title: ScrollView - How to let button always stay at the bottom of the screen
body: <p>I want the button to stay at the bottom of the screen, not of the Viewcontroller.</p>
  
  <p>So my question is: How should I set constraints or write code to make my button always stay at the bottom of my screen?</p>
  
  <p>I could like add a constraint to the top of the screen to make the button stay at the bottom, but that depends on the high of the device.</p>
  
  <p>The button that should always stay at the bottom of the device</p>
  
  <p><a href="https://i.stack.imgur.com/sdsuj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sdsuj.png" alt="enter image description here"></a></p>
  
  <p>If I change the high of the Viewcontroller, the button moves to the bottom of the <strong>Viewcontroller</strong>, because of the constraint. And the right constraint would be one that goes to the bottom of the <strong>screen</strong></p>
  
  <p><a href="https://i.stack.imgur.com/QlYMg.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/QlYMg.png" alt="enter image description here"></a></p>