Fix memory leak on capture image

Author: leoneparise

LLSimpleCamera/LLSimpleCamera.m

@@ -319,6 +319,7 @@ -(void)capture:(void (^)(LLSimpleCamera *camera, UIImage *image, NSDictionary *m
     // freeze the screen
     [self.captureVideoPreviewLayer.connection setEnabled:NO];
 
+    __weak typeof(self) _self = self;
     [self.stillImageOutput captureStillImageAsynchronouslyFromConnection:videoConnection completionHandler: ^(CMSampleBufferRef imageSampleBuffer, NSError *error) {
 
          UIImage *image = nil;
@@ -335,18 +336,18 @@ -(void)capture:(void (^)(LLSimpleCamera *camera, UIImage *image, NSDictionary *m
              image = [[UIImage alloc] initWithData:imageData];
 
              if(exactSeenImage) {
-                 image = [self cropImageUsingPreviewBounds:image];
+                 image = [_self cropImageUsingPreviewBounds:image];
              }
 
-             if(self.fixOrientationAfterCapture) {
+             if(_self.fixOrientationAfterCapture) {
                  image = [image fixOrientation];
              }
          }
 
          // trigger the block
          if(onCapture) {
              dispatch_async(dispatch_get_main_queue(), ^{
-                onCapture(self, image, metadata, error);
+                onCapture(_self, image, metadata, error);
              });
          }
      }];