Different MKPinAnnotation for different data - objective-c

Question

I have 3 types of locations.
I'm getting the data from my server, then I'm parsing it and displaying the locations on the mapView.
I want to display different colors for the different types of data. 3 types = 3 colors.
How can I control this?

Answer 1

Implement the viewForAnnotation delegate method for doing this.
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
static NSString *identifier = #"MyLocation";
if ([annotation isKindOfClass:[yourAnnotationLocation class]])
{
MKAnnotationView *annotationView = (MKAnnotationView *) [_mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil)
{
annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
//if you need image you can set it like
//annotationView.image = [UIImage imageNamed:#"yourImage.png"];//here we use a nice image instead of the default pins
annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
}
else
{
annotationView.annotation = annotation;
}
if ([annotation.title isEqualToString:#"Midhun"])
{
annotationView.pinColor = MKPinAnnotationColorGreen;
}
else
{
annotationView.pinColor = MKPinAnnotationColorRed;
}
return annotationView;
}
return nil;
}
For setting custom property to your annotation add a class which confirms to MKAnnotation protocol.
#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>
#interface MyLocation : NSObject <MKAnnotation> {
NSString *_name;
NSString *_address;
int _yourValue;
CLLocationCoordinate2D _coordinate;
}
#property (copy) NSString *name;
#property (copy) NSString *address;
#property (assign) yourValue;
#property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
- (id)initWithName:(NSString*)name address:(NSString*)address coordinate:(CLLocationCoordinate2D)coordinate;
#end
This is is a nice tutorial.

Answer 2

Try this,
annotation1.subtitle = #"1st annotation";
annotation2.subtitle = #"2st annotation";
annotation3.subtitle = #"3st annotation";
Check annotation
if ([annotation.subtitle isEqualToString:#"1st annotation"])
{
//change color
}
else if ([annotation.subtitle isEqualToString:#"2st annotation"])
{
//change color
}
else if ([annotation.subtitle isEqualToString:#"3st annotation"])
{
//change color
}

Answer 3

You can do something with latitude and longitude comparison
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation { static NSString *identifier = #"yourIdentifier";
MKPinAnnotationView *pin = (MKPinAnnotationView *) [self.mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if([annotation coordinate].latitude==YourLocationLatitude)
{
pin.image=[UIImage imageNamed:#"Flag-red.png"];
}
else
{
pin.image=[UIImage imageNamed:#"Flag-green.png"];
}}