The document discusses the integration of MapKit into iPhone applications, highlighting its functionalities such as embedding maps, displaying user locations, and customizing annotations. It outlines important classes like MKMapView and MKAnnotation, as well as techniques for geocoding and reverse geocoding. Additionally, it mentions challenges related to map scaling and legal considerations when using mapping services.

1. MapKit
Julio Barros
Julio@E-String.com

2. Why Maps?
• iPhone is a mobile / pocket computer
• Where am I?
• What’s near me?
• How do I get somewhere?

3. Dark ages (pre 3.0)
• Static map images
• Web view with Javascript shenanigans
• Exit out to google maps

4. MapKit
• New in iPhone 3.x
• Embed map in your app
• Uses Google map tiles
• Familiar map UI

5. Important Classes
MKMapView
MKAnnotation (protocol)
MKAnnotationView

6. Important Classes
MKMapView
MKMapViewDelegate
MKAnnotation (protocol)
MKAnnotationView
MKPinAnnotationView

7. Simplest Example
• MKMapView ... just a view
• Don’t forget to add mapkit framework
• Or use Interface Builder

8. That was
easy

9. Show User
Location

10. Showing a
particular area on
the map
Latitude Span
Center
“best fit” not exactly
what you set
Longitude Span

11. Regions
• MKCoordinateRegion

12. Denver,
Colorado

13. Demo data
plist of Brewery information: name, address,
latitude, longitude

14. Loading Demo Data

15. Local area

16. MKAnnotation

17. MyAnnotation Class

18. Adding Annotations

19. Default Pins at
annotations

20. Customizing pins
• MKPinAnnotationView
• MKMapViewDelegate - set a delegate

21. Our purple
pins

22. Custom markers
• MKAnnotationView

23. Customizing
the view

24. Customizing the
Callout

25. Tapping the call out
view

26. Reverse Geocoding
• Geocoding : address to coordinates
• geocoder.us other services
• Reverse geocoding : coordinates to address

27. MKReverseGeocoder

28. MKPlacemark
• Address info including, country code,
country, postal code, administrative area,
sub administrative area, locality, sub locality,
thoroughfare, sub thoroughfare
• Conforms to MKAnnotation
• Has address dictionary with Address Book
keys

29. Number of pins
• Try to limit
annotations to ~100(?)
• Implement region
change delegate
methods
• Create and manage
your own clusters

30. Challenges
• Anchoring an object to a location on the
map and having it scale.
• Shapes - neighborhoods
• Lines - routes / paths
• View space to Geo Space
- (CGPoint)convertCoordinate:(CLLocationCoordinate2D)
coordinate toPointToView:(UIView *)view
- (CLLocationCoordinate2D)convertPoint:(CGPoint)point
toCoordinateFromView:(UIView *)view

31. Legal limitations
I’m not a lawyer but think carefully before
using this for:
vehicle/fleet tracking
routing
cacheing tiles
geocoding / mass reverse geocoding
Read the TOS
http://code.google.com/apis/maps/iphone/
terms.html

32. Possible Options
• OpenStreetMap.org (OSM) - map/tile data
• Route-Me - OSS map view
• Cloudemade.com - services around OSM
• geocoder.us (among others)

33. Resources
• MapKit Framework Reference - Apple
• Using Map Kit with Bill Dudney - PragProg
• Using Map Kit ... Bill Dudney - Wednesday

34. Thank You
Julio Barros
Julio@E-String.com
http://www.E-String.com
http://twitter.com/JulioBarros
Also on Face book and Linked In