title: How to toggle replace MKMapView's user location blue dot to an image?
body: <p>How to change <code>MKMapView</code> user location blue dot to an image and then image to blue dot?</p>
  
  <p><strong>Example-</strong> Suppose map has loaded with blue dot and I have a <code>UISwitch</code> (disabled) on that page initially. When user will enable switch I want to change blue dot to image and again if user will disable <code>UISwitch</code> then I want to change image to blue dot without loading map again.</p>