Swift，展开录制audio的零运行时错误

在下面的代码中，我得到一个运行时错误，你可以在这张图中看到：

它发生在我login到twitter后，按下Recordbutton，并在下一个ViewController中按下Recordbutton。 我怀疑原因是，不知何故audioRecorder是零，当解压使用！ 在“如果self.audioRecorder！.recording”，代码崩溃。 但我不明白为什么audioRecorder应该在这里零。 你们有什么想法我做错了什么？ 这里是完整的代码。 最好，

import UIKit import AVFoundation class RecordViewController: UIViewController { var audioRecorder : AVAudioRecorder? func setUpAudioRecorder() { do { let baseString : String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true).first! let pathComponents = [baseString, "sound.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 (_) { } } @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 } @IBAction func cancelTapped(sender: AnyObject) { self.dismissViewControllerAnimated(true, completion: nil) } @IBAction func saveTapped(sender: AnyObject) { } @IBAction func recordTapped(button: AnyObject) { if self.audioRecorder!.recording { self.audioRecorder!.stop() button.setTitle("Record", forState: UIControlState.Normal) } else { do{ try AVAudioSession.sharedInstance().setActive(true) self.audioRecorder!.record() button.setTitle("Stop Recording", forState: UIControlState.Normal) } catch (_) {} } self.playButton.enabled = true } @IBAction func playTapped(sender: AnyObject) { } 

}

Answer 1

哦，男孩，你是如何正确的节奏拳手。 我只是调用IBOutlet中的函数，现在它正在工作。 非常感谢您的帮助。 这是其他人感兴趣的工作代码：

 import UIKit import AVFoundation class RecordViewController: UIViewController { var audioRecorder : AVAudioRecorder? func setUpAudioRecorder() { do { let baseString : String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true).first! let pathComponents = [baseString, "sound.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 (_) { } } @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 } @IBAction func cancelTapped(sender: AnyObject) { self.dismissViewControllerAnimated(true, completion: nil) } @IBAction func saveTapped(sender: AnyObject) { } @IBAction func recordTapped(button: AnyObject) { if (self.audioRecorder?.recording == nil || !self.audioRecorder!.recording) { if (self.audioRecorder?.recording == nil) { setUpAudioRecorder() } do { try AVAudioSession.sharedInstance().setActive(true) self.audioRecorder!.record() button.setTitle("Stop Recording", forState: UIControlState.Normal) } catch (_) {} } else { self.audioRecorder!.stop() button.setTitle("Record", forState: UIControlState.Normal) } self.playButton.enabled = true } @IBAction func playTapped(sender: AnyObject) { } 

}