How to extend MKPointAnnotation and add a property to it - iphone

Question

I'm trying to extend MKPointAnnotation and add a property to for an NSString called dealLink.
I thought I set it up correctly, but I'm getting this error at the moment:
Property 'dealLink' not found on object of type 'MKPointAnnotation *'
Here's my code in a view controller called MapOffersViewController.m:
#pragma mark - Populate Map
- (void)populateMap:(MKMapView*)map withDeals:(NSArray*) deals
{
NSLog(#"Deals " );
for (NSDictionary *currentDeal in deals) {
CLLocationCoordinate2D ctrpoint;
ctrpoint.latitude = [[[currentDeal objectForKey:#"coords"] objectForKey:#"lat"] doubleValue];
ctrpoint.longitude =[[[currentDeal objectForKey:#"coords"] objectForKey:#"lng"] doubleValue];
MKPointAnnotation *dealAnnotation = [[MKPointAnnotation alloc] init];
dealAnnotation.coordinate = ctrpoint;
dealAnnotation.title = [currentDeal objectForKey:#"vendor"];
**dealAnnotation.dealLink = [currentDeal objectForKey:#"link"];**
NSDictionary *currDict = #{
#"EUR": #"€",
#"GBP": #"₤",
#"USD": #"$",
#"BRL": #"R$"
};
NSString *currName = [currentDeal objectForKey:#"currency"];
NSString *currency = [currDict objectForKey:currName];
dealAnnotation.subtitle = [NSString stringWithFormat:#"%#%i",currency,[[currentDeal objectForKey:#"price"] integerValue ]];
NSLog(#"current deal id is %#",[currentDeal objectForKey:#"id"]);
[map setDelegate:self];
[map addAnnotation:dealAnnotation];
}
}
I'm importing this class called MapAnnotation.h:
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#interface MapAnnotation : MKPointAnnotation
{
NSString *title;
NSString *subtitle;
NSString *dealLink;
CLLocationCoordinate2D coordinate;
}
#property (nonatomic, copy) NSString *title;
#property (nonatomic, copy) NSString *subtitle;
#property (nonatomic, retain) NSString *dealLink;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
- (id)initWithTitle:(NSString *)ttl subTitle:(NSString *)subttl dealLink:(NSString *)dealLnk andCoordinate:(CLLocationCoordinate2D)c2d;
#end
and it's .m:
#import "MapAnnotation.h"
#implementation MapAnnotation
#synthesize title,subtitle,dealLink,coordinate;
- (id)initWithTitle:(NSString *)ttl subTitle:(NSString *)subttl dealLink:(NSString *)dealLnk andCoordinate:(CLLocationCoordinate2D)c2d {
title = ttl;
subtitle = subttl;
dealLink = dealLnk;
coordinate = c2d;
return self;
}
#end
thanks for any help
I used Craig's answer below and this additional code to get this working:
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
NSLog(#"callout tapped from del method %#", dealUrl);
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:dealUrl]];
}
- (void)mapView:(MKMapView *)mapView1 didSelectAnnotationView:(MKAnnotationView *)mapView2
{
MapAnnotation *annotation = mapView2.annotation;
NSString *temp = annotation.dealLink;
dealUrl = temp;
// NSLog(#"temp is %#", temp);
}

Answer 1

You're creating an MKPointAnnotation and trying to access dealLink, which is only on MapAnnotations. You need to create a MapAnnotation
....
ctrpoint.longitude =[[[currentDeal objectForKey:#"coords"] objectForKey:#"lng"] doubleValue];
MapAnnotation *dealAnnotation = [[MapAnnotation alloc] init];
dealAnnotation.coordinate = ctrpoint;
....