title: How to drop a pin on an image instead of a map
body: <p>For my current project, I need to drop some pins on a image(NOT a map), and also should be able to click the pin to add some comments to this pin. I wonder if I can use MKAnnotation/MKAnnotationView to do this. I have searched on Internet for a while. I only find tutorials about how to customize MKAnnotation with other images. </p>
  
  <p>If I cannot use MKAnnotation, what should I use? Any tutorials about this will be great helpful.</p>
  
  <p>Thanks.</p>