Swift運行時錯誤（exc_bad_access）AVAudioRecorder，recordSettings

Question

我一直在努力改變一段代碼，用於將音頻從swift 1.2錄製到swift 2.在這裏的人們的幫助下，我做了一些改變，最終擺脫了所有編譯器錯誤。但是現在，在我運行代碼之後，登錄到Twitter，然後單擊模擬器中的Record按鈕，它崩潰並給我一個運行時錯誤。請在這裏看到的畫面：

此外，我不知道這是很重要的或沒有，但我刪除從代碼「AVFormatIDKey：：（的Int32（kAudioFormatAppleLossless）INT）的NSNumber」的評論從代碼中刪除「self.audioRecorder.meteringEnabled = true」和「self.audioRecorder.prepareToRecord（）」，並且它不再崩潰，但顯然這不是代碼應該如何運行在最後......

以下是完整版本的代碼。對此有何想法？

非常感謝您的幫助

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

我看到一個有力展開可選。將您的錯誤處理更換爲以下內容

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

Answer 2

謝謝Eric和Lukas。我對整個代碼進行了一些修改，畢竟我猜想我已經完成了它。現在，它編譯沒有錯誤，也不會造成運行時崩潰。我只是發佈了我的工作代碼的最終版本，以便如果其他人遇到類似的問題，他們可以使用它。

再次感謝所有在Stackoverflow上貢獻的傑出人物。

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) { 
} 

}