Adding more annotations to UIMapView - objective-c

Question

I want to add more annotations to my mapview. I'm working with a class Annotation where there is a method addAnnotation. This method is being called in my UIViewController when I want to add a new annotation.
But for some reason, only the annotation I added last, is displayed.
Annotation.h
#import <Foundation/Foundation.h>
#import <MapKit/MKAnnotation.h>
#interface Annotation : NSObject {
CLLocationCoordinate2D cooridnate;
NSString *title;
NSString *subtitle;
}
#property (nonatomic, assign) CLLocationCoordinate2D coordinate;
#property (nonatomic, copy) NSString *title;
#property (nonatomic, copy) NSString *subtitle;
#property (nonatomic, retain) NSMutableArray *locations;
-(void)addAnnotation: (NSString *)initTitle : (NSString *)initSubtitle : (CLLocationCoordinate2D) initCoordinate;
#end
Annotation.m
#import "Annotation.h"
#implementation Annotation
#synthesize coordinate, title, subtitle, locations;
-(void)addAnnotation: (NSString *)initTitle : (NSString *)initSubtitle : (CLLocationCoordinate2D) initCoordinate {
locations = [[NSMutableArray alloc] init];
self.coordinate = initCoordinate;
self.title = [NSString stringWithFormat:#"%#", initTitle];
self.subtitle = [NSString stringWithFormat:#"%#", initSubtitle];
[locations addObject:self]; // add all my anotations with location to an array
}
#end
Method in my UIViewController
#import "MapViewController.h"
#interface MapViewController ()
#end
#implementation MapViewController
#synthesize mapView;
#pragma mark - ViewController methods
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
[self initMapView];
ann = [[Annotation alloc] init]; // making place in memory
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - UIMapController methods
- (void)mapViewDidFinishLoadingMap:(MKMapView *)mapView {
[self createAnnotations];
}
-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
if ([annotation isKindOfClass:[MKUserLocation class]]) {
//If annotation = user position ==> DON'T CHANGE
return nil;
}
MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"current"];
MyPin.pinColor = MKPinAnnotationColorRed;
UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[advertButton addTarget:self action:#selector(showInfo:) forControlEvents:UIControlEventTouchUpInside];
MyPin.rightCalloutAccessoryView = advertButton;
MyPin.draggable = NO;
MyPin.highlighted = NO;
MyPin.animatesDrop= FALSE;
MyPin.canShowCallout = YES;
return MyPin;
}
#pragma mark - MY Methods
-(void) initMapView {
[mapView setMapType:MKMapTypeStandard]; // standaard maptype
[mapView setScrollEnabled:YES];
[mapView setZoomEnabled:YES];
[mapView setDelegate:self]; // gegevens van de map terugsturen naar deze viewController en de gebruiker
[mapView setShowsUserLocation:YES];
[self focusWorld];
}
-(void) createAnnotations {
[self initSomeExamples];
[self.mapView addAnnotations: ann.locations];
}
-(void) focusWorld {
MKCoordinateRegion worldRegion = MKCoordinateRegionForMapRect(MKMapRectWorld); // regio instellen op World
mapView.region = worldRegion; // regio doorgeven naar onze mapView
}
-(void) initSomeExamples {
// Washington
l1.latitude = 38.892102;
l1.longitude = -77.029953;
// Antwerp
l2.latitude = 51.219787;
l2.longitude = 4.411011;
// Egypt
l3.latitude = 29.993002;
l3.longitude = 31.157227;
// Brazil
l4.latitude = -22.900846;
l4.longitude = -43.212662;
[ann addAnnotation:#"America has a new President !" :#"Washington DC" :l1]; // call method to add an annotation with these parameters
[ann addAnnotation:#"Revolutionary app by Belgium student" :#"Antwerp" :l2];
[ann addAnnotation:#"The new Arabic revolution" :#"Egypt, Tahir square" :l3];
[ann addAnnotation:#"World Championchip football" :#"Rio de Janeiro" :l4];
}
#pragma mark - ACTIONS
-(void)showInfo:(id)sender {
NSLog(#"Show info");
}
#end

Answer 1

You don't need locations #property and - addAnnotation: method. One MKAnnotation object represents a location.
My suggestion is to modify Annotation class accordingly, as well as conforming and create it's objects as many as number of locations you would like to annotate.
Remove locations #property and -addAnnotation: method from Annotation.h/m
Annotation.h
#import <Foundation/Foundation.h>
#import <MapKit/MKAnnotation.h>
#interface Annotation : NSObject <MKAnnotation> {
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
}
#property (nonatomic, assign) CLLocationCoordinate2D coordinate;
#property (nonatomic, copy) NSString *title;
#property (nonatomic, copy) NSString *subtitle;
-(id) initWithTitle: (NSString *)initTitle : (NSString *)initSubtitle : (CLLocationCoordinate2D) initCoordinate;
#end
Annotation.m
#import "Annotation.h"
#implementation Annotation
#synthesize coordinate, title, subtitle;
-(id) initWithTitle: (NSString *)initTitle : (NSString *)initSubtitle : (CLLocationCoordinate2D) initCoordinate {
self = [super init];
if ( self ) {
self.coordinate = initCoordinate;
self.title = [NSString stringWithFormat:#"%#", initTitle];
self.subtitle = [NSString stringWithFormat:#"%#", initSubtitle];
}
return self; // correction appreciated.
}
#end
Some methods changed in your view controller
-(void) initSomeExamples {
// Washington
l1.latitude = 38.892102;
l1.longitude = -77.029953;
// Antwerp
l2.latitude = 51.219787;
l2.longitude = 4.411011;
// Egypt
l3.latitude = 29.993002;
l3.longitude = 31.157227;
// Brazil
l4.latitude = -22.900846;
l4.longitude = -43.212662;
NSArray *annotations = #[
[[Annotation alloc] initWithTitle:#"America has a new President !" :#"Washington DC" :l1],
[[Annotation alloc] initWithTitle:#"Revolutionary app by Belgium student" :#"Antwerp" :l2],
[[Annotation alloc] initWithTitle:#"The new Arabic revolution" :#"Egypt, Tahir square" :l3],
[[Annotation alloc] initWithTitle:#"World Championchip football" :#"Rio de Janeiro" :l4] ];
// Adding 4 annotation objects
[self.mapView addAnnotations:annotations];
}
-(void) createAnnotations {
[self initSomeExamples];
// Annotations are added in -initSomeExamples method.
}