Swift 3播放从Firebase下载的音频

Question

我是Swift的新手，我设法从firebase下载音频并将其存储在本地，但不知道如何使用AVAudioPlayer。任何帮助，将不胜感激。这是我到目前为止所得到的。

class FireBaseViewController: UIViewController {

     var audioPlayer:AVAudioPlayer = AVAudioPlayer()

    override func viewDidLoad() {
        super.viewDidLoad()


        let storageRef = FIRStorage.storage().reference()

        let files = storageRef.child("Audio/Self Commitment.m4a")

        let localURL: NSURL! = NSURL(fileURLWithPath:"/Users/wayne/Desktop/Playground/Audio/Self Commitment.m4a")

        let downloadTask = files.write(toFile: localURL as URL) { (URL, error) -> Void in
                        if (error != nil) {
                            print("Uh-oh, an error occurred!")
                        } else {
                             print("Local file URL for  is returned")
                        }
                    }

                let audioPath = localURL

        do {

            try audioPlayer = AVAudioPlayer(contentsOf:URL(fileURLWithPath: audioPath))

        }   catch {print("file is unavilable")

        }
       audioPlayer.play()

    }

    }

Answer 1

我有同样的问题。我所做的是使用FileManager生成我将存储文件的URL

let fileURL = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent("file_name.mp3")

然后你可以保存文件并像这样播放：

storeRef.getData(maxSize: 10 * 1024 * 1024) { (data, error) in
        if let error = error {
            print(error)
        } else {
            if let d = data {
                do {
                    try d.write(to: fileURL)
                    self.audioPlayer = try AVAudioPlayer(contentsOf: fileURL)
                    self.audioPlayer.play()
                } catch {
                    print(error)
                }
            }
        }
    }

我已经尝试过了，它有效！

Answer 2

您也可以播放音频而无需下载。要做到这一点，你应该：

1）获取下载URL

2）使用此URL启动AVPlayerItem

3）设置播放器和播放

Swift 4.2

let storage = Storage.storage()    
let storageReference = storage.reference(forURL: storagePath)
            storageReference.downloadURL { (hardUrl, error) in
                if error == nil, let url = hardUrl {
                    self.playerItem = AVPlayerItem(url: url)
                    self.playerInstance = AVPlayer(playerItem: self.playerItem)