swift - AVAudioRecorder从不录音

Question

我正在使用 AVAudioRecorder 来录制人声。我的代码如下:

// Property of Class
var recorder:AVAudioRecorder?

func recordButtonTapped() {
    let audioSession = AVAudioSession.sharedInstance()
    do {
        try audioSession.setCategory(AVAudioSessionCategoryRecord)
        try audioSession.setActive(true)
        if audioSession.recordPermission() != .granted {
            audioSession.requestRecordPermission({ (success) in
                self.startRecording()
            })
        }
        else {
            self.startRecording()
        }

    } catch {
        print("Unable To Set Category")
    }
}

func startRecording() {
    // libraryPathWith(media) just gets the path to the documents directory
    // Like so: Documents/MediaLibrary/Audio/<mediaID>.<mediaExtension>
    if let path = MMFileManager.libraryPathWith(media: self.media) {
        isRecording = true
        do {
            let settings = [
                AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                AVSampleRateKey: 44100,
                AVNumberOfChannelsKey: 1,
                AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
            ]

            recorder = try AVAudioRecorder(url: path, settings: settings)

            recorder?.delegate = self

            if recorder!.prepareToRecord() {
                recorder?.record()
            }
        }
        catch {
            isRecording = false
        }
    }
}

func stopRecording() {
    self.recordingLabel.text = "Recording Complete"
    self.recordingLabel.textColor = UIColor.white
    if let rec = recorder {
        rec.stop()
        recorder = nil
    }
    isRecording = false
}

<小时/>

AVAudioRecorderDelegate

func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
    print("RECORDED AUDIO SUCCESSFULLY \(flag)")
}
func audioRecorderEncodeErrorDidOccur(_ recorder: AVAudioRecorder, error: Error?) {
    print("AUDIO RECORDER ERROR \(error?.localizedDescription)")
}

<小时/>

在 AVAudioRecorder 上调用 stop 后，audioRecorderEncodeErrorDidOccur 函数永远不会被调用，但 audioRecorderDidFinishRecording 函数会被调用，但 flag 始终为 假。它打印出“RECORDED AUDIO SUCCESSFULLY false”

问题

当我使用上面的代码进行录制时，我确实将文件保存到指定位置的文档目录中。但这个文件不是我可以播放的。它写入一个文本文件，而不是音频文件，因为我将扩展名指定为 .aac。

为什么AVAudioRecorder不录制音频？我怎样才能做到这一点？

Answer 1

我就是这样做的，首先导入

AVFoundation

并将 AVAudioRecorderDelegate 添加到您的 ViewController:

class RecordViewController: UIViewController, AVAudioRecorderDelegate

然后创建 AVAudioRecorder 的全局实例:

var audioRecorder : AVAudioRecorder!

然后我创建了一个开始录制的录制按钮:

@IBAction func playButton(_ sender: Any) {

    let dirPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
    let recordingName = "voiceRecording.wav"
    let pathArray = [dirPath, recordingName]
    let filePath = URL(string: pathArray.joined(separator: "/"))

    let session = AVAudioSession.sharedInstance()
    try! session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker)

    try! audioRecorder = AVAudioRecorder(url: filePath!, settings: [:])
    audioRecorder.delegate = self
    audioRecorder.isMeteringEnabled = true
    audioRecorder.prepareToRecord()
    audioRecorder.record()
}

dirPath 查找存储图像的目录。

recordingName将设置实际录制文件的名称

文件路径结合了最终位置的目录和录制名称

其余部分几乎是不言自明的。

然后创建一个更简单的暂停按钮:

@IBAction func pauseButton(_ sender: Any) {

    audioRecorder.stop()
    let audioSession = AVAudioSession.sharedInstance()
    try! audioSession.setActive(false)
}

这应该可以解决您如何录制音频的问题。