title: Drawing circle without fill IOS
body: <p>I am using this code to draw a circle inside a UIImageView.</p>
  
  <pre><code>CAShapeLayer *circleLayer = [CAShapeLayer layer];
  // Give the layer the same bounds as your image view
  [circleLayer setBounds:CGRectMake(0.0f, 0.0f, [photoView bounds].size.width,
                                    [photoView bounds].size.height)];
  // Position the circle anywhere you like, but this will center it
  // In the parent layer, which will be your image view's root layer
  [circleLayer setPosition:CGPointMake(coordsFinal.x + 130, coordsFinal.y + 200)];
  // Create a circle path.
  UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:
                        CGRectMake(0.0f, 0.0f, 50.0f, 50.0f)];
  // Set the path on the layer
  [circleLayer setPath:[path CGPath]];
  // Set the stroke color
  [circleLayer setStrokeColor:[color CGColor]];
  // Set the stroke line width
  [circleLayer setLineWidth:2.0f];
  
  // Add the sublayer to the image view's layer tree
  [[photoView layer] addSublayer:circleLayer];
  </code></pre>
  
  <p>I would like the circle to be empty, and to have only the border. How can I remove the fill?</p>