Xcode音频应用程序错误线程1：EXC_BAD_ACCESS（代码= 1，地址= 0x0）

Question

我正在开发一个应用程序，正在尝试使用音频，但是启动应用程序并开始录制音频时出现错误消息。

  

错误：线程1：第45-46行的EXC_BAD_ACCESS（代码= 1，地址= 0x0）（尝试！audioRecorder = AVAudioRecorder（url：filePath !，设置：[：]）

import UIKit
import AVFoundation

class RecordSoundsViewController: UIViewController, AVAudioRecorderDelegate {

    var audioRecorder = AVAudioRecorder()

    @IBOutlet weak var recordingLabel: UILabel!
    @IBOutlet weak var recordingButton: UIButton!
    @IBOutlet weak var stopRecoding: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        stopRecoding.isEnabled = false
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        print("It loaded")
    }


    @IBAction func recordAudio(_ sender: AnyObject){
        recordingLabel.text = "Recording in Progress"
        stopRecoding.isEnabled = true
        recordingButton.isEnabled = false

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

        let session = AVAudioSession.sharedInstance()
        try! session.setCategory(AVAudioSession.Category.playAndRecord, mode: AVAudioSession.Mode.default, options: AVAudioSession.CategoryOptions.defaultToSpeaker)

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

    }
    @IBAction func stopRecord(_ sender: Any) {
        stopRecoding.isEnabled = false
        recordingButton.isEnabled = true
        recordingLabel.text = "Tap to Record"
        audioRecorder.stop()
        let audioSession = AVAudioSession.sharedInstance()
        try! audioSession.setActive(false)
    }

}