How to get effect like HazardMap on dropped annotations in mapView iPhone? - iphone

I want to Make heat map (HazardMap) based on annotations dropped to the mapView. If i have more annotation than the location should be red. How to do This. Please anyone help me? like This Map

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Pin images change after map type change?

I am just loading a simple map with customize pin images on pin annotations. First time it loads the pin images in map correctly. When i change map type the pins are change in their default format.Guys do you have any idea about this problem. Any help will be appreciated.Thanks in advance..
In viewForAnnotation, make sure you are creating a plain MKAnnotationView and not an MKPinAnnotationView.

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get google coordinates by touching the map. iPhone

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Kindly explain me with an example.
Thanks,
Best Regards,
Naveed Butt
You can create a draggable pin with the new sdk. Check this out Map kit annotation