Plot two different color of mapview pin - ios

Question

I'm trying to display mapview with an array of coordinates. So, i load the latitudes and longitudes from array where those are contains. It is showing perfectly. Now, i want to display one paritcular latitude & longitude with different color pin. I've referred this answer no such different i can't see.
ViewController.m
-(void)showMap:
{
...
...
DataProvider *d = [DataProvider getInstance];
NSInteger numb = sender.view.tag;
d.colorlatitude = [[arraxy objectAtIndex:numb] objectForKey:#"lat"];
d.colorlongitude = [[arraxy objectAtIndex:numb] objectForKey:#"lng"];
[d._address removeAllObjects];
[arraxy removeObjectAtIndex:sender.view.tag];
d._address = arraxy;
MapViewController *map = [[MapViewController alloc]initWithNibName:#"MapViewController" bundle:nil];
[self.navigationController pushViewController:map animated:YES];
}
MapViewController.m
-(void)viewWillAppear:(BOOL)animated
{
DataProvider *d = [DataProvider getInstance];
[_mapView removeAnnotations:_mapView.annotations];
RegisterViewController *appDelegate = [[RegisterViewController alloc]init];
[_mapView setShowsUserLocation:YES];
[_mapView setRegion:MKCoordinateRegionMakeWithDistance([appDelegate.locationManager location].coordinate, 1000, 1000)];
[_mapView setUserTrackingMode:MKUserTrackingModeNone];
MKCoordinateRegion rregion = {{0.0,0.0},{0.0,0.0}};
rregion.center.latitude = [d.colorlatitude floatValue];
rregion.center.longitude = [d.colorlongitude floatValue];
rregion.span.latitudeDelta=0.001f;
rregion.span.longitudeDelta=0.001f;
[_mapView setRegion:rregion];
MapviewAnnotations *add = [[MapviewAnnotations alloc]init];
add.coordinate = rregion.center;
[_mapView addAnnotation:add];
if (d._address)
{
for (int i=0; i<[d._address count]; i++)
{
NSDictionary *dic=[d._address objectAtIndex:i];
MKCoordinateRegion region={{0.0,0.0},{0.0,0.0}};
region.center.latitude=[[dic objectForKey:#"lat"]floatValue];
region.center.longitude=[[dic objectForKey:#"lng"]floatValue];
region.span.latitudeDelta=0.001f;
region.span.longitudeDelta=0.001f;
[_mapView setRegion:region];
MapviewAnnotations *ann=[[MapviewAnnotations alloc]init];
ann.coordinate=region.center;
[_mapView addAnnotation:ann];
}
}
[super viewWillAppear:YES];
}
and my MKMapView's delegate method is
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
if (![annotation isKindOfClass:[MapviewAnnotations class]])
{
return nil;
}
static NSString *reuseId = #"currentloc";
MKPinAnnotationView *annView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:reuseId];
if (annView == nil)
{
annView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseId];
annView.animatesDrop = NO;
annView.canShowCallout = YES;
annView.calloutOffset = CGPointMake(-5, 5);
}
else
{
annView.annotation = annotation;
}
DataProvider *mvAnn = [DataProvider getInstance];
if (mvAnn.colorlatitude) // here i'm checking the condition.
{
annView.pinColor = MKPinAnnotationColorGreen;
}
else
{
annView.pinColor = MKPinAnnotationColorRed;
}
return annView;
}
I'm just writting the condition if the co-ordinate is there i've to plot the green color pin to that particular coordinate only. How to achieve this?

Answer 1

The difference between your code and the one Hinata has referred you to is that the if statement in the other code uses a value (yesno) on the annotation it is currently drawing to decide what colour to use. You are getting a value from DataProvider but not telling it which annotation you are drawing, so the instance it gives you is just what ever the instance method feels like returning at the time the map is asking for the pin. You need to tell it what you're drawing for it to decide what to put into colorlatitude

Answer 2

I've done this through some flags like below inside of my - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
MapviewAnnotations *mvAnn = (MapviewAnnotations *)annotation;
if (mvAnn.flag == 1)
{
annView.pinColor = MKPinAnnotationColorGreen;
}
else if (mvAnn.flag == 10)
{
annView.pinColor = MKPinAnnotationColorPurple;
}
else
{
annView.pinColor = MKPinAnnotationColorRed;
}
In my viewWillAppear i received the coordinates from DataProvider and assigned with separate MapviewAnnotations with flags and differentiate it with three type of pins simply.
Cheers!