audioSession错误:操作无法完成。(OSStatus错误-50.)

Question

我正在尝试播放来自包(来自项目)的音频文件，当用户设置设备的静音模式时，它应该是安静的。我的密码在这里

 let audioSession = AVAudioSession.sharedInstance()
ringURl = Bundle.main.url(forResource: "ring", withExtension: "m4r")
do {
try audioSession.setCategory(AVAudioSessionCategorySoloAmbient)
try audioSession.overrideOutputAudioPort(speakerType)
}
do {
player = try AVAudioPlayer(contentsOf: ringURl)
guard let player = player else { return }
player?.prepareToPlay()
player?.play()
} catch let error as NSError {
print(error.description)
}
} catch let error as NSError {
print("audioSession error: \(error.localizedDescription)")
}

但它的表演

audioSession错误:操作无法完成。(OSStatus错误-50.)

错误而不起作用。请帮帮忙。

Answer 1

您的代码有一些结构问题。我帮你清理了一下：

class ViewController: UIViewController {

    var audioSession = AVAudioSession.sharedInstance() // we only need to instantiate this once
    var player : AVAudioPlayer? // making this a property means player doesn't get released as soon as playSomething exits

    @IBAction func playSomething(sender: UIButton!)
    {
        if let ringURl = Bundle.main.url(forResource: "ring", withExtension: "m4r")
        {
            do {
                try audioSession.setCategory(AVAudioSessionCategorySoloAmbient)
                try audioSession.overrideOutputAudioPort(.speaker)
            } catch let error as NSError {
                print("audioSession error: \(error.localizedDescription)")
            }

            do {
                let ourPlayer = try AVAudioPlayer(contentsOf: ringURl)
                ourPlayer.prepareToPlay()
                ourPlayer.play()
                self.player = ourPlayer
            } catch let error as NSError {
                print(error.description)
            }
        }
    }

如果您仍然看到"-50“错误，请确保您的.m4r文件包含在您构建的应用程序中。几分钟前，我正在寻找at a related question，所以那里的答案也可能对你有帮助。