WebView加载html播放视频的横屏问题

最近在做webview加载html播放YouTube视频，由于我们的app默认是竖屏的，在播放视频的时候点击全屏按钮调取系统的AVPlayerViewController后，显示全屏，但是不能竖屏，导致播放区域就那么大，看着有些不爽，就想怎么才能横屏看，播放区域大了，看的才够过瘾，于是在网上搜了一些资料，最终完美解决了

1.首先是在AppDelegate中去设置横屏竖屏模式

//控制是否允许横屏
@property (nonatomic,assign) BOOL allowRotation;

- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {

    if (self.allowRotation) {
        return UIInterfaceOrientationMaskAll;
    }
    return UIInterfaceOrientationMaskPortrait;
}

在你调用播放器的地方去控制这个allowRotation属性，系统会执行适配屏幕的方法

2.在播放视频的控制器中需要做以下处理，由于我们不方便取得AVPlayeView，所以全屏时候的监听对象就变成了UIWindow，因为全屏时播放view是加到UIWindow上的

//注册通知
 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(begainFullScreen) name:UIWindowDidBecomeVisibleNotification object:nil];//进入全屏
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(endFullScreen) name:UIWindowDidBecomeHiddenNotification object:nil];//退出全屏

//实现方法
#pragma - mark  进入全屏
-(void)begainFullScreen
{
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    appDelegate.allowRotation = YES;
}
#pragma - mark 退出全屏
-(void)endFullScreen
{
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    appDelegate.allowRotation = NO;
    
    //强制归正：
    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];
    }
}

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