ios - 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。注意下面的汉堡包按钮。

锁屏也是一样!

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 的说明你有两个类(class)MPRemoteCommand和 MPRemoteCommandCenter突出显示。抬头看MPRemoteCommandCenter会告诉你有很多命令，比如 likeCommand或 dislikeCommand您可以添加处理程序。向这些命令添加处理程序会使它们显示在控制中心中。

下面是一些一体化代码，可实现与屏幕截图中显示的结果几乎完全相同的结果:

- (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

• 添加AVFoundation到你的项目
• #import <AVFoundation/AVFoundation.h>和 #import <MediaPlayer/MediaPlayer.h>
• 激活背景模式"Audio and AirPlay"在应用程序设置中。