MKMapview placez une épingle à l'endroit (long/lat)

Vous devez:

1. ajouter le MapKit cadre de votre projet.
2. créer une classe qui implémente l'MKAnnotation protocole.

Exemple:

Annotation.h

@interface Annotation : NSObject <MKAnnotation> {
    NSString *_title;
    NSString *_subtitle;

    CLLocationCoordinate2D _coordinate;
}

//Getters and setters
- (void)setTitle:(NSString *)title;
- (void)setSubtitle:(NSString *)subtitle;

@end

Annotation.m

@implementation Annotation

#pragma mark -
#pragma mark Memory management

- (void)dealloc {
    [self setTitle:nil];
    [self setSubtitle:nil];

    [super dealloc];
}

#pragma mark -
#pragma mark Getters and setters

- (NSString *)title {
    return _title;
}

- (NSString *)subtitle {
    return _subtitle;
}

- (void)setTitle:(NSString *)title {    
    if (_title != title) {
        [_title release];
        _title = [title retain];
    }
}

- (void)setSubtitle:(NSString *)subtitle {
    if (_subtitle != subtitle) {
        [_subtitle release];
        _subtitle = [subtitle retain];
    }
}

- (CLLocationCoordinate2D)coordinate {
    return _coordinate;
}

- (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate {
    _coordinate = newCoordinate;
}

@end

2. créer une instance de cette classe et de définir les coordonnées lat/lon propriété

3. ajouter l'instance de la MKMapView objet avec cette méthode:

- (void)addAnnotation:(id<MKAnnotation>)annotation

4. Vous devez définir le délégué de la carte et de mettre en œuvre la méthode suivante:

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    if ([annotation isKindOfClass:[MKUserLocation class]]) {
        return nil;
    }

    static NSString* ShopAnnotationIdentifier = @"shopAnnotationIdentifier";
    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:ShopAnnotationIdentifier];
    if (!pinView) {
        pinView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:ShopAnnotationIdentifier] autorelease];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.animatesDrop = YES;
    }
    return pinView;
}

-(MKPointAnnotation *)showClusterPoint:(CLLocationCoordinate2D)coords withPos:(NSString *)place
{
    float  zoomLevel = 0.5;
    region = MKCoordinateRegionMake (coords, MKCoordinateSpanMake (zoomLevel, zoomLevel));
    [mapView setRegion: [mapView regionThatFits: region] animated: YES];

    point = [[MKPointAnnotation alloc]init];
    point.coordinate = coords;
    point.title=place;

    [mapView addAnnotation:point];

    return point;
}

Please use this code. its working fine.
-(void)addAllPinsOnMapView
{
MKCoordinateRegion region = mapViewOffer.region;
region.center = CLLocationCoordinate2DMake(23.0225, 72.5714);
region.span.longitudeDelta= 0.1f;
region.span.latitudeDelta= 0.1f;
[mapViewOffer setRegion:region animated:YES];
mapViewOffer.delegate=self;
MKPointAnnotation *mapPin = [[MKPointAnnotation alloc] init];
CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(23.0225, 72.5714);
mapPin.title = @"Title";
mapPin.coordinate = coordinate;
[mapViewOffer addAnnotation:mapPin];
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:
(MKAnnotationView *)view
{
NSLog(@"%@",view.annotation.title);
NSLog(@"%f",view.annotation.coordinate.latitude);
NSLog(@"%f",view.annotation.coordinate.longitude);
}
- (MKAnnotationView *)mapView:(MKMapView *)theMapView 
viewForAnnotation:(id <MKAnnotation>)annotation
{
if ([annotation isKindOfClass:[MKUserLocation class]])
{
((MKUserLocation *)annotation).title = @"Current Location";
return nil;
}
else
{
MKAnnotationView *pinView = nil;
static NSString *defaultPinID = @"annotationViewID";
pinView = (MKAnnotationView *)[mapViewOffer dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
if ( pinView == nil ){
pinView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID];
}
pinView.canShowCallout = YES;
pinView.image = [UIImage imageNamed:@"placeholder"];
UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
//   [infoButton addTarget:self action:@selector(infoButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
pinView.rightCalloutAccessoryView = infoButton;
pinView.rightCalloutAccessoryView.tag=1;
return pinView;
}
}
- (MKPinAnnotationView*)myMap:(MKMapView*)myMap viewForAnnotation:
(id<MKAnnotation>)annotation{
MKPinAnnotationView *pin = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"CustomPin"];
UIImage *icon = [UIImage imageNamed:@"bustour.png"];
UIImageView *iconView = [[UIImageView alloc] initWithFrame:CGRectMake(8,0,32,37)];
if(icon == nil)
NSLog(@"image: ");
else
NSLog(@"image: %@", (NSString*)icon.description);
[iconView setImage:icon];
[pin addSubview:iconView];
pin.canShowCallout = YES;
pin.pinColor = MKPinAnnotationColorPurple;
return pin;
}
- (IBAction)btnLocateMe:(UIButton *)sender
{
[mapViewOffer setCenterCoordinate:mapViewOffer.userLocation.location.coordinate animated:YES];
}