在 Swift 錄音

Question

有誰知道我在哪里可以找到有關如何在 Swift 應用程序中錄制音頻的信息？ 我一直在查看一些音頻播放示例，但我似乎無法找到任何關於實現錄音的內容。 謝謝

Answer 1

這是代碼。您可以輕松記錄。在IBAction上編寫此代碼。它將以名稱recordTest.caf將記錄保存在Documents 。

//declare instance variable 
var audioRecorder:AVAudioRecorder!
func record(){        
    var audioSession:AVAudioSession = AVAudioSession.sharedInstance()
    audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord, error: nil)
    audioSession.setActive(true, error: nil)

    var documents: AnyObject = NSSearchPathForDirectoriesInDomains( NSSearchPathDirectory.DocumentDirectory,  NSSearchPathDomainMask.UserDomainMask, true)[0]
    var str =  documents.stringByAppendingPathComponent("recordTest.caf")
    var url = NSURL.fileURLWithPath(str as String)

    var recordSettings = [AVFormatIDKey:kAudioFormatAppleIMA4,
        AVSampleRateKey:44100.0,
        AVNumberOfChannelsKey:2,AVEncoderBitRateKey:12800,
        AVLinearPCMBitDepthKey:16,
        AVEncoderAudioQualityKey:AVAudioQuality.Max.rawValue]

    println("url : \(url)")
    var error: NSError?

    audioRecorder = AVAudioRecorder(URL:url, settings: recordSettings, error: &error)
    if let e = error {
        println(e.localizedDescription)
    } else {
        audioRecorder.record()
    }        
}

Answer 2

在Swift 3中

• 添加框架AVFoundation
• **在info.plist中添加鍵值

密鑰 =隱私-麥克風使用說明和值 =用於使用麥克風

（如果您不提供該值，則應用程序將崩潰-說明您請求權限的原因）**

• 導入AVFoundation和AVAudioRecorderDelegate，AVAudioPlayerDelegate

   import AVFoundation class RecordVC: UIViewController , AVAudioRecorderDelegate, AVAudioPlayerDelegate 

• 創建用於錄制音頻和播放音頻的按鈕，以及用於顯示錄制時間的標簽，並為出口和動作指定start_recording，play_recording並聲明一些變量，稍后我們將使用它們

   @IBOutlet var recordingTimeLabel: UILabel! @IBOutlet var record_btn_ref: UIButton! @IBOutlet var play_btn_ref: UIButton! var audioRecorder: AVAudioRecorder! var audioPlayer : AVAudioPlayer! var meterTimer:Timer! var isAudioRecordingGranted: Bool! var isRecording = false var isPlaying = false 

• 在viewDidLoad中檢查記錄權限

   override func viewDidLoad() { super.viewDidLoad() check_record_permission() } func check_record_permission() { switch AVAudioSession.sharedInstance().recordPermission() { case AVAudioSessionRecordPermission.granted: isAudioRecordingGranted = true break case AVAudioSessionRecordPermission.denied: isAudioRecordingGranted = false break case AVAudioSessionRecordPermission.undetermined: AVAudioSession.sharedInstance().requestRecordPermission({ (allowed) in if allowed { self.isAudioRecordingGranted = true } else { self.isAudioRecordingGranted = false } }) break default: break } } 

• 生成要將記錄另存為myRecording.m4a的路徑

   func getDocumentsDirectory() -> URL { let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask) let documentsDirectory = paths[0] return documentsDirectory } func getFileUrl() -> URL { let filename = "myRecording.m4a" let filePath = getDocumentsDirectory().appendingPathComponent(filename) return filePath } 

• 設置錄音機

   func setup_recorder() { if isAudioRecordingGranted { let session = AVAudioSession.sharedInstance() do { try session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker) try session.setActive(true) let settings = [ AVFormatIDKey: Int(kAudioFormatMPEG4AAC), AVSampleRateKey: 44100, AVNumberOfChannelsKey: 2, AVEncoderAudioQualityKey:AVAudioQuality.high.rawValue ] audioRecorder = try AVAudioRecorder(url: getFileUrl(), settings: settings) audioRecorder.delegate = self audioRecorder.isMeteringEnabled = true audioRecorder.prepareToRecord() } catch let error { display_alert(msg_title: "Error", msg_desc: error.localizedDescription, action_title: "OK") } } else { display_alert(msg_title: "Error", msg_desc: "Don't have access to use your microphone.", action_title: "OK") } } 

• 當按鈕start_recording按下並使用updateAudioMeter顯示秒數時，開始錄制；如果開始錄制，則結束錄制

   @IBAction func start_recording(_ sender: UIButton) { if(isRecording) { finishAudioRecording(success: true) record_btn_ref.setTitle("Record", for: .normal) play_btn_ref.isEnabled = true isRecording = false } else { setup_recorder() audioRecorder.record() meterTimer = Timer.scheduledTimer(timeInterval: 0.1, target:self, selector:#selector(self.updateAudioMeter(timer:)), userInfo:nil, repeats:true) record_btn_ref.setTitle("Stop", for: .normal) play_btn_ref.isEnabled = false isRecording = true } } func updateAudioMeter(timer: Timer) { if audioRecorder.isRecording { let hr = Int((audioRecorder.currentTime / 60) / 60) let min = Int(audioRecorder.currentTime / 60) let sec = Int(audioRecorder.currentTime.truncatingRemainder(dividingBy: 60)) let totalTimeString = String(format: "%02d:%02d:%02d", hr, min, sec) recordingTimeLabel.text = totalTimeString audioRecorder.updateMeters() } } func finishAudioRecording(success: Bool) { if success { audioRecorder.stop() audioRecorder = nil meterTimer.invalidate() print("recorded successfully.") } else { display_alert(msg_title: "Error", msg_desc: "Recording failed.", action_title: "OK") } } 

• 播放錄音

   func prepare_play() { do { audioPlayer = try AVAudioPlayer(contentsOf: getFileUrl()) audioPlayer.delegate = self audioPlayer.prepareToPlay() } catch{ print("Error") } } @IBAction func play_recording(_ sender: Any) { if(isPlaying) { audioPlayer.stop() record_btn_ref.isEnabled = true play_btn_ref.setTitle("Play", for: .normal) isPlaying = false } else { if FileManager.default.fileExists(atPath: getFileUrl().path) { record_btn_ref.isEnabled = false play_btn_ref.setTitle("pause", for: .normal) prepare_play() audioPlayer.play() isPlaying = true } else { display_alert(msg_title: "Error", msg_desc: "Audio file is missing.", action_title: "OK") } } } 

• 錄制完成后，啟用播放按鈕；播放完成后，啟用錄制按鈕

   func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) { if !flag { finishAudioRecording(success: false) } play_btn_ref.isEnabled = true } func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) { record_btn_ref.isEnabled = true } 

• 通用顯示警報功能

   func display_alert(msg_title : String , msg_desc : String ,action_title : String) { let ac = UIAlertController(title: msg_title, message: msg_desc, preferredStyle: .alert) ac.addAction(UIAlertAction(title: action_title, style: .default) { (result : UIAlertAction) -> Void in _ = self.navigationController?.popViewController(animated: true) }) present(ac, animated: true) } 

Answer 3

@codester的答案的Swift2版本。

func record() {
    //init
    let audioSession:AVAudioSession = AVAudioSession.sharedInstance()

    //ask for permission
    if (audioSession.respondsToSelector("requestRecordPermission:")) {
        AVAudioSession.sharedInstance().requestRecordPermission({(granted: Bool)-> Void in
            if granted {
                print("granted")

                //set category and activate recorder session
                try! audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
                try! audioSession.setActive(true)


                //get documnets directory
                let documentsDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
                let fullPath = documentsDirectory.stringByAppendingPathComponent("voiceRecording.caf")
                let url = NSURL.fileURLWithPath(fullPath)

                //create AnyObject of settings
                let settings: [String : AnyObject] = [
                    AVFormatIDKey:Int(kAudioFormatAppleIMA4), //Int required in Swift2
                    AVSampleRateKey:44100.0,
                    AVNumberOfChannelsKey:2,
                    AVEncoderBitRateKey:12800,
                    AVLinearPCMBitDepthKey:16,
                    AVEncoderAudioQualityKey:AVAudioQuality.Max.rawValue
                ]

                //record
                try! self.audioRecorder = AVAudioRecorder(URL: url, settings: settings)

            } else{
                print("not granted")
            }
        })
    }

}

Answer 4

除了以前的答案外，我嘗試使其在Xcode 7.2上運行，並且之后通過電子郵件發送文件時也聽不到任何聲音。 沒有警告或異常。 因此，我將設置更改為以下內容並存儲為.m4a文件。

let recordSettings = [AVSampleRateKey : NSNumber(float: Float(44100.0)),
    AVFormatIDKey : NSNumber(int: Int32(kAudioFormatMPEG4AAC)),
    AVNumberOfChannelsKey : NSNumber(int: 1),
    AVEncoderAudioQualityKey : NSNumber(int: Int32(AVAudioQuality.Medium.rawValue))]

之后，我可以聽聲音了。 為了保存文件，我在viewDidLoad上添加了它以初始化記錄器：

let audioSession = AVAudioSession.sharedInstance()
    do {
        try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
        try audioRecorder = AVAudioRecorder(URL: self.directoryURL()!,
            settings: recordSettings)
        audioRecorder.prepareToRecord()
    } catch {
    }

並用於創建目錄：

func directoryURL() -> NSURL? {
    let fileManager = NSFileManager.defaultManager()
    let urls = fileManager.URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)
    let documentDirectory = urls[0] as NSURL
    let soundURL = documentDirectory.URLByAppendingPathComponent("sound.m4a")
    return soundURL 
}

我還添加了用於開始錄制，停止和播放之后的操作

@IBAction func doRecordAction(sender: AnyObject) {
    if !audioRecorder.recording {
        let audioSession = AVAudioSession.sharedInstance()
        do {
            try audioSession.setActive(true)
            audioRecorder.record()
        } catch {
        }
   }
}
@IBAction func doStopRecordingAction(sender: AnyObject) {
    audioRecorder.stop()
    let audioSession = AVAudioSession.sharedInstance()

    do {
        try audioSession.setActive(false)
    } catch {
    }
}

@IBAction func doPlayAction(sender: AnyObject) {
    if (!audioRecorder.recording){
        do {
            try audioPlayer = AVAudioPlayer(contentsOfURL: audioRecorder.url)
            audioPlayer.play()
        } catch {
        }
    }
}

Answer 5

這是用Swift 4.2編寫的具有簡單界面的錄音機。

final class AudioRecorderImpl: NSObject {
  private let session = AVAudioSession.sharedInstance()
  private var player: AVAudioPlayer?
  private var recorder: AVAudioRecorder?
  private lazy var permissionGranted = false
  private lazy var isRecording = false
  private lazy var isPlaying = false
  private var fileURL: URL?
  private let settings = [
    AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
    AVSampleRateKey: 44100,
    AVNumberOfChannelsKey: 2,
    AVEncoderAudioQualityKey:AVAudioQuality.high.rawValue
  ]

  override init() {
    fileURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("note.m4a")
  }

  func record(to url: URL?) {
    guard permissionGranted,
      let url = url ?? fileURL else { return }

    setupRecorder(url: url)

    if isRecording {
      stopRecording()
    }

    isRecording = true
    recorder?.record()
  }

  func stopRecording() {
    isRecording = false
    recorder?.stop()
    try? session.setActive(false)
  }

  func play(from url: URL?) {
    guard let url = url ?? fileURL else { return }

    setupPlayer(url: url)

    if isRecording {
      stopRecording()
    }

    if isPlaying {
      stopPlaying()
    }

    if FileManager.default.fileExists(atPath: url.path) {
      isPlaying = true
      setupPlayer(url: url)
      player?.play()
    }
  }

  func stopPlaying() {
    player?.stop()
  }

  func pause() {
    player?.pause()
  }

  func resume() {
    if player?.isPlaying == false {
      player?.play()
    }
  }

  func checkPermission(completion: ((Bool) -> Void)?) {
    func assignAndInvokeCallback(_ granted: Bool) {
      self.permissionGranted = granted
      completion?(granted)
    }

    switch session.recordPermission {
    case .granted:
      assignAndInvokeCallback(true)

    case .denied:
      assignAndInvokeCallback(false)

    case .undetermined:
      session.requestRecordPermission(assignAndInvokeCallback)
    }
  }
}

extension AudioRecorderImpl: AVAudioRecorderDelegate, AVAudioPlayerDelegate {

}

private extension AudioRecorderImpl {
  func setupRecorder(url: URL) {
    guard
      permissionGranted else { return }
    try? session.setCategory(.playback, mode: .default)
    try? session.setActive(true)
    let settings = [
      AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
      AVSampleRateKey: 44100,
      AVNumberOfChannelsKey: 2,
      AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
    ]
    recorder = try? AVAudioRecorder(url: url, settings: settings)
    recorder?.delegate = self
    recorder?.isMeteringEnabled = true
    recorder?.prepareToRecord()
  }

  func setupPlayer(url: URL) {
    player = try? AVAudioPlayer(contentsOf: url)
    player?.delegate = self
    player?.prepareToPlay()
  }
}

Answer 6

Swift 3代碼版本：完整的音頻錄制解決方案！

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioRecorderDelegate {

    //Outlets
    @IBOutlet weak var recordingTimeLabel: UILabel!

    //Variables
    var audioRecorder: AVAudioRecorder!
    var meterTimer:Timer!
    var isAudioRecordingGranted: Bool!


    override func viewDidLoad() {
        super.viewDidLoad()

        switch AVAudioSession.sharedInstance().recordPermission() {
        case AVAudioSessionRecordPermission.granted:
            isAudioRecordingGranted = true
            break
        case AVAudioSessionRecordPermission.denied:
            isAudioRecordingGranted = false
            break
        case AVAudioSessionRecordPermission.undetermined:
            AVAudioSession.sharedInstance().requestRecordPermission() { [unowned self] allowed in
                DispatchQueue.main.async {
                    if allowed {
                        self.isAudioRecordingGranted = true
                    } else {
                        self.isAudioRecordingGranted = false
                    }
                }
            }
            break
        default:
            break
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

        audioRecorder = nil
    }

    //MARK:- Audio recorder buttons action.
    @IBAction func audioRecorderAction(_ sender: UIButton) {

        if isAudioRecordingGranted {

            //Create the session.
            let session = AVAudioSession.sharedInstance()

            do {
                //Configure the session for recording and playback.
                try session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker)
                try session.setActive(true)
                //Set up a high-quality recording session.
                let settings = [
                    AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                    AVSampleRateKey: 44100,
                    AVNumberOfChannelsKey: 2,
                    AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
                ]
                //Create audio file name URL
                let audioFilename = getDocumentsDirectory().appendingPathComponent("audioRecording.m4a")
                //Create the audio recording, and assign ourselves as the delegate
                audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)
                audioRecorder.delegate = self
                audioRecorder.isMeteringEnabled = true
                audioRecorder.record()
                meterTimer = Timer.scheduledTimer(timeInterval: 0.1, target:self, selector:#selector(self.updateAudioMeter(timer:)), userInfo:nil, repeats:true)
            }
            catch let error {
                print("Error for start audio recording: \(error.localizedDescription)")
            }
        }
    }

    @IBAction func stopAudioRecordingAction(_ sender: UIButton) {

        finishAudioRecording(success: true)

    }

    func finishAudioRecording(success: Bool) {

        audioRecorder.stop()
        audioRecorder = nil
        meterTimer.invalidate()

        if success {
            print("Recording finished successfully.")
        } else {
            print("Recording failed :(")
        }
    }

    func updateAudioMeter(timer: Timer) {

        if audioRecorder.isRecording {
            let hr = Int((audioRecorder.currentTime / 60) / 60)
            let min = Int(audioRecorder.currentTime / 60)
            let sec = Int(audioRecorder.currentTime.truncatingRemainder(dividingBy: 60))
            let totalTimeString = String(format: "%02d:%02d:%02d", hr, min, sec)
            recordingTimeLabel.text = totalTimeString
            audioRecorder.updateMeters()
        }
    }

    func getDocumentsDirectory() -> URL {

        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        let documentsDirectory = paths[0]
        return documentsDirectory
    }

    //MARK:- Audio recoder delegate methods
    func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {

        if !flag {
            finishAudioRecording(success: false)
        }
    }
}

Answer 7

使用Swift 4編寫類文件中的代碼

類別為AGAudioRecorder

代碼是

class AudioRecordViewController: UIViewController {

    @IBOutlet weak var recodeBtn: UIButton!
    @IBOutlet weak var playBtn: UIButton!

    var state: AGAudioRecorderState = .Ready

    var recorder: AGAudioRecorder = AGAudioRecorder(withFileName: "TempFile")

    override func viewDidLoad() {
        super.viewDidLoad()

        recodeBtn.setTitle("Recode", for: .normal)
        playBtn.setTitle("Play", for: .normal)
        recorder.delegate = self
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func recode(_ sender: UIButton) {
        recorder.doRecord()
    }

    @IBAction func play(_ sender: UIButton) {
        recorder.doPlay()
    }
}

extension AudioRecordViewController: AGAudioRecorderDelegate {
    func agAudioRecorder(_ recorder: AGAudioRecorder, withStates state: AGAudioRecorderState) {
        switch state {
        case .error(let e): debugPrint(e)
        case .Failed(let s): debugPrint(s)

        case .Finish:
            recodeBtn.setTitle("Recode", for: .normal)

        case .Recording:
            recodeBtn.setTitle("Recoding Finished", for: .normal)

        case .Pause:
            playBtn.setTitle("Pause", for: .normal)

        case .Play:
            playBtn.setTitle("Play", for: .normal)

        case .Ready:
            recodeBtn.setTitle("Recode", for: .normal)
            playBtn.setTitle("Play", for: .normal)
            refreshBtn.setTitle("Refresh", for: .normal)
        }
        debugPrint(state)
    }

    func agAudioRecorder(_ recorder: AGAudioRecorder, currentTime timeInterval: TimeInterval, formattedString: String) {
        debugPrint(formattedString)
    }
}

Answer 8

對於Swift 5 ，

 func setup_recorder()
{
    if isAudioRecordingGranted
    {
        let session = AVAudioSession.sharedInstance()
        do
        {
            try session.setCategory(.playAndRecord, mode: .default)
            try session.setActive(true)
            let settings = [
                AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                AVSampleRateKey: 44100,
                AVNumberOfChannelsKey: 2,
                AVEncoderAudioQualityKey:AVAudioQuality.high.rawValue
            ]
            audioRecorder = try AVAudioRecorder(url: getFileUrl(), settings: settings)
            audioRecorder.delegate = self
            audioRecorder.isMeteringEnabled = true
            audioRecorder.prepareToRecord()
        }
        catch let error {
            display_alert(msg_title: "Error", msg_desc: error.localizedDescription, action_title: "OK")
        }
    }
    else
    {
        display_alert(msg_title: "Error", msg_desc: "Don't have access to use your microphone.", action_title: "OK")
    }

Answer 9

簡單的 2022 語法，在 iPhone 上錄制音頻。

較舊的答案不起作用。

需要...

var mic: AVAudioRecorder?

var workingFile: URL {
    return FileManager.default.temporaryDirectory.appendingPathComponent("temp.m4a")
}

接着

@IBAction public func tapTalkSend() {
    switch AVCaptureDevice.authorizationStatus(for: .audio) {
    case .authorized: _talkSend()
    case .notDetermined:
        AVCaptureDevice.requestAccess(for: .video) {  [weak self] granted in
            if granted { self?._talkSend() }
        }
    case .denied: return
    case .restricted: return
    @unknown default:
        return
    }
}

接着

public func _talkSend() {
    if mic != nil && mic!.isRecording {
        mic?.stop()
        mic = nil
        return
    }
    do {
        try AVAudioSession.sharedInstance().setCategory(.playAndRecord, mode: .default)
        try AVAudioSession.sharedInstance().setActive(true)
        mic = try AVAudioRecorder(url: workingFile, settings: [:])
    }
    catch let error {
        return print("mic drama \(error)")
    }
    
    mic!.delegate = self
    mic!.record()
}

在你的 vc 上添加AVAudioRecorderDelegate 。 和：

func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
    _testPlay() ...
    _sendFileSomewhere() ...
}
func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
    print("audioRecorderEncodeErrorDidOccur")
}

通過回放進行測試：

var myPlayer: AVAudioPlayer!

func _testPlay() {
    do {
        myPlayer = try AVAudioPlayer(contentsOf: workingFile)
        myPlayer.prepareToPlay()
        myPlayer.play()
    }
    catch let error {
        return print("play drama \(error)")
    }
}

在你的列表中：

<key>NSCameraUsageDescription</key>
<string>For spoken messages.</string>
<key>NSMicrophoneUsageDescription</key>
<string>For spoken messages.</string>