title: Make a UIView draggable with the finger
body: <p>I have the <code>mainViewController</code> but I have an small <code>UIView</code> inside that is activated when you tap a <code>MKAnnotationView</code> in the <code>MKMapKit</code>, so I need that <code>UIView</code> to be draggable in any part of the screen.</p>
  
  <p>An example screenshot of my app:</p>
  
  <p><img src="https://i.stack.imgur.com/jOz9L.jpg" alt="enter image description here"></p>
  
  <p>The circle is an example of point, I suppose I can drag for any point of the "small" UIView.</p>
  
  <p>I tried using <code>UITapGestureRecognizer</code> but it didn't worked as my code was not good enough and I could not made it draggable because it's only the tap, not tap and move.</p>
  
  <p>I hope you can help me.</p>