Slides of a presentation I did at 360iDev in Denver in September 2009. Sample code is available at E-String.com Let me know if you have any questions.

1. Getting Oriented with
MapKit
Julio Barros
Julio@E-String.com

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

3. Dark ages (pre 3.0)
• Static map images
• Web view with Javascript shenanigans
• Exit out to google maps
Julio Barros E-String.com

4. MapKit
• New in iPhone 3.x
• Embed map in your app
• Uses Google map tiles
• Familiar map UI
Julio Barros E-String.com

5. Important Classes
MKMapView
MKAnnotation (protocol)
MKAnnotationView
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6. Important Classes
MKMapView
MKMapViewDelegate
MKAnnotation (protocol)
MKAnnotationView
MKPinAnnotationView
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7. Simplest Example
• MKMapView ... just a view
• Or use Interface Builder
• Don’t forget to add mapkit framework
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8. That was
easy
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9. Show User
Location
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10. Showing a
particular area on
the map
Latitude Span
Center
“best fit” not exactly
what you set
Longitude Span
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11. Regions
• MKCoordinateRegion
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12. Denver,
Colorado
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13. Demo data
plist of Brewery information: name, address,
latitude, longitude
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14. Loading Demo Data
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15. Local area
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16. MKAnnotation
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17. MyAnnotation Class
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18. Adding Annotations
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19. Default Pins at
annotations
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20. Customizing pins
• MKPinAnnotationView
• MKMapViewDelegate - set a delegate
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21. Our purple
pins
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22. Custom markers
• MKAnnotationView
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23. Customizing
the view
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24. Customizing the
Callout
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25. Tapping the call out
view
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26. Reverse Geocoding
• Geocoding : address to coordinates
• geocoder.us other services
• Reverse geocoding : coordinates to address
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27. MKReverseGeocoder
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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
Julio Barros E-String.com

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

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
Julio Barros E-String.com

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 Julio Barros E-String.com

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

33. Resources
• MapKit Framework Reference - Apple
• Using Map Kit with Bill Dudney - PragProg
• Using Map Kit ... Bill Dudney - Wednesday
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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
Julio Barros E-String.com