iPhone MKMapView Annotation Clustering

by

You don’t necessarily need to use a 3rd party framework because since iOS 4.2, MKMapView has a method called - (NSSet *)annotationsInMapRect:(MKMapRect)mapRect which you can use to do your clustering.

Check out the WWDC11 Session video ‘Visualizing Information Geographically with MapKit‘. About half way through it explains how to do it. But I’ll summarize the concept for you:

  • Use Two maps (second map is never added to the view hierarchy)
  • Second map contains all annotations (again, it’s never drawn)
  • Divide map area into a grid of squares
  • Use -annotationsInMapRect method to get annotation data from
    invisible map
  • Visible map builds its annotations from this data from invisible map

enter image description here

More Related Contents:

  1. MKAnnotationView Push to View Controller when DetailDesclosure Button is Clicked
  2. Is there way to limit MKMapView maximum zoom level?
  3. MKAnnotationView – Lock custom annotation view to pin on location updates
  4. Multiple annotation callouts displaying in MKMapView
  5. How to search MKMapView with UISearchBar?
  6. Getting the bounds of an MKMapView
  7. Restrict MKMapView scrolling
  8. MKMapView annotations changing/losing order?
  9. How to display 2 lines of text for subtitle of MKAnnotation and change the image for the button on the right?
  10. Annotation details after detail disclosure pressed?
  11. How to add a push pin to a MKMapView(IOS) when touching?
  12. Custom MKPinAnnotation callout bubble similar to default callout bubble
  13. UIModalTransitionStylePartialCurl with UITabBarController
  14. Why am I crashing after MKMapView is freed if I’m no longer using it?
  15. Prevent scrolling in a MKMapView, also when zooming
  16. MKMapView setRegion “snaps” to predefined zoom levels?
  17. How to get click event from a button added over MKAnnotationView
  18. How do I create an image overlay and add to MKMapView?
  19. how to manage drag and drop for MKAnnotationView on IOS?
  20. How to make an iPhone app compatible with multiple SDK (firmware) versions
  21. Storyboard – refer to ViewController in AppDelegate
  22. How can I create a custom “pin-drop” animation using MKAnnotationView?
  23. Is ARC really supported in iOS 4? The iOS 4.2 SDK is missing ARC-related symbols at linking time
  24. iPhone – dequeueReusableCellWithIdentifier usage
  25. iOS HTTP request while in background
  26. How to get the size of a NSString
  27. Invalid iPhone Application Binary
  28. iPhone – UIImagePickerControllerDelegate inheritance
  29. URLWithString: returns nil
  30. Loading a webpage through UIWebView with POST parameters

Leave a Comment