Spotify 如何自定义 iOS 上的媒体播放控件？

Question

iOS 上的 Spotify 有一个非常有趣的控制中心集成。注意下面的汉堡按钮。

锁屏上也是一样！

他们是怎么做到的？ MPMediaCenter 中有 API 吗？

Answer 1

是的，有一个 API

查看苹果文档中关于remote control events 的说明，您会看到两个类MPRemoteCommand 和MPRemoteCommandCenter 突出显示。查找 MPRemoteCommandCenter 会显示有许多命令，例如 likeCommand 或 dislikeCommand，您可以为其添加处理程序。将处理程序添加到这些命令会导致它们在控制中心中显示。

以下是一些多合一代码，实现的结果与屏幕截图中显示的结果几乎完全相同：

- (void)showCustomizedControlCenter {
    /* basic audio initialization */
    NSString *soundFilePath = [NSString stringWithFormat:@"%@/test.mp3", [[NSBundle mainBundle] resourcePath]];
    NSURL *soundFileURL = [NSURL fileURLWithPath:soundFilePath];

    self.player = [[AVAudioPlayer alloc] initWithContentsOfURL:soundFileURL error:nil];
    self.player.numberOfLoops = -1;
    [self.player play];

    /* registering as global audio playback */
    [[AVAudioSession sharedInstance] setActive:YES error:nil];
    [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

    /* the cool control center registration */
    MPRemoteCommandCenter *commandCenter = [MPRemoteCommandCenter sharedCommandCenter];
    [commandCenter.playCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent *event) {
        return MPRemoteCommandHandlerStatusSuccess;
    }];
    [commandCenter.dislikeCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent *event) {
        return MPRemoteCommandHandlerStatusSuccess;
    }];
    [commandCenter.likeCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent *event) {
        return MPRemoteCommandHandlerStatusSuccess;
    }];
    [commandCenter.nextTrackCommand addTargetWithHandler:^MPRemoteCommandHandlerStatus(MPRemoteCommandEvent *event) {
        return MPRemoteCommandHandlerStatusSuccess;
    }];

    /* setting the track title, album title and button texts to match the screenshot */ 
    commandCenter.likeCommand.localizedTitle = @"Thumb Up";
    commandCenter.dislikeCommand.localizedTitle = @"Thumb down";

    MPNowPlayingInfoCenter* info = [MPNowPlayingInfoCenter defaultCenter];
    NSMutableDictionary* newInfo = [NSMutableDictionary dictionary];

    [newInfo setObject:@"Mixtape" forKey:MPMediaItemPropertyTitle];
    [newInfo setObject:@"Jamie Cullum" forKey:MPMediaItemPropertyArtist];

    info.nowPlayingInfo = newInfo;
}

除了写代码你还需要

• 将AVFoundation 添加到您的项目中
• #import <AVFoundation/AVFoundation.h> 和 #import <MediaPlayer/MediaPlayer.h>
• 在应用设置中激活后台模式"Audio and AirPlay"。