UIWebViewClassReference对mediaPlaybackAllowsAirPlay的描述如下:ABooleanvaluethatdetermineswhetherAirPlayisallowedfromthisview.当mediaPlaybackAllowsAirPlay设置为YES时:如果在我的iPad上我将YouTube或Vimeo视频加载到UIWebView并将此设置为默认值YES并在镜像到AirPlay设备的同时播放视频，视频信号将发送到AirPlay设备并接管AirPlay设备屏幕AirPlay的UIWebView中显示“TVConnected/Thisv