Lazy loading in map view?

I have to show开发者_运维问答 large set of location records in tableview and mapview depends on user switching between views. How lazy loading can be implemented?. I don't want query central server for location for even small change in location.

What kind of data are you lazily loading? If you're talking about annotations for your locations then MKMapView already handles lazy loading for you based on the region of the map. You just give it an array of your annotations and it will handle the lazy loading of the actual annotation views. If you mean something else, then please specify.