Estou desenvolvendo um aplicativo que usaMKMapView. Eu tenho várias anotações nele. Agora, quero exibir uma imagem de anotação personalizada para o pino. Eu criei uma classe personalizada para MapViewAnnotation.

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface MapViewAnnotation : NSObject <MKAnnotation>

@property (nonatomic,copy) NSString *title;
@property (nonatomic,copy) NSString *subtitle;
@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;

-(id) initWithTitle:(NSString *) title SubTitle:(NSString *)subtitle AndCoordinate:(CLLocationCoordinate2D)coordinate;

@end

#import "MapViewAnnotation.h"

@implementation MapViewAnnotation

@synthesize coordinate=_coordinate;
@synthesize title=_title;

-(id) initWithTitle:(NSString *) title SubTitle:(NSString *)subtitle AndCoordinate:(CLLocationCoordinate2D)coordinate;
{
    self =  [super init];
    _title = title;
    _coordinate = coordinate;
    _subtitle = subtitle;
    return self;
}

@end

Estou recebendo vários lat-long da API e exibindo desta maneira:

[self.map_parking addAnnotations:[self createAnnotations]];

- (NSMutableArray *)createAnnotations
{
    NSMutableArray *annotations = [[NSMutableArray alloc] init];

    for (NSDictionary *row in arrfinal) {
        NSNumber *latitude = [row objectForKey:@"latitude"];
        NSNumber *longitude = [row objectForKey:@"longitude"];
        NSString *title = [row objectForKey:@"title"];
        NSString *subtitle = [row objectForKey:@"subtitle"];
        NSString *rate = [row objectForKey:@"rate"];

        //Create coordinates from the latitude and longitude values
        CLLocationCoordinate2D coord;
        coord.latitude = latitude.doubleValue;
        coord.longitude = longitude.doubleValue;

        MapViewAnnotation *annotation = [[MapViewAnnotation alloc] initWithTitle:title SubTitle:subtitle AndCoordinate:coord];

        MKAnnotationView *av = [map_parking viewForAnnotation:annotation];
        if ([rate isEqualToString:@"0.00"])
        {
            av.image = [UIImage imageNamed:@"marker2"];
        }
        else
        {
            av.image = [UIImage imageNamed:@"marker"];
        }
        [annotations addObject:annotation];

    }
    return annotations;
}

Para exibir anotação, estou usando esta referência de método por este link:MKMapView: em vez de Pin de anotação, uma exibição personalizada

-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKAnnotationView *pinView = nil;
    if(annotation != map_parking.userLocation)
    {
        static NSString *defaultPinID = @"com.invasivecode.pin";
        pinView = (MKAnnotationView *)[map_parking dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
        if ( pinView == nil )
            pinView = [[MKAnnotationView alloc]
                       initWithAnnotation:annotation reuseIdentifier:defaultPinID];

        pinView.canShowCallout = YES;
        //pinView.animatesDrop = YES;
        for (int i=0; i<arrrates.count; i++)
        {
            if ([[arrrates objectAtIndex:i] isEqualToString:@"0.00"])
            {
                pinView.image = [UIImage imageNamed:@"marker1"];
            }
            else if ([[arrrates objectAtIndex:i] isEqualToString:@"100.71"])
            {
                pinView.image = [UIImage imageNamed:@"marker2"];
            }
            else
            {
                pinView.image = [UIImage imageNamed:@"marker3"];
            }
        }

    }
    else {
        [map_parking.userLocation setTitle:@"I am here"];
    }

    return pinView;
}

Neste métodoif-else condição funcionando bem, mas todas as imagens dos pinos exibem a última condição.