暂停音频文件以播放不同的音频文件

Question

我正在使用 systemMusicPlayer 在应用程序中播放歌曲。

如果用户在“正在播放”视图中按下 noiseButton，它将暂停 systemMusicPlayer 歌曲音频文件 10 秒以播放 noiseButton 音频文件，然后再选择回来在 systemMusicPlayer 歌曲音频文件上。

我可以让 systemMusicPlayer 歌曲音频文件暂停，然后在 10 秒后恢复，但是我无法让 noiseButton在 10 秒内播放它的声音。

我知道 noiseButton 音频文件有效
我在 NSLog 播放 noiseButton 文件的方法前后

我不确定我错过了什么？

这是我的代码：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    musicPlayer = [MPMusicPlayerController systemMusicPlayer];
    [self registerMediaPlayerNotifications];

    // Construct URL to sound file
    NSString *path = [NSString stringWithFormat:@"%@/background-music-aac.caf", [[NSBundle mainBundle] resourcePath]];
    NSURL *soundUrl = [NSURL fileURLWithPath:path];

    // Create audio player object and initialize with URL to sound
    _audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundUrl error:nil];
}

- (void)willPlayClip {
    [NSTimer scheduledTimerWithTimeInterval:10.0
                                     target:self
                                   selector:@selector(willPlayMusicInTenSeconds:)
                                   userInfo:nil
                                    repeats:NO];
}

- (void)willPlayMusicInTenSeconds:(NSTimer *)timer {
    NSLog(@"Get ready to Play noise sound");
    [_audioPlayer play];
    NSLog(@"Play noise sound");

    [musicPlayer play];
    NSLog(@"Start playing again");
}

noiseButton 中按下时的代码：

if ([musicPlayer playbackState] == MPMusicPlaybackStatePlaying) {
    [musicPlayer pause];
    NSLog(@"Paused!");
    [self willPlayClip];
} else {
    NSLog(@"Already paused");
}

Answer 1

您要设置什么 AudioSession 类别？如果不是，请参阅此文档：

Audio Session Categories

我相信如果您将会话设置为 AVAudioSessionCategoryAmbient:

，您应该会得到想要的行为

The category for an app in which sound playback is nonprimary—that is, your app can be used successfully with the sound turned off.

This category is also appropriate for “play along” style apps, such as a virtual piano that a user plays while the Music app is playing. When you use this category, audio from other apps mixes with your audio. Your audio is silenced by screen locking and by the Silent switch (called the Ring/Silent switch on iPhone).

如果您还没有尝试过，请尝试一下。

暂停音频文件以播放不同的音频文件

Pausing Audio file to play different Audio file

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