title: Set the font line height of a Xamarin.Forms Label
body: <p>I have a Xamarin.Forms label showing several lines of text and I would like to increase the line height to make the text more readable.</p>
  
  <p>The font properties available on the <code>Label</code> and <code>Span</code> controls seem limited to font face, size and style.</p>
  
  <p>How can I change the line height?</p>