title: UIView appereance from bottom to top and vice versa(Core Animation)
body: <p>My goal is to understand and implement feature via Core Animation.<br>
  I think it's not so hard,but unfortunately i don't know swift/Obj C and it's hard to understand native examples.  </p>
  
  <hr>
  
  <h2>Visual implementation</h2>
  
  <p>So what exactly i want to do(few steps as shown on images):<br>
  1. <a href="https://i.stack.imgur.com/a39bD.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/a39bD.jpg" alt="Source"></a><br>
  2. <a href="https://i.stack.imgur.com/ZrzTk.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ZrzTk.jpg" alt="enter image description here"></a><br>
  3. <a href="https://i.stack.imgur.com/2w2xs.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/2w2xs.jpg" alt="enter image description here"></a><br>
  4. <a href="https://i.stack.imgur.com/QkJF2.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/QkJF2.jpg" alt="enter image description here"></a>  </p>
  
  <p>And the same steps to hide view(vice versa,from top to bottom) until this :  </p>
  
  <p><a href="https://i.stack.imgur.com/ZrzTk.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ZrzTk.jpg" alt="enter image description here"></a>   </p>
  
  <p>Also,i want to make this <strong>UIView</strong> more generic,i mean to put this <strong>UIView</strong> on my StoryBoard and put so constraints on AutoLayout(to support different device screens).  </p>
  
  <p>Any ideas? Thanks!</p>