lint: delete trailing whitespaces

pass/Controllers/QRScannerController.swift

@@ -17,90 +17,90 @@ protocol QRScannerControllerDelegate {
 }
 
 class QRScannerController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
-    
+
     @IBOutlet weak var scannerOutput: UILabel!
-    
+
     var captureSession: AVCaptureSession?
     var videoPreviewLayer: AVCaptureVideoPreviewLayer?
     var qrCodeFrameView: UIView?
-    
+
     let supportedCodeTypes = [AVMetadataObject.ObjectType.qr]
-    
+
     var delegate: QRScannerControllerDelegate?
-    
+
     override func viewDidLoad() {
         super.viewDidLoad()
-        
+
         if AVCaptureDevice.authorizationStatus(for: .video) == .denied {
             presentCameraSettings()
         }
-        
+
         // Get an instance of the AVCaptureDevice class to initialize a device object and provide the video as the media type parameter.
         let captureDevice = AVCaptureDevice.default(for: AVMediaType.video)
         do {
             // Get an instance of the AVCaptureDeviceInput class using the previous device object.
             let input = try AVCaptureDeviceInput(device: captureDevice!)
-            
+
             // Initialize the captureSession object.
             captureSession = AVCaptureSession()
 
             // Set the input device on the capture session.
             captureSession?.addInput(input)
-            
+
             // Initialize a AVCaptureMetadataOutput object and set it as the output device to the capture session.
             let captureMetadataOutput = AVCaptureMetadataOutput()
             captureSession?.addOutput(captureMetadataOutput)
-            
+
             // Set delegate and use the default dispatch queue to execute the call back
             captureMetadataOutput.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)
             captureMetadataOutput.metadataObjectTypes = supportedCodeTypes
-            
+
             // Initialize the video preview layer and add it as a sublayer to the viewPreview view's layer.
             videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession!)
             videoPreviewLayer?.videoGravity = AVLayerVideoGravity.resizeAspectFill
             videoPreviewLayer?.frame = view.layer.bounds
             view.layer.addSublayer(videoPreviewLayer!)
-            
+
             // Start video capture.
             captureSession?.startRunning()
-            
+
             // Move the message label to the front
             scannerOutput.layer.cornerRadius = 10
             scannerOutput.text = "No QR code detected"
             view.bringSubview(toFront: scannerOutput)
-            
+
             // Initialize QR Code Frame to highlight the QR code
             qrCodeFrameView = UIView()
-            
+
             if let qrCodeFrameView = qrCodeFrameView {
                 qrCodeFrameView.layer.borderColor = UIColor.green.cgColor
                 qrCodeFrameView.layer.borderWidth = 2
                 view.addSubview(qrCodeFrameView)
                 view.bringSubview(toFront: qrCodeFrameView)
             }
-            
+
         } catch {
             scannerOutput.text = error.localizedDescription
         }
     }
-    
+
     override func didReceiveMemoryWarning() {
         super.didReceiveMemoryWarning()
         // Dispose of any resources that can be recreated.
     }
-    
-    
+
+
     // MARK: - AVCaptureMetadataOutputObjectsDelegate Methods
-    
+
     func metadataOutput(_ captureOutput: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
-        
+
         if let metadataObj = metadataObjects.first as? AVMetadataMachineReadableCodeObject,
             supportedCodeTypes.contains(metadataObj.type),
             let barCodeObject = videoPreviewLayer?.transformedMetadataObject(for: metadataObj) {
-            
+
             // draw a bounds on the found QR code
             qrCodeFrameView?.frame = barCodeObject.bounds
-            
+
             // check whether it is a valid result
             if let scanned = metadataObj.stringValue {
                 if let (accept, message) = delegate?.checkScannedOutput(line: scanned) {
@@ -121,13 +121,13 @@ class QRScannerController: UIViewController, AVCaptureMetadataOutputObjectsDeleg
             } else {
                 scannerOutput.text = "No string value"
             }
-            
+
         } else {
             qrCodeFrameView?.frame = CGRect.zero
             scannerOutput.text = "No QR code detected"
         }
     }
-    
+
     func presentCameraSettings() {
         let alertController = UIAlertController(title: "Error",
                                                 message: "Camera access denied.\nWARNING: Toggle the camera permission resets the app! Save your changes.",
@@ -140,7 +140,7 @@ class QRScannerController: UIViewController, AVCaptureMetadataOutputObjectsDeleg
                 })
             }
         })
-        
+
         present(alertController, animated: true)
     }
 }