title: UIPickerView row image selection highlight colour
body: <p>I currently have a UIPicker which I load in an image for each row using:</p>
  
  <pre><code>- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
  </code></pre>
  
  <p>Unlike the normal behaviour using text in the UIPicker row, when using images I get a background selection colour over the image (blue) and was wondering if there was a way to change this colour or even cancel it (probably setting the colour to clearColor). I've tried using highlightedImage on the imageView i'm returning but this didn't work.</p>
  
  <p>Thanks</p>