【iOS】锁屏界面、控制面板操控音乐播放

同时有效作用区域：AppleTV、AirPlay投射，耳机线控，车载系统显示等位置

关键词：RemoteControl

设定代码

RemoteComtrol会以事件方式通知到整个responder chain，通常在responder chain的末端UIApplication（Swift下使用@UIApplicationMain进行标记）中实现RemoteComtrol事件处理最为合理。

UIApplication.sharedApplication().beginReceivingRemoteControlEvents()

override func remoteControlReceivedWithEvent(event: UIEvent?){
    switch event {
    case is UIEventSubtypeRemoteControlPlay:
        // play
    case is UIEventSubtypeRemoteControlPause:
        // pause
    case is UIEventSubtypeRemoteControlStop:
        // stop
    }
}

UIEventSubtype 中定义的其他枚举事件类型

UIEventSubtypeRemoteControlPlay
UIEventSubtypeRemoteControlPause
UIEventSubtypeRemoteControlStop
UIEventSubtypeRemoteControlTogglePlayPause
UIEventSubtypeRemoteControlNextTrack
UIEventSubtypeRemoteControlPreviousTrack
UIEventSubtypeRemoteControlBeginSeekingBackward
UIEventSubtypeRemoteControlEndSeekingBackward
UIEventSubtypeRemoteControlBeginSeekingForward
UIEventSubtypeRemoteControlEndSeekingForward

参考

iOS音频播放 (八)：NowPlayingCenter和RemoteControl