title: iOS Storyboard AutoLayout how to place UIView at the bottom in the both of 3.5" and 4" screens?
body: <p>I want to place black UIView at the bottom in the both of 3.5" and 4" screens using AutoLayout.<br>
  I added bottom constraints on the black UIView, but the view was always hidden in 3.5" screen.<br>
  I will never use AutoLayout in next project, but in current project, how can I fix it?<br></p>
  
  <p><img src="https://i.stack.imgur.com/layX3.png" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/c8fma.png" alt="enter image description here"></p>
  
  <p>Following is parent view's constraints.</p>
  
  <p><img src="https://i.stack.imgur.com/GNVt1.png" alt="enter image description here"></p>