前回の続き：

[iPhone] Map Kitで遊ぼう：地図を出して現在位置にピンを立てる
http://blog.s21g.com/articles/1596

参考：

Drawing polyines or routes on a MKMapView (as an MKAnnotationView) – Part 2
http://spitzkoff.com/craig/?p=108

MKAnnotationを実装するクラスを作成

MyAnnotation.h

   1  #import <Foundation/Foundation.h>
   2  #import <MapKit/MapKit.h>
   3  
   4  @interface MyAnnotation : NSObject <MKAnnotation> {
   5  	CLLocationCoordinate2D _coordinate;
   6  }
   7  
   8  @property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
   9  
  10  -(id)initWithCoordinate:(CLLocationCoordinate2D) coordinate;
  11  
  12  @end

MyAnnotation.m

   1  #import "MyAnnotation.h"
   2  
   3  @implementation MyAnnotation
   4  
   5  @synthesize coordinate=_coordinate;
   6  
   7  -(id)initWithCoordinate:(CLLocationCoordinate2D) c{
   8  	_coordinate=c;
   9  	return self;
  10  }
  11  
  12  @end

ViewControllerでMKMapViewDelegateを実装

ポイントとしては

• .hでMKMapViewDelegateを実装宣言
• _mapView.delegate = self;
• -(MKAnnotationView )mapView:(MKMapView )mapView viewForAnnotation:(id )annotationを実装
• MyAnnotationなら画像を設定する：
  if([annotation isKindOfClass:[MyAnnotation class]]) { annotationView.image = [UIImage imageNamed:@"some.png"];

本当はMKAnnotationViewを派生して、MyAnnotationViewを作るのがベターなんですけど省略しています。

MapTutorialViewController.h

   1  #import <UIKit/UIKit.h>
   2  #import <MapKit/MapKit.h>
   3  
   4  @interface MapTutorialViewController : UIViewController <MKMapViewDelegate> {
   5  	MKMapView *_mapView;
   6  }
   7  @end

MapTutorialViewController.m

   1  #pragma mark MKMapViewDelegate
   2  - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
   3  	MKAnnotationView *annotationView;
   4  	NSString* identifier = @"Pin";
   5  	annotationView = (MKPinAnnotationView*)[_mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
   6  	if(nil == annotationView) {
   7  		annotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier] autorelease];
   8  	}
   9  	if([annotation isKindOfClass:[MyAnnotation class]]) {
  10  		annotationView.image = [UIImage imageNamed:@"some.png"]; //地図に表示したい画像を設定
  11  	}
  12  	return annotationView;
  13  }
  14  
  15  - (void)addSomeAnnotations {
  16  	//a location
  17  	double latitude = 37.331688999999997;
  18  	double longitude = -122.030731;
  19  	CLLocationCoordinate2D _location;
  20  	_location.latitude = latitude;
  21  	_location.longitude = longitude;
  22  	
  23  	CLLocationCoordinate2D location1;
  24  	MyAnnotation *annotation;
  25  		
  26  	location1.latitude = _location.latitude+0.1;
  27  	location1.longitude  = _location.longitude+0.1;
  28  	annotation =[[MyAnnotation alloc] initWithCoordinate:location1];
  29  	[_mapView addAnnotation:annotation];
  30  		
  31  	location1.latitude = _location.latitude+0.5;
  32  	location1.longitude  = _location.longitude+0.5;
  33  	annotation =[[MyAnnotation alloc] initWithCoordinate:location1];
  34  	[_mapView addAnnotation:annotation];
  35  }
  36  
  37  - (void)viewDidLoad {
  38      [super viewDidLoad];
  39  	
  40  	_mapView = [[MKMapView alloc] initWithFrame:self.view.bounds];
  41  	_mapView.showsUserLocation=TRUE;
  42  	_mapView.delegate = self;
  43  	[self.view addSubview:_mapView];
  44  		
  45  	[self addSomeAnnotations];
  46  
  47  }
  48