Swift 运行时错误 (exc_bad_access) AVAudioRecorder, recordSettings

Question

我一直在努力将一段用于录制音频的代码从 swift 1.2 更改为 swift 2。在这里的人们的帮助下，我做了一些更改，最终摆脱了所有编译器错误。但是现在，在我运行代码后，登录 Twitter，然后单击模拟器中的 Record 按钮，它崩溃并给我一个运行时错误。请看这里的图片：

另外，我不确定这是否重要，但我从代码中删除了“AVFormatIDKey : NSNumber(int: Int32(kAudioFormatAppleLossless))”并注释掉了“self.audioRecorder.meteringEnabled = true”和“ self.audioRecorder.prepareToRecord()" 从代码中，它不再崩溃，但显然这不是代码应该在最后运行的方式......

这是完整版的代码。对此有什么想法吗？

非常感谢您的帮助

import UIKit
import AVFoundation

class RecordViewController: UIViewController {

required init?(coder aDecoder: NSCoder) {


    var baseString : String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as String
    self.audioURL = "sound.m4a"
    var pathComponents = [baseString, self.audioURL]
    var audioNSURL = NSURL.fileURLWithPathComponents(pathComponents)
    var session = AVAudioSession.sharedInstance()
    do {
        try session.setCategory(AVAudioSessionCategoryPlayAndRecord)
    } catch (_) {
    }
//        session.setCategory(AVAudioSessionCategoryPlayAndRecord, error: nil)

//        var recordSettings: [String : AnyObject] = Dictionary()
//        recordSettings[AVFormatIDKey] = kAudioFormatMPEG4AAC
//        recordSettings[AVFormatIDKey] = NSNumber(unsignedInt: kAudioFormatMPEG4AAC)
//        recordSettings[AVSampleRateKey] = 44100.0
//        recordSettings[AVNumberOfChannelsKey] = 2

    let recordSettings = [
        AVSampleRateKey : NSNumber(float: Float(44100.0)),
        AVFormatIDKey : NSNumber(int: Int32(kAudioFormatAppleLossless)),
        AVNumberOfChannelsKey : NSNumber(int: 1),
        AVEncoderAudioQualityKey : NSNumber(int: Int32(AVAudioQuality.Medium.rawValue)),
        AVEncoderBitRateKey : NSNumber(int: Int32(320000))
    ]

//        self.audioRecorder = AVAudioRecorder(URL: audioNSURL, settings: recordSettings, error: nil)
    self.audioRecorder = AVAudioRecorder()
    print("aaaaa")
    do {
        self.audioRecorder = try AVAudioRecorder(URL: audioNSURL!, settings: recordSettings)

    } catch (_) {

    }
    self.audioRecorder.meteringEnabled = true
    self.audioRecorder.prepareToRecord()


    super.init(coder: aDecoder)
}
//    required init(coder aDecoder: NSCoder!) {
//        super.init(coder : aDecoder)
//        self.audioRecorder = AVAudioRecorder()
//    }

@IBOutlet weak var recordButton: UIButton!
@IBOutlet weak var playButton: UIButton!
@IBOutlet weak var saveButton: UIBarButtonItem!

var audioRecorder : AVAudioRecorder
var audioURL = ""

override func viewDidLoad() {
    super.viewDidLoad()

    self.playButton.enabled = false
    self.saveButton.enabled = false

    // Do any additional setup after loading the view.
}



@IBAction func cancelTapped(sender: AnyObject) {
    self.dismissViewControllerAnimated(true, completion: nil)
}

@IBAction func saveTapped(sender: AnyObject) {
}

@IBAction func recordTapped(sender: AnyObject) {
    self.playButton.enabled = true
}

@IBAction func playTapped(sender: AnyObject) {
}

}

Answer 1

我看到一个强制展开的可选选项。用以下内容替换您的错误处理

if let url = audioNSURL {
        self.audioRecorder = try? AVAudioRecorder(URL: url, settings: recordSettings)
} 

Answer 2

感谢 Eric 和 Lukas。我对我的整个代码做了一些进一步的修改，毕竟我想我让它工作了。现在，它编译没有错误，也没有运行时崩溃。我只是发布我的工作代码的最终版本，以便如果其他人遇到类似问题，他们可以使用它。

再次感谢所有在 Stackoverflow 上做出贡献的优秀人员。

import UIKit
import AVFoundation

class RecordViewController: UIViewController {

var audioRecorder : AVAudioRecorder?

@IBOutlet weak var recordButton: UIButton!
@IBOutlet weak var playButton: UIButton!
@IBOutlet weak var saveButton: UIBarButtonItem!

override func viewDidLoad() {
    super.viewDidLoad()
    self.playButton.enabled = false
    self.saveButton.enabled = false
}

func setRecorder() {

    do {
        let baseString : String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true).first!
        let pathComponents = [baseString, "music.m4a"]
        let audioURL = NSURL.fileURLWithPathComponents(pathComponents)

        let session = AVAudioSession.sharedInstance()
        try session.setCategory(AVAudioSessionCategoryPlayAndRecord)
        try session.overrideOutputAudioPort(AVAudioSessionPortOverride.Speaker)
        try session.setActive(true)

        var recordSettings = [String : AnyObject]()
        recordSettings[AVFormatIDKey] = Int(kAudioFormatMPEG4AAC)
        recordSettings[AVSampleRateKey] = 44100.0
        recordSettings[AVNumberOfChannelsKey] = 2

        self.audioRecorder = try AVAudioRecorder(URL: audioURL!, settings: recordSettings)
        self.audioRecorder!.meteringEnabled = true
        self.audioRecorder!.prepareToRecord()
    } catch (_) {
    }
}

@IBAction func cancelTapped(sender: AnyObject) {
    self.dismissViewControllerAnimated(true, completion: nil)
}

@IBAction func saveTapped(sender: AnyObject) {
}

@IBAction func recordTapped(sender: AnyObject) {
    self.playButton.enabled = true
}

@IBAction func playTapped(sender: AnyObject) {
}

}