用户说话时自动开始录音

Question

我正在尝试在用户开始说话时开始录制，并在用户完成讲话时停止录制。我想限制最大录制音频长度。我无法在AVAudioRecorderDelegate中找到足够的功能。希望您理解我的问题。提前致谢

@IBAction func recordAudio(_ sender: Any) {
recordingLabel.text = "Recording in progress..."
let dirPath = NSSearchPathForDirectoriesInDomains(.documentDirectory,.userDomainMask, true)[0] as String
let recordingName = "recordedVoice.wav"
let pathArray = [dirPath, recordingName]
let filePath = URL(string: pathArray.joined(separator: "/"))
let session = AVAudioSession.sharedInstance()
try! session.setCategory(AVAudioSessionCategoryPlayAndRecord, with:AVAudioSessionCategoryOptions.defaultToSpeaker)
try! audioRecorder = AVAudioRecorder(url: filePath!, settings: [:])
audioRecorder.delegate = self
audioRecorder.isMeteringEnabled = true
audioRecorder.prepareToRecord()
audioRecorder.record()
}
@IBAction func stopRecording(_ sender: Any) {
recordButton.isEnabled = true
stopRecordingButton.isEnabled = false
recordingLabel.text = "Tap to record..."
audioRecorder.stop()
let audioSession = AVAudioSession.sharedInstance()
try! audioSession.setActive(false)
}
func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
if (flag) {
//Success
} else {
print("Could not save audio recording!")
}
}

Answer 1

录制音频 当用户 tak1 时，您需要一些步骤

1.用户允许所有应用程序使用麦克风

在信息列表中添加用户列表Privacy - Microphone Usage Description并添加文本说明

2.保存录制文件用户FileManager的位置

3.在时间之后结束：使用audioRecorder.record(forDuration: 30) // record for 30 Sec

检查完整代码：

import UIKit
import AVFoundation
class ViewController: UIViewController  {
@IBOutlet weak var recordButton: UIButton!
var recordingSession: AVAudioSession!
var audioRecorder: AVAudioRecorder!

override func viewDidLoad() {
super.viewDidLoad()
}
@IBAction func recordAudio(_ sender: Any) {
self.requestRecordPermission()
}
func requestRecordPermission() {
recordingSession = AVAudioSession.sharedInstance()
do {
try recordingSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
try recordingSession.setActive(true)
recordingSession.requestRecordPermission() { [unowned self] allowed in
DispatchQueue.main.async {
if allowed {
// User allow you to record
// Start recording and change UIbutton color
self.recordButton.backgroundColor = .red
self.startRecording()
} else {
// failed to record!
}
}
}
} catch {
// failed to record!
}
}
func startRecording() {
let audioFilename = getDocumentsDirectory().appendingPathComponent("recordedFile.m4a")
let settings = [
AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
AVSampleRateKey: 12000,
AVNumberOfChannelsKey: 1,
AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
]
do {
audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)
audioRecorder.delegate = self
audioRecorder.record(forDuration: 30)  // record for 30 Sec
recordButton.setTitle("Tap to Stop", for: .normal)
recordButton.backgroundColor = .green
} catch {
finishRecording(success: false)
}
}
func getDocumentsDirectory() -> URL {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
return paths[0]
}
@objc func recordTapped() {
if audioRecorder == nil {
startRecording()
} else {
finishRecording(success: true)
}
}
public func finishRecording(success: Bool) {
audioRecorder.stop()
audioRecorder = nil
if success {
// record sucess
recordButton.backgroundColor = .green
} else {
// record fail
recordButton.backgroundColor = .yellow
}
}
}

extension ViewController :AVAudioRecorderDelegate{

func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
if !flag {
finishRecording(success: false)
}
}
}