iOS-Events[5]-Remote Control Events

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iOS系统的Events类型分为以下几种：Multitouch events, Accelerometer events, Remote control events。

Events

Remote Control Events

Remote Control Events指通过外设的远程遥控或者通过手机的命令面板进行的控制事件，例如多媒体控制，音量调节，速率调节等。所有的Media Apps都应该支持该事件。

Handling Remote Control Events

接收远程的控制事件，代码如下：

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MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];
[commandCenter.playCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
	NSLog(@"RemoteControl:Play");
	...
	return MPRemoteCommandHandlerStatusSuccess;
}];
[commandCenter.pauseCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent * _Nonnull event) {
	NSLog(@"RemoteControl:Pause");
	...
	return MPRemoteCommandHandlerStatusSuccess;
}];

注意，如果不设置Command的block事件，则对应的按钮不会在控制面板和锁屏页面出现。

Providing Now Playing Information

在控制面板和锁屏页面要能看到歌曲的信息，需要设置一下：

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- (void)configureNowPlayingInfo
{
    MPNowPlayingInfoCenter* info = [MPNowPlayingInfoCenter defaultCenter];
    NSMutableDictionary* newInfo = [NSMutableDictionary dictionary];
    [newInfo setObject:@"还没说出口的话" forKey:MPMediaItemPropertyTitle];
    [newInfo setObject:@"唐琳" forKey:MPMediaItemPropertyArtist];
    [newInfo setObject:[[MPMediaItemArtwork alloc]initWithImage:[UIImage imageNamed:@"Background.png"]] forKey:MPMediaItemPropertyArtwork];
    [newInfo setObject:[NSNumber numberWithDouble:4 * 60 + 32] forKey:MPMediaItemPropertyPlaybackDuration];
    [newInfo setObject:[NSNumber numberWithDouble:0] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
    info.nowPlayingInfo = newInfo;
}