swift 在用户 phone 通话后开始播放音乐

Question

我不太确定我是否缺少某个功能或其他东西，但是当用户 phone 响铃或者他们询问 siri 或任何阻止我的应用程序音频播放的东西时。当用户完成他们的任务时，它不会重新启动我的应用程序播放。

我想知道我是否缺少某个功能，或者 Apple iOS 应用程序不能执行此操作吗？

我认为这与以下内容有关：

func setupRemoteTransportControls() {
   // Get the shared MPRemoteCommandCenter
    let commandCenter = MPRemoteCommandCenter.shared()

    // Add handler for Play Command
    commandCenter.playCommand.addTarget { [unowned self] event in
        if self.player?.rate == 0.0 {
            self.player?.play()
            return .success
        }
        return .commandFailed
    }

    // Add handler for Pause Command
    commandCenter.pauseCommand.addTarget { [unowned self] event in
        if self.player?.rate == 1.0 {
            self.player?.pause()
            return .success
        }
        return .commandFailed
    }

   // self.nowplaying(artist: "Anna", song: "test")


}

我发现我需要添加这部分，但我该如何调用它？

func handleInterruption(notification: Notification) {

        guard let userInfo = notification.userInfo,
            let interruptionTypeRawValue = userInfo[AVAudioSessionInterruptionTypeKey] as? UInt,
            let interruptionType = AVAudioSession.InterruptionType(rawValue: interruptionTypeRawValue) else {
            return
        }

        switch interruptionType {
        case .began:
            print("interruption began")
        case .ended:
            print("interruption ended")
        default:
            print("UNKNOWN")
        }

    }

Answer 1

您需要将音频会话设置为 AVAudioSessionCategoryPlayback. If you don't set this mode, you will have the default mode AVAudioSessionCategorySoloAmbient。

您可以在didFinishLaunching中设置模式。

例如

func application(_ application: UIApplication,
                 didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    
    // Get the singleton instance.
    let audioSession = AVAudioSession.sharedInstance()
    do {
        // Set the audio session category, mode, and options.
        try audioSession.setCategory(.playback, mode: .default, options: [])
    } catch {
        print("Failed to set audio session category.")
    }
    
    // Other post-launch configuration.
    return true
}

您还需要实施 interruption observation

func setupNotifications() {
    // Get the default notification center instance.
    let nc = NotificationCenter.default
    nc.addObserver(self,
                   selector: #selector(handleInterruption),
                   name: AVAudioSession.interruptionNotification,
                   object: nil)
}

@objc func handleInterruption(notification: Notification) {
    // To be implemented.
}

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