Merge pull request #7571 from panxiaochun:CvVideoCamera_stop

modules/videoio/src/cap_ios_abstract_camera.mm

@@ -203,11 +203,11 @@
         }
 
         [self.captureSession stopRunning];
-        self.captureSession = nil;
+        [captureSession release];
     }
 
-    self.captureVideoPreviewLayer = nil;
+    [captureVideoPreviewLayer release];
-    self.videoCaptureConnection = nil;
+    [videoCaptureConnection release];
     captureSessionLoaded = NO;
 }
 

modules/videoio/src/cap_ios_video_camera.mm

@@ -129,9 +129,10 @@ static CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;}
 
 - (void)stop;
 {
+    if (self.running == YES) {
         [super stop];
 
-    self.videoDataOutput = nil;
+        [videoDataOutput release];
         if (videoDataOutputQueue) {
             dispatch_release(videoDataOutputQueue);
         }
@@ -144,11 +145,11 @@ static CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;}
                 } else {
                     NSLog(@"[Camera] Recording Error: asset writer status is not writing");
                 }
-            self.recordAssetWriter = nil;
+                [recordAssetWriter release];
             }
 
-        self.recordAssetWriterInput = nil;
+            [recordAssetWriterInput release];
-        self.recordPixelBufferAdaptor = nil;
+            [recordPixelBufferAdaptor release];
         }
 
         if (self.customPreviewLayer) {
@@ -156,6 +157,7 @@ static CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;}
             self.customPreviewLayer = nil;
         }
     }
+}
 
 // TODO fix
 - (void)adjustLayoutToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation;