An Intro to MapKit
Rob Caporetto
@rob_caporetto

The Plan

The Plan
What is MapKit?

The Plan
What is MapKit?
Adding MapKit to your iPhone Application

The Plan
What is MapKit?
Adding MapKit to your iPhone Application
Setting the Position

The Plan
What is MapKit?
Adding MapKit to your iPhone Application
Setting the Position
Annotations

The Plan
What is MapKit?
Adding MapKit to your iPhone Application
Setting the Position
Annotations
Geocoding

The Plan
What is MapKit?
Adding MapKit to your iPhone Application
Setting the Position
Annotations
Geocoding
Interacting with Core Location

What is MapKit?

Embed Maps in your App

Adding MapKit to your App

Adding MapKit to your App
Add the Mapkit & CoreLocation frameworks
Create a View Controller which implements
MKMapViewDelegate
Create an MKMapView instance and connect to the
controller

Setting the Position
Set the region property
Defines the center point and a span
Span defines the vertical & horizontal distance to
display

Setting the Position
- (void)viewDidLoad
{
MKCoordinateRegion region;
region.center.latitude = [eventVenue.latitude doubleValue];
region.center.longitude = [eventVenue.longitude doubleValue];
region.span.latitudeDelta = 0.0039;
region.span.longitudeDelta = 0.0034;
mapView.region = region;
}

Annotations

Annotations
Allow you to add places-of-interest to a Map
Implemented with a Model & a View

Annotation Models
Implement the MKAnnotation protocol
Exposes a Title, Subtitle, and Coordinate

Title

Title Subtitle

Title Subtitle
Coordinate

Annotation Views
Use MKAnnotationView
Easiest trick to set the image property
Use MKPinAnnotationView if you want the Pin

Managing Annotation Views
Managed like UITableViewCells

Managing Annotation Views
- (MKAnnotationView *)mapView:(MKMapView *)theMapView
viewForAnnotation:(id <MKAnnotation>)annotation
{
MKPinAnnotationView *annotationView =
(MKPinAnnotationView *)([theMapView
dequeueReusableAnnotationViewWithIdentifier:@"annotation"]);
if (annotationView == NULL)
{
annotationView = [[[MKPinAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:@"annotation"] autorelease];
annotationView.canShowCallout = YES;
annotationView.animatesDrop = YES;
}
annotationView.annotation = annotation;
return annotationView;
}

Geocoding

Geocoding
Convert Landmarks into Longitude/Latitude
and vice-versa
SDK 3.0 Supports Reverse Geocoding only

Reverse Geocoding
Use MKReverseGeocoder
Requires network access (Wifi/3G/EDGE)
Asynchronous lookups

Interacting with Core
Location

Showing the User’s Location
Set the showsUserLocation property on the
MapView instance
Implement an Annotation

Showing the User’s Location
- (void)viewDidLoad
{
// Other initialisation…
mapView.showsUserLocation = YES;
}

Showing the User’s Location
- (MKAnnotationView *)mapView:(MKMapView *)theMapView
viewForAnnotation:(id <MKAnnotation>)annotation
{
// Checks to see if we are going to add the annotation for the users's location.
// If this is the case, then we don't bother with creating an annotation and let
// the platform give us the blue dot.
if (annotation == mapView.userLocation) return nil;
// Configuring other annotations…
}

Resources
WWDC 2009: Sessions 118 & 119
LocateMe Sample Application
PragProg MapKit Screencast:
http://pragprog.com/screencasts/v-bdmapkit