];
}
- (void)videoPlayManageViewEnterFullScreenButtonTapped{
if([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]){
 SEL selector = NSSelectorFromString(@"setOrientation:");
 NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
        [invocation setSelector:selector];
        [invocation setTarget:[UIDevice currentDevice]];
        int val = UIInterfaceOrientationLandscapeRight;
        [invocation setArgument:&val atIndex:2];
        [invocation invoke];
    }
    [UIViewController attemptRotationToDeviceOrientation];
    [self rotateToLandscapeRight];
}

OK，大功告成。

PS:demo完整版下载地址为：

https://github.com/wangqi211/VideoPlayDemo.git