如何解决AVFoundation中的FlushPendingInput错误及Swift录音列表不更新问题

我是使用Swift 5.9和Xcode的初级开发者，正在基于AVFoundation搭建音频录制功能，希望每完成一段录音就生成对应的TableView单元格。但在模拟器中结束录音后，没有新单元格出现（尚未在真机测试）。代码参考了录音教程和London App Brewery的TableView教程编写。

import UIKit
import AVFoundation

class SoundSetViewController: UIViewController, AVAudioRecorderDelegate {
    //need to add table view, recording. add recoding url to list of recordings. Can use button on side to delete. Add button to delete set, and alert before doing this.
    var soundSet = SoundSet(name: "New Sound", files: [], sounds: [], recordsNumber: 0)

    var recordingSession: AVAudioSession!
    var audioRecorder: AVAudioRecorder!

    @IBOutlet var recordingButton: UIButton!
    @IBOutlet var tableView: UITableView!

    @IBAction func toggleListeningSession(_ sender: Any) {
        if  audioRecorder == nil {
            soundSet.recordsNumber += 1
            let fileName = getRecordingPath().appendingPathComponent("\(soundSet.recordsNumber).m4a") //add soundsetname once class defined
            print(fileName.absoluteString)
            soundSet.files.append(fileName)
            //do research into what settings work well
            let settings = [AVFormatIDKey: Int(kAudioFormatMPEG4AAC), AVSampleRateKey: 12000, AVNumberOfChannelsKey: 1, AVEncoderAudioQualityKey: AVAudioQuality.low.rawValue]
            //start recording
            do {
                audioRecorder = try AVAudioRecorder(url: fileName, settings: settings)
                audioRecorder.delegate = self
                audioRecorder.record()
                recordingButton.setTitle("Stop Recording", for: .normal)
            } catch {
                displayAlert(title: "Error:", message: "recording failed to start")
            } 
        }
        else {
            audioRecorder.stop()
            audioRecorder = nil
            recordingButton.setTitle("Start Recording", for: .normal)
            updateView()
        }
    }
    
    func updateView(){
        for file in soundSet.files {
            let fileName = file.lastPathComponent
            let recording = Recording(recordName: fileName, fileName: file)
            self.soundSet.sounds.append(recording)
            DispatchQueue.main.async {
                self.tableView.reloadData()
            }  
        }
    }
    
    func getRecordingPath()->URL{
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        let documentDirectory = paths[0]
        return documentDirectory
    }
    
    //alerts user if problem
    func displayAlert(title: String, message: String){
        let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "Dismiss", style: .default))
        alert.present(alert, animated: true)
    }
    
    override func viewDidLoad(){
        super.viewDidLoad()
        tableView.register(UINib(nibName: K.SoundSetConstants.cellName, bundle: nil), forCellReuseIdentifier: K.SoundSetConstants.cellIdentifier)
        recordingSession = AVAudioSession.sharedInstance()


        AVAudioApplication.requestRecordPermission { hasPermission in
            if hasPermission {
                print("has permission")
            }
        }
        updateView()
    }
}

extension SoundSetViewController: UITableViewDataSource{
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: K.SoundSetConstants.cellIdentifier, for: indexPath) as! RecordSampleCell
        cell.recordingName.text = "\(soundSet.recordsNumber)"
        print(soundSet.recordsNumber)
        return cell
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return soundSet.recordsNumber
    }
}

启动录音时控制台输出 #

file:///Users/myName/Library/Developer/CoreSimulator/Devices/2CA498B1-270C-4F83-8B25-D18C7E096D53/data/Containers/Data/Application/84C1909A-0632-4E06-AB03-20B09EA0B323/Documents/2.m4a
2024-02-23 13:16:51.367417-0500 FeedBack[34081:22683094] [AQ] AudioQueueObject.cpp:1580 BuildConverter: AudioConverterNew returned -50
from: 0 ch, 12000 Hz, .... (0x00000000) 0 bits/channel, 0 bytes/packet, 0 frames/packet, 0 bytes/frame
to: 1 ch, 12000 Hz, aac (0x00000000) 0 bits/channel, 0 bytes/packet, 1024 frames/packet, 0 bytes/frame

结束录音时控制台输出 #

2024-02-23 13:17:42.726800-0500 FeedBack[34081:22683094] [AQ] AudioQueueObject.cpp:6643 ConvertInput: aq@0x107820000: AudioConverterFillComplexBuffer returned -50, packetCount 5
2024-02-23 13:17:42.727141-0500 FeedBack[34081:22683094] [AQ] AudioQueueObject.h:2353 GetAnchorIOSampleTimeWarnIfInvalid: aq@0x107820000: ConvertInput using invalid anchor time
2024-02-23 13:17:42.727319-0500 FeedBack[34081:22683094] [AQ] AudioQueueObject.cpp:3060 FlushPendingInput: flushing pending input terminated - error -50

移除TableView后运行代码，控制台仍显示相同错误。搜索BuildConverter、AudioConverter或FlushPendingInput相关的错误-50，未找到有效解决方案。

内容的提问来源于stack exchange，提问作者Definitely-A-Person