Merge pull request juliansteenbakker#1401 from navaronbracke/fix_ios_remove_observer_crash

Fix: remove observer when device is nil

Author: juliansteenbakker

CHANGELOG.md

@@ -1,3 +1,6 @@
+## 6.0.10
+* [Apple] Fixed a crash when stopping the camera when the camera device is nil.
+
 ## 6.0.9
 Fixed onDetect not working when a `MobileScannerController` is provided.
 

ios/Classes/MobileScanner.swift

@@ -324,10 +324,13 @@ public class MobileScanner: NSObject, AVCaptureVideoDataOutputSampleBufferDelega
     }
 
     private func releaseCamera() {
-
         guard let captureSession = captureSession else {
             return
         }
+        
+        guard let device = device else {
+            return
+        }
 
         captureSession.stopRunning()
         for input in captureSession.inputs {
@@ -341,7 +344,7 @@ public class MobileScanner: NSObject, AVCaptureVideoDataOutputSampleBufferDelega
         device.removeObserver(self, forKeyPath: #keyPath(AVCaptureDevice.torchMode))
         device.removeObserver(self, forKeyPath: #keyPath(AVCaptureDevice.videoZoomFactor))
         self.captureSession = nil
-        device = nil
+        self.device = nil
     }
 
     private func releaseTexture() {

macos/mobile_scanner/Sources/mobile_scanner/MobileScannerPlugin.swift

@@ -481,6 +481,10 @@ public class MobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHandler,
             return
         }
 
+        guard let device = device else {
+            return
+        }
+
         captureSession.stopRunning()
         for input in captureSession.inputs {
             captureSession.removeInput(input)
@@ -492,7 +496,7 @@ public class MobileScannerPlugin: NSObject, FlutterPlugin, FlutterStreamHandler,
 
         latestBuffer = nil
         self.captureSession = nil
-        device = nil
+        self.device = nil
     }
 
     private func releaseTexture() {

pubspec.yaml

@@ -1,6 +1,6 @@
 name: mobile_scanner
 description: A universal barcode and QR code scanner for Flutter based on MLKit. Uses CameraX on Android, AVFoundation on iOS and Apple Vision & AVFoundation on macOS.
-version: 6.0.9
+version: 6.0.10
 repository: https://github.com/juliansteenbakker/mobile_scanner
 
 screenshots: