Question

我在Udacity学习iOS课程。我不知道为什么要运行以下代码。它将在try! audioRecorder = AVAudioRecorder(url: filePath!, settings: [:])

行中显示线程1的消息：EXC_BAD_ACCESS（代码= 1，地址= 0x0）

import UIKit
import AVFoundation

class RecordViewController: UIViewController, AVAudioRecorderDelegate {

    var audioRecorder = AVAudioRecorder()


    @IBOutlet weak var recordingLabel: UITextField!
    @IBOutlet weak var recordButton: UIButton!
    @IBOutlet weak var stopRecordingButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        stopRecordingButton.isEnabled = false

        // Do any additional setup after loading the view, typically from a nib.
    }

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


    @IBAction func recordAudio(_ sender: AnyObject) {
        recordingLabel.text = "Recording in Progress"
        stopRecordingButton.isEnabled = true
        recordButton.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: "/"))

        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{
            performSegue(withIdentifier: "stopRecording", sender: audioRecorder.url)
        }else {
            print("recording wasn't successful")

        }
    }
}

Answer 1

i think you must use try like this AVAudioPlayer

var resourcePath = url  //your url
var objectData = Data(contentsOf: NSURL(string: resourcePath)!)
var error: Error!
do {
    audioPlayer = try AVAudioPlayer(objectData)
}
catch let error {
}
audioPlayer.numberOfLoops = 0
audioPlayer.volume = 1.0
audioPlayer.prepareToPlay()
if audioPlayer == nil {
    print("\(error.description)")
}
else {
    audioPlayer.play()
}

Answer 2

您使用了错误的API。

URL(string:用于表示包含完整URL的字符串，包括方案（http://，ftp://，file://）。

以斜杠开头的文件路径的正确API是URL(fileURLWithPath。

第二NSSearchPathForDirectoriesInDomains和手动连接路径组件已过时。使用与网址相关的API，这样可以解决错误。

let documentsURL = try! FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
let fileURL = documentsURL.appendingPathComponent("recordedVoice.wav")

此try!不会崩溃，因为如果不存在，操作系统将始终创建documents文件夹。

对于确实可以throw错误添加错误处理的API

do {

    try session.setCategory(AVAudioSessionCategoryPlayAndRecord, with:AVAudioSessionCategoryOptions.defaultToSpeaker)

    try audioRecorder = AVAudioRecorder(url: filePath!, settings: [:])
    audioRecorder.delegate = self
    ...

} catch { print(error) }

AVAudioRecorder线程1：EXC_BAD_ACCESS（代码= 1，地址= 0x0）

2 个答案: