Question

我正在使用AVAudioRecorder在视频中录制音频。当我按“开始”按钮开始录制时，会有很长的延迟，有时会长达6秒才开始录音。然后，录制不成功，并以0.0秒的时间出现在文件中。

**** 帖子已被编辑，以尝试使问题更清晰

我创建了一个示例音频录制项目，我要做的就是尝试录制音频，但对我来说仍然无效。我的代码如下：

import UIKit
import AVFoundation

class ViewController: UIViewController, AVAudioRecorderDelegate {

    var recordingSession: AVAudioSession!
    var audioRecorder: AVAudioRecorder!
    var settings = [String : Int]()
    var outputAudioLocation: URL!

    @IBOutlet weak var startButton: UIButton!
    @IBOutlet weak var stopButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        //setUpAudioSession()

        recordingSession = AVAudioSession.sharedInstance()
        do {
            try recordingSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
            try recordingSession.setActive(true)
            recordingSession.requestRecordPermission { (hasPermission) in
            if hasPermission {
                print("Accepted")
            } else {
                print("Not allowed")
            }
        }
            print("audio set up")
        } catch {
            print("Recording session error")
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


    @IBAction func startButtonPressed(_ sender: Any) {
        recordAudio()
    }

    @IBAction func stopButtonPressed(_ sender: Any) {
        stopRecordingAudio()
    }

    func recordAudio() {
        // Check if we have an active recorder
        if audioRecorder == nil {

            outputAudioLocation = getDirectory().appendingPathComponent("audio.m4a")

            settings = [AVFormatIDKey: Int(kAudioFormatMPEG4AAC),
                        AVSampleRateKey: 44100,
                        AVNumberOfChannelsKey: 2,
                        AVEncoderAudioQualityKey: AVAudioQuality.high.rawValue
            ]

            // Start Audio Recording
            do {
                audioRecorder = try AVAudioRecorder(url: outputAudioLocation, settings: settings)
                audioRecorder.delegate = self
                audioRecorder.record()
                print("audio recording")
            } catch {
                print("Audio recording hasn't worked")
            }
        }
    }

    func stopRecordingAudio() {
        if audioRecorder != nil {
            audioRecorder.stop()
            print("audio stopped recording")
            audioRecorder = nil
        }
    }

    //directory for audio recording
    func getDirectory() -> URL {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        let documentDirectory = paths[0]
        return documentDirectory
    }


    func audioRecorderDidFinishRecording(_ recorder: AVAudioRecorder, successfully flag: Bool) {
        if !flag {
            print("audio recording successful")
        } else {
            print("audio recording not successful")
        }
    }

}

****更新

我已经下载了一个使用AVAudioRecorder的GitHub项目，当我在iPhone 6的手机上尝试该录音时，该录音无法正常工作，并且保存时间为0.0。但是，当我使用模拟器（iPhone 8）时，它可以按预期工作。有谁知道为什么这会在我的手机上发生？通过我自己的项目，到今天为止一切正常。

Answer 1

在浪费了我超过5个小时的时间试图找出我的代码出了什么问题之后，事实证明这是我的iPhone出现的问题。

我关闭并重新打开了手机，录音现在可以正常工作了。我从未想过那会是问题。

感谢@matt试图帮助我！

调用record（）时，AVAudioRecorder会长时间延迟

1 个答案: