fixes in camera for previewer

MiniScanner/Modules/DocumentPreview/DocumentPreviewViewController.swift

@@ -35,8 +35,6 @@ final class DocumentPreviewViewController: UIViewController {
     
     override func viewDidLoad() {
         super.viewDidLoad()
-        
-        // Do any additional setup after loading the view.
         pdfView.accessibilityIdentifier = "pdfView"
         navigationItem.title = file?.displayName
         pdfView.setDocument(file?.pdfDocument)

MiniScanner/Supporting Files/CustomWeScan/Scan/ScannerViewController.swift

@@ -119,6 +119,12 @@ public final class ScannerViewController: UIViewController {
         return flashButton
     }()
     
+    lazy private var cancelBarButton: UIBarButtonItem = {
+        let cancelBarButton = UIBarButtonItem(title: "Cancel", style: .done, target: self, action: #selector(cancelTapped))
+        cancelBarButton.tintColor = .white
+        return cancelBarButton
+    }()
+    
     lazy private var activityIndicator: UIActivityIndicatorView = {
         let activityIndicator = UIActivityIndicatorView(style: .gray)
         activityIndicator.hidesWhenStopped = true
@@ -228,7 +234,11 @@ public final class ScannerViewController: UIViewController {
     }
     
     private func setupNavigationBar() {
+        if isAddedToPDF {
+            navigationItem.setLeftBarButtonItems([cancelBarButton, flashButton], animated: false)
+        } else {
             navigationItem.setLeftBarButton(flashButton, animated: false)
+        }
         navigationItem.setRightBarButton(autoScanButton, animated: false)
         
         if UIImagePickerController.isFlashAvailable(for: .rear) == false {
@@ -424,6 +434,10 @@ public final class ScannerViewController: UIViewController {
         }
     }
     
+    @objc private func cancelTapped() {
+        self.navigationController?.popViewController(animated: true)
+    }
+    
     @objc private func cancelImageScannerController() {
         self.navigationController?.popViewController(animated: true)
     }