AVAudioEngine声音故障

Question

基本上，我的应用程序有两种模式：第一种播放应用程序音乐，第二种播放应用程序音乐以及其他应用程序...在它们之间切换时，无法播放正确的音乐有时：

Common.fs
Workflow1\Impl1.fs
Workflow2\Impl2.fs

有时它会显示类似错误

do {
    if sound > 1 {
        // 1st mode play with app sound
        if !FromStart {
            print("sound > 1", self.audioEngine.isRunning)
            self.audioEngine.stop()
            self.audioEngine.reset()
            try AVAudioSession.sharedInstance().setActive(false)
            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
            try AVAudioSession.sharedInstance().setActive(true)

            // sleep(1)
            //try self.audioEngine.start()

            do {
                // 3
                try self.audioEngine.start()

            } catch let error {
                print("error sound > 1",error.localizedDescription)
            }

            if !FromStart { 
                self.PlayNewButtonSound() 
            }
        }

    } else if sound > 0 {
        //2nd mode play with other app sound
        if !FromStart {
            self.audioEngine.stop()
        }

        //print("sound > 0", self.audioEngine.isRunning)
        try AVAudioSession.sharedInstance().setActive(false)
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback, with: [.mixWithOthers])
        try AVAudioSession.sharedInstance().setActive(true)

        //try self.audioEngine.start()
        do {
            // 3
            try self.audioEngine.start()

        } catch let error {
            print("error > 0",error.localizedDescription)
        }

        self.skHomesound?.run(SKAction.stop())
        if !FromStart {
            self.PlayNewButtonSound() 
        }
    }

} catch {
    print("Problem with enable sound error = \(error.localizedDescription)")
}