Merge pull request #101 from hyperoslo/fix/stop-capturing-on-deinit

Camera: stop capturing on deinit

Author: vadymmarkov

BarcodeScanner.podspec

@@ -1,7 +1,7 @@
 Pod::Spec.new do |s|
   s.name             = "BarcodeScanner"
   s.summary          = "Simple and beautiful barcode scanner."
-  s.version          = "4.1.1"
+  s.version          = "4.1.2"
   s.homepage         = "https://github.com/hyperoslo/BarcodeScanner"
   s.license          = 'MIT'
   s.author           = { "Hyper Interaktiv AS" => "ios@hyper.no" }

Example/BarcodeScannerExample/Podfile.lock

@@ -9,8 +9,8 @@ EXTERNAL SOURCES:
     :path: ../../
 
 SPEC CHECKSUMS:
-  BarcodeScanner: 91ac9634d249b4e59a5b57dff9264b691bc99ea6
+  BarcodeScanner: e4b51b1c1c398bbf649e02da0d62c8c7a7de4c4f
 
 PODFILE CHECKSUM: ea40d735f047f0ae7ae319d7a320a82facf3361f
 
-COCOAPODS: 1.3.1
+COCOAPODS: 1.4.0

Sources/Controllers/BarcodeScannerViewController.swift

@@ -60,6 +60,8 @@ open class BarcodeScannerViewController: UIViewController {
   private var locked = false
   /// Flag to check if layout constraints has been activated.
   private var constraintsActivated = false
+  /// Flag to check if view controller is currently on screen
+  private var isVisible = false
 
   // MARK: - UI
 
@@ -106,6 +108,12 @@ open class BarcodeScannerViewController: UIViewController {
   open override func viewWillAppear(_ animated: Bool) {
     super.viewWillAppear(animated)
     setupCameraConstraints()
+    isVisible = true
+  }
+
+  open override func viewWillDisappear(_ animated: Bool) {
+    super.viewWillDisappear(animated)
+    isVisible = false
   }
 
   // MARK: - State handling
@@ -274,7 +282,6 @@ private extension BarcodeScannerViewController {
 
 extension BarcodeScannerViewController: HeaderViewControllerDelegate {
   func headerViewControllerDidTapCloseButton(_ controller: HeaderViewController) {
-    status = Status(state: .scanning)
     dismissalDelegate?.scannerDidDismiss(self)
   }
 }
@@ -304,7 +311,7 @@ extension BarcodeScannerViewController: CameraViewControllerDelegate {
 
   func cameraViewController(_ controller: CameraViewController,
                             didOutput metadataObjects: [AVMetadataObject]) {
-    guard !locked else { return }
+    guard !locked && isVisible else { return }
     guard !metadataObjects.isEmpty else { return }
 
     guard

Sources/Controllers/CameraViewController.swift

@@ -81,6 +81,7 @@ public final class CameraViewController: UIViewController {
   // MARK: - Initialization
 
   deinit {
+    stopCapturing()
     NotificationCenter.default.removeObserver(self)
   }
 
@@ -112,11 +113,6 @@ public final class CameraViewController: UIViewController {
     animateFocusView()
   }
 
-  public override func viewWillDisappear(_ animated: Bool) {
-    super.viewWillDisappear(animated)
-    captureSession.stopRunning()
-  }
-
   public override func viewWillTransition(to size: CGSize,
                                           with coordinator: UIViewControllerTransitionCoordinator) {
     super.viewWillTransition(to: size, with: coordinator)