title: How to set the style attribution to fill the rest space?
body: <p>As you see the image, if the three red views are already added on the parent view. Now I want to add another blue view which can fill the rest space. How can I set the style?</p>
  
  <p><img src="https://i.stack.imgur.com/CqRRr.png" alt="enter image description here"></p>