unable to display custom Annotations on the map in iPhone - iphone

Question

I am trying to add annotations on my mapview but I am not able to add them. Can someone suggest me where I am doing wrong? Code: Code to add the map:
mapview = [[MKMapView alloc] initWithFrame:CGRectMake(10, 175, 300, 268)];
mapview.delegate = self;
mapview.userInteractionEnabled = TRUE;
[mapview setZoomEnabled:TRUE];
[mapview setScrollEnabled:TRUE];
mapview.showsUserLocation = TRUE;
[self.view addSubview:mapview];
//adding annotations in another method:
for (id annotation in mapview.annotations) {
[mapview removeAnnotation:annotation];
}
for(int i =0;i<arrEventList.count;i++){
CLLocationCoordinate2D theCoordinate;
theCoordinate.latitude = [[NSString stringWithFormat:#"%#",[(NSDictionary*)[arrEventList objectAtIndex:i] objectForKey:#"lat"]] floatValue];
theCoordinate.longitude = [[NSString stringWithFormat:#"%#",[(NSDictionary*)[arrEventList objectAtIndex:i] objectForKey:#"lng"]] floatValue];
MyLocation *annotation = [[[MyLocation alloc] initWithName:[(NSDictionary*)[arrEventList objectAtIndex:i] objectForKey:#"event"] address:[(NSDictionary*)[arrEventList objectAtIndex:i] objectForKey:#"place"] coordinate:theCoordinate] autorelease];
[mapview addAnnotation:annotation];
//[annotations addObject:myAnno.annotation];
}
// delegate method:
- (MKAnnotationView *) mapView: (MKMapView *) mapView viewForAnnotation: (id<MKAnnotation>) annotation {
static NSString *identifier = #"MyLocation";
if ([annotation isKindOfClass:[MyLocation class]]) {
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.image=[UIImage imageNamed:#"annotation.png"];//here we use a nice image instead of the default pins
return annotationView;
}
return nil;
}
Above delegate method is only called for self location but it is not called for other annotations that I want to add.
Can someone point me to my mistakes
#interface MyLocation : NSObject <MKAnnotation> {
NSString *_name;
NSString *_address;
CLLocationCoordinate2D _coordinate;
}
#property (copy) NSString *name;
#property (copy) NSString *address;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate;
#end
//Mylocation class:
#implementation MyLocation
#synthesize name = _name;
#synthesize address = _address;
#synthesize coordinate = _coordinate;
- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate {
if ((self = [super init])) {
_name = [name copy];
_address = [address copy];
_coordinate = coordinate;
}
return self;
}
- (NSString *)title {
if ([_name isKindOfClass:[NSNull class]])
return #"Unknown charge";
else
return _name;
}
- (NSString *)subtitle {
return _address;
}

Answer 1

I found the problem. My code is correct. The values of latittude and longitudes were some how interchanged. My mistake but I have corrected it now