Swift 3 播放从 Firebase 下载的音频答案

【问题标题】：Swift 3 Play audio downloaded from FirebaseSwift 3 播放从 Firebase 下载的音频
【发布时间】：2017-10-09 18:24:32
【问题描述】：

我是 Swift 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()

    }

    }

【问题讨论】：

标签： ios firebase swift3 firebase-storage

【解决方案1】：

我遇到了同样的问题。我所做的是使用 FileManager 生成存储文件的 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)
                }
            }
        }
    }

我已经试过了，效果很好！

【讨论】：

【解决方案2】：

我遇到了同样的问题。米歇尔的回答帮助了我。尽管您可能需要缓存系统，但您不必使用 FileManager。

https://stackoverflow.com/a/51733033/12208004

func preparePlayer() {
        guard let url = URL(string: "https://yourURL.mp3") else {
            print("Invalid URL")
            return
        }
        do {
            let session = AVAudioSession.sharedInstance()
            try session.setCategory(AVAudioSessionCategoryPlayback)
            let soundData = try Data(contentsOf: url)
            audioPlayer = try AVAudioPlayer(data: soundData)
            audioPlayer.prepareToPlay()
            audioPlayer.volume = 0.7
            audioPlayer.delegate = self
            let minuteString = String(format: "%02d", (Int(audioPlayer.duration) / 60))
            let secondString = String(format: "%02d", (Int(audioPlayer.duration) % 60))
            print("TOTAL TIMER: \(minuteString):\(secondString)")
        } catch {
            print(error)
        }
    }

【讨论】：

【解决方案3】：

您也可以在不下载的情况下播放音频。为此，您应该：

1) 获取下载地址

2) 用这个 url 启动 AVPlayerItem

3) 设置播放器并播放

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)

【讨论】：