title: Pin Annotation as Subview on map
body: <p>Here's what i'm expect : 
  <a href="https://i.stack.imgur.com/36VDu.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/36VDu.jpg" alt="enter image description here"></a></p>
  
  <p>as I know, annotationView cannot contain view. Anyone help me. thanks alot.</p>