代碼中的按鈕並不總是執行操作的問題

我的應用程序中有一個按鈕，並且有些奇怪的時刻，有時當我點擊按鈕時，它並不總是執行所需的代碼。該應用程序不會崩潰，但如果我退出該應用程序並再次打開該按鈕將繼續不起作用。解決此問題的唯一方法是關閉手機或刪除並重新下載應用程序。代碼中的按鈕並不總是執行操作的問題

注意：這隻發生在一段時間，我不知道爲什麼。問題可能是一個約束問題嗎？這是我的按鈕的代碼。

@IBAction func recordVideoButtonPressed(_ sender: Any) { 

    if self.movieFileOutput.isRecording { 
     clipsCollectionView.reloadData() 
     self.movieFileOutput.stopRecording() 
     styleWhileNotRecording() 
     turnFlashOff() 
     stopTimer() 
    } else { 
     self.movieFileOutput.connection(withMediaType: AVMediaTypeVideo).videoOrientation = self.videoOrientation() 
     self.movieFileOutput.maxRecordedDuration = self.maxRecordedDuration() 
     self.movieFileOutput.startRecording(toOutputFileURL: URL(fileURLWithPath:self.videoFileLocation()), recordingDelegate: self) 
     styleWhileRecording() 
     turnOnFlash() 
     startTimer() 
    } 

    updateRecordButtonTitle() 

}

這是我updateRecordButton方法。這是我如何知道問題，因爲圖像並不總是更新。

func updateRecordButtonTitle() { 
    recordButton.alpha = 0 
    if !self.movieFileOutput.isRecording { 
     UIView.animate(withDuration: 0.3, animations: { 
     let stop = UIImage(named: "stopButton.png") 
     self.recordButton.setImage(stop, for: .normal) 
     self.recordButton.alpha = 1 
      }) 
    } else { 
     UIView.animate(withDuration: 0.3, animations: { 
     let start = UIImage(named: "recordImage.png") 
     self.recordButton.setImage(start, for: .normal) 
     self.recordButton.alpha = 1 
     }) 
    } 

}

更新！

我剛剛注意到，當發生此問題時，計時器也不停止。所以我假設問題在於它沒有正確讀取。任何人有任何想法，爲什麼發生這種情況？

if self.movieFileOutput.isRecording {

UPDATE

我才意識到另一個問題。我在我的委託捕獲方法中添加了打印語句。

func capture(_ captureOutput: AVCaptureFileOutput!, didStartRecordingToOutputFileAt fileURL: URL!, fromConnections connections: [Any]!) { 
    print(42332) 
} 

func capture(_ captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAt outputFileURL: URL!, fromConnections connections: [Any]!, error: Error!) { 
    cropVideo(outputFileURL) 
    print("Recording Finished") 
}

發生此問題時...打印所有這些語句。它打印

42322和錄製完成。

我意識到當它發生時會記錄視頻並立即停止。我不知道爲什麼會發生這種情況？

來源

2017-07-21 Michael Jajou

不可能知道發生了什麼事情;請設置幾個斷點並告訴我們**哪些**分支會執行（您的if/else語句）。 –

在代碼似乎不起作用的地方設置斷點？好吧，我會嘗試這個，即使這種情況發生時應用程序不會崩潰，這仍然會有幫助嗎？ –

您正試圖弄清楚發生了什麼，但信息太少。 '如果self.movieFileOutput.isRecording {...} else {...}'被執行了哪一個？是否調用updateRecordButtonTitle（）？如果是這樣，那麼執行'if！self.movieFileOutput.isRecording {...} else {...}'中的哪一個？也許IBAction沒有被稱爲開始？ –

let cameraButton: UIButton = { 
 
     let cameraButton = UIButton(type: .system) 
 
     cameraButton.setImage(#imageLiteral(resourceName: "camera").withRenderingMode(.alwaysOriginal), for: .normal) 
 
     cameraButton.translatesAutoresizingMaskIntoConstraints = false 
 
     return cameraButton 
 
    }() 
 

 

 
override func viewDidLoad() { 
 
     super.viewDidLoad() 
 
     
 
     addButtons() 
 
} 
 

 
func addButtons() { 
 
     self.view.addSubview(cameraButton) 
 
     cameraButton.bottomAnchor.constraint(equalTo: self.view.topAnchor, constant: self.view.frame.height*3/6).isActive = true 
 
     cameraButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true 
 
     cameraButton.heightAnchor.constraint(equalToConstant: 190).isActive = true 
 
     cameraButton.widthAnchor.constraint(equalToConstant: 190).isActive = true 
 
     cameraButton.addTarget(self, action: #selector(cameraTapped), for: .touchUpInside) 
 
     } 
 
     
 
func cameraTapped() { 
 
     let videoPickerController = UIImagePickerController() 
 
     videoPickerController.delegate = self 
 
     
 
     if UIImagePickerController.isSourceTypeAvailable(.camera) == false { 
 
      return 
 
     } 
 
     videoPickerController.allowsEditing = true 
 
     videoPickerController.sourceType = .camera 
 
     videoPickerController.mediaTypes = [kUTTypeMovie as String] 
 
     videoPickerController.modalPresentationStyle = .fullScreen 
 
     self.present(videoPickerController, animated: true, completion: nil) 
 
    } 
 
    
 
    // After picking a video, we dismiss the picker view controller and present the editor view controller 
 
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { 
 
     let videoURL = info["UIImagePickerControllerMediaURL"] as? URL 
 
     self.dismiss(animated: true, completion: nil) 
 
     
 
     // We create a VideoEditorViewController to play video as well as for editing purpose 
 
     let videoEditorViewController = VideoEditorViewController() 
 
     videoEditorViewController.videoURL = videoURL 
 
     videoEditorViewController.transitioningDelegate = self 
 
     self.present(videoEditorViewController, animated: true, completion: nil) 
 
    } 
 
}

來源

2017-07-21 08:25:33 YHWH

我使用此代碼來拍攝和它的完美地工作 – YHWH

代碼中的按鈕並不總是執行操作的問題

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