custom data variables in mkannotation - ios

Question

I have a map view controller (UIViewController, MKMapView), with its delegate (HCIResultMapViewController).
I wish to have following functionality in this part.
1). I wish to use my custom made NSObject , so that I can associate others details along with the basic entities like title, subtitle etc.
Hence according to my needs I coded as following
In HCIResultMapViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
_houseList = [[_resultList objectForKey:#"result"] objectForKey:#"listings"];
// NSLog([_houseList description]);
int i = 0;
for (NSDictionary *house in _houseList) {
HCIAnnotationViewController *annotation = [[HCIAnnotationViewController alloc]
initwithHouse:house];
[_mapView addAnnotation:annotation];
// NSLog(#"asdjhasdjsajdhaksdjghasdasdjahsdahskvdka");
self.currIdentifier = i;
i++;
}
[_mapView setShowsUserLocation:NO];
}
The other delegate functions
-(void) mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control {
for (NSObject<MKAnnotation> *annotation in _mapView.selectedAnnotations) {
NSLog(#"hellomaster");
NSLog(annotation.title);
if ([annotation isKindOfClass:[HCIAnnotationViewController class]]) {
NSLog(#"hellomaster");
}
}
The last one
-(MKAnnotationView*) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
NSString *identifier = #"currIdentifier";
MKPinAnnotationView *annotationView =
(MKPinAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc]
initWithAnnotation:annotation
reuseIdentifier:identifier];
} else {
annotationView.annotation = annotation;
}
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
annotationView.tag = self.currIdentifier;
// Create a UIButton object to add on the
UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[rightButton setTitle:annotation.title forState:UIControlStateNormal];
[annotationView setRightCalloutAccessoryView:rightButton];
/*
UIButton *leftButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
[leftButton setTitle:annotation.title forState:UIControlStateNormal];
[annotationView setLeftCalloutAccessoryView:leftButton];
*/
return annotationView;
}
But I see that the class equivalence fails. Can you tell me what I'm doing wrong?
I think what I want, in simple words, is, how can I send some data (NSDictionary*) along with a annotation such that I can retrieve it whenever I want?
Please dont tag this as repeated question or so. I have tried many questions, googling etc. but couldn't find a suitable solution for this.

Answer 1

Here You can also set NSMutableDictionary instand of NSString.
Create custom AnnotationView:
#import <MapKit/MapKit.h>
#interface AnnotationView : MKPlacemark
#property (nonatomic, readwrite, assign) CLLocationCoordinate2D coordinate;
#property (nonatomic, strong) NSString *title; //Here You cam set `NSMutableDictionary` instand of `NSString`
#property (nonatomic, strong) NSString *subtitle; //Here You cam set `NSMutableDictionary` instand of `NSString`
#end
And in .m file
#import "AnnotationView.h"
#implementation AnnotationView
- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate addressDictionary:(NSDictionary *)addressDictionary
{
if ((self = [super initWithCoordinate:coordinate addressDictionary:addressDictionary]))
{
self.coordinate = coordinate;
}
return self;
}
#end
// Use Annotation Add #import "AnnotationView.h" in your relevant .m file:
CLLocationCoordinate2D pCoordinate ;
pCoordinate.latitude = LatValue;
pCoordinate.longitude = LanValue;
// Create Obj Of AnnotationView class
AnnotationView *annotation = [[AnnotationView alloc] initWithCoordinate:pCoordinate addressDictionary:nil] ;
annotation.title = #"I m Here";
annotation.subtitle = #"This is Sub Tiitle";
[self.mapView addAnnotation:annotation];

Answer 2

I couldn't find exact way to implement custom data variables or the reason why my class equivalence fails. But I figured out a way to over come this kind of situation. This might be redundant in method, but still works like a charm.
So the idea is to use the tagging system in control button. I observed that every time I send a message to my map view to add a annotation it immediately calls my viewforannotation method. Since I'm iterating through an array, I maintained a index global pointer, with which I set tag of the control button. Later when the button is clicked, I retrieve the tag and use it to get the object I want.
Anyone else have any alternative or direct solution, please do post.