Re-using this code for multiple mapkit pin annotations - ios

Question

I have this code below working perfectly for a unique Pin and one annotation. I want to adapt it without too many changes to display more Pins, locations and annotations.
There is a class called MyAnnotationPins with the following lines:
MyAnnotationPins.h
#interface MyAnnotationPins : NSObject < MKAnnotation>
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
#property (nonatomic, readonly, copy) NSString *title;
#property (nonatomic, readonly, copy) NSString *subtitle;
-(id)initWithCoordinate:(CLLocationCoordinate2D)annotCoordinate title:(NSString*)annotTitle subtitle:(NSString*)annotSubtitle;
MyAnnotationPins.m
#synthesize coordinate;
#synthesize subtitle;
#synthesize title;
-(id)initWithCoordinate:(CLLocationCoordinate2D)annotCoordinate title:(NSString*)annotTitle subtitle:(NSString*)annotSubtitle
{
self = [super init];
if (self)
{
coordinate = annotCoordinate;
subtitle = [[NSString alloc] initWithString:annotSubtitle];
title = [[NSString alloc] initWithString:annotTitle];
}
return self;
}
And at the view controller the following code:
SecondViewController.h
import "MyAnnotationPins.h"
#interface SecondViewController : UIViewController < MKMapViewDelegate >
#property (weak, nonatomic) IBOutlet MKMapView *mapView;
#property (strong, nonatomic) MyAnnotationPins* biblioAnnotation;
At the SecondViewController.m the implementation:
- (void)viewDidLoad
{
[super viewDidLoad];
mapView.delegate = self;
MKCoordinateRegion mapRegion;
mapRegion.center.latitude=-18.924129;
mapRegion.center.longitude=-48.283963;
mapRegion.span.latitudeDelta=0.2;
mapRegion.span.longitudeDelta=0.2;
[mapView setRegion:mapRegion animated:YES];
///// This is just for One annotaion/Pin on Map /////
CLLocationCoordinate2D parliamentLocation = CLLocationCoordinate2DMake(-18.924129, -48.283963);
biblioAnnotation = [[MyAnnotationPins alloc]
initWithCoordinate:parliamentLocation
title:#"Ponto Biblioteca"
subtitle:#"Taxi proximo"];
[mapView addAnnotation:biblioAnnotation];
If you want more than one pin and annotaion copy the CLLocation instance below and change the following atributes
CLLocationCoordinate2D secondLocation = CLLocationCoordinate2DMake(another latitude, another longitude);
secondAnnotation = [[MyAnnotationPins alloc]
initWithCoordinate:secondLocation
title:#"Second Title"
subtitle:#"Second subtitle"];
[mapView addAnnotation:secondAnnotation]; <code>
And so on for the third, fourth fifth etc. Do not forget to create the secondLocation proerty at your view controller like the first one in SecondViewController.h and also
#synthesize secondAnnotation property at SecondViewController.m file
#property (strong, nonatomic) MyAnnotationPins* secondAnnotation;

Answer 1

Add them in a loop like so
for(X in Y)
{
CLLocationCoordinate2D parliamentLocation = CLLocationCoordinate2DMake(-18.924129, -48.283963);
MyAnnotationPins* biblioAnnotation = [[MyAnnotationPins alloc]
initWithCoordinate:parliamentLocation
title:#"Ponto Biblioteca"
subtitle:#"Taxi proximo"];
[mapView addAnnotation:biblioAnnotation];
}
As you loop through your list you can get the right coordinates and title for each one. This way you list can grow or shrink and you won't need to add third, fourth or fifth annotation properties.