MKAnnotationView - Set two different Pin colours - ios

Question

I'm using Parse.com as a backend and i want to show Geopoints on my map.
Every Geopoint is also connected with a database boolean field true or false.
How can I show a green pins colour for the "true" gepoint and red pins for the "false" Geopoint?
Here is code for the MapViewController.m
#property (weak, nonatomic) IBOutlet MKMapView *mapView;
I have a function to perform the query against the parse.com database to return me all location data. It is called within the viewDidLoad Method.
- (void)viewDidLoad
{
[super viewDidLoad];
[self getAllStations];
}
Then I set the annotationView like this:
#pragma mark - MapViewDelegate
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)geoPointAnnotation {
static NSString *MapViewAnnotationIdentifier = #"Places";
MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:MapViewAnnotationIdentifier];
if (geoPointAnnotation == mapView.userLocation) {
return nil;
} else {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:geoPointAnnotation reuseIdentifier:MapViewAnnotationIdentifier];
annotationView.pinColor = MKPinAnnotationColorGreen;
annotationView.canShowCallout = YES;
annotationView.draggable = YES;
annotationView.animatesDrop = YES;
}
return annotationView;
}
Here is the Code for the MapViewAnnotation.m (Object):
#import "MapViewAnnotation.h"
#import "Parse/Parse.h"
#interface MapViewAnnotation ()
#property (nonatomic, strong) PFObject *object;
#end
#implementation MapViewAnnotation
#pragma mark - Initialization
- (id)initWithObject:(PFObject *)aObject {
self = [super init];
if (self) {
_object = aObject;
PFGeoPoint *geoPoint = self.object[#"location"];
[self setGeoPoint:geoPoint]; }
return self;
}
- (void)setGeoPoint:(PFGeoPoint *)geoPoint {
_coordinate = CLLocationCoordinate2DMake(geoPoint.latitude, geoPoint.longitude);
NSString *streetName = self.object[#"adress"];
_title = [NSString stringWithFormat:#"%#", [_object objectForKey:#"name"]];
[PFGeoPoint geoPointForCurrentLocationInBackground:^(PFGeoPoint *currentLocationGeoPoint, NSError *error) { //Get current Location
if (!error) {
PFGeoPoint *distanceGeoPoint = [_object objectForKey:#"location"];
double distanceDouble = [currentLocationGeoPoint distanceInKilometersTo:distanceGeoPoint];
//NSLog(#"Distance: %.1f",distanceDouble);
_subtitle = [NSString stringWithFormat:#"%# - Distance: %.1f km", streetName, distanceDouble];
}
}];
}
#end
Can anyone give me a hint how I can show green and red pins based on a boolean?
Thanks in advance!

Answer 1

You can customize the pin annotation view,
- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>)annotation
{
if ([annotation isKindOfClass:[MKUserLocation class]])
{
return nil;
}
MKAnnotationView *flagAnnotationView =
[self.mapView dequeueReusableAnnotationViewWithIdentifier:SFAnnotationIdentifier];
if (flagAnnotationView == nil)
{
MKPinAnnotationView *customPinView = [[MKPinAnnotationView alloc]
initWithAnnotation:annotation reuseIdentifier:SFAnnotationIdentifier];
if(annotation.coordinate.latitude==42.0000 && annotation.coordinate.longitude==-87.65000)
//you have to keep the latitude and longitude of the pins to which you can set the colour of the pin according to that latlong
customPinView.pinColor = MKPinAnnotationColorGreen;
else
customPinView.pinColor = MKPinAnnotationColorRed;
customPinView.animatesDrop = YES;
customPinView.canShowCallout = YES;
return customPinView;
}
else
{
flagAnnotationView.annotation = annotation;
}
return flagAnnotationView;
return nil;
}

Answer 2

in your annotation.h file declare a nsstring as below
#property (strong , nonatomic)NSString *pinColour;
and in the implemention file do the below to check for the colour
-(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id)annotation{
//other code above
if ([[annotation pinColour] isEqualToString:#"Red"]) {
annotationView.pinColor = MKPinAnnotationColorRed;
}else{
annotationView.pinColor = MKPinAnnotationColorGreen;
}
}
and inside the for loop of parse, tag the relevant with to pass wither colour
annotation.pinColour = #"Red";

Answer 3

Can anyone give me a hint how I can show green and red pins based on a boolean?
BOOL colorRed = YES;
if (colorRed) annotationView.pinColor = MKPinAnnotationColorRed;
else annotationView.pinColor = MKPinAnnotationColorGreen;
Is that what you mean?