title: Local declaration of 'imgView' hides instance variable (app crashes)
body: <p>If I debug my app. The app crashes in this line of code and I get this warning: </p>
  
  <p><strong>Warning:</strong></p>
  
  <pre><code>Local declaration of 'imgView' hides instance variable
  </code></pre>
  
  <p><strong>Line of code:</strong></p>
  
  <pre><code>[brightnessFilter forceProcessingAtSize:imgView.sizeInPixels]; 
  </code></pre>
  
  <p><strong>Block of code:</strong></p>
  
  <pre><code>- (IBAction)sliderBrightness:(id)sender {
  
      UIImage *inputImage = imgView.image;
  
      sourcePicture = [[GPUImagePicture alloc] initWithImage:inputImage smoothlyScaleOutput:YES];
      brightnessFilter = [[GPUImageBrightnessFilter alloc] init];
  
      GPUImageView *imgView = (GPUImageView *)self.view;
      [brightnessFilter forceProcessingAtSize:imgView.sizeInPixels]; 
  
      [sourcePicture addTarget:brightnessFilter];
      [brightnessFilter addTarget:imgView];
  
      [sourcePicture processImage];
  }
  </code></pre>
  
  <p>Can someone help me to solve the problem?</p>