title: Layout background image in Xamarin.Forms
body: <p>I need block with fixed height (e.g. 200) with background image, which should <code>AspectFill</code> this block and <code>StackLayout</code> with unknown height at the bottom of this block. </p>
  
  <p>I tried to use <code>RelativeLayout</code> and put <code>Image</code> and <code>StackLayout</code> in it. Image placed perfectly, but I don't know how to place <code>StackLayout</code> at the bottom. </p>
  
  <p>This layout containes two <code>Labels</code>, so I can't hard-code it's <code>HeightConstrait</code> and <code>YConstrait</code> to constant, becouse it text may have different height on different platforms and screen sizes (or, maybe, this is wrong?)</p>
  
  <p>How can I do this?</p>
  
  <p><a href="https://i.stack.imgur.com/DMgkl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DMgkl.png" alt="enter image description here"></a></p>