title: How to change the centre point of MKAnnotation
body: <p>I am using MKMapkit for map-section in my app.
  I have to display a pin image <img src="https://i.stack.imgur.com/cd4yo.png" alt="enter image description here"> as MKAnnotation. When I add the annotation in map view, the center of the image, points to the latitude and longitude. But I want that the bottom-left corner of the image should point to the specified latitude and longitude.
  I am following the link <a href="http://developer.apple.com/library/ios/#samplecode/MapCallouts/Introduction/Intro.html" rel="nofollow noreferrer">MapCallouts</a> for displaying the annotation.
  Is there any way to achieve the target.
  Then please help. </p>