Google Maps markers not removing iOS

Question

I'm running a thread to fetch drivers location every 10 seconds and want to remove the added markers from the map but it doesn't work..

My code:

-(void)APiResponse:(id)returnJson
{        
        [googleMapsDriverPin setMap:nil];
        googleMapsDriverPin = nil;

        NSMutableArray *driverPins = [[NSMutableArray alloc]init];
        for (int x = 0; x < [[returnJson valueForKey:@"drivers"] count]; x++) {
            CLLocation *driverLocations = [[CLLocation alloc]initWithLatitude:[[[[returnJson valueForKey:@"drivers"] objectAtIndex:x] valueForKey:@"driver_latitude"] doubleValue] longitude:[[[[detail valueForKey:@"drivers"] objectAtIndex:x] valueForKey:@"driver_longitude"] doubleValue]];
            [driverPins addObject:driverLocations];
        }

        for (CLLocation *newLocation in driverPins) {
            googleMapsDriverPin = [[GMSMarker alloc] init];
            [googleMapsDriverPin setPosition:newLocation.coordinate];
            [googleMapsDriverPin setAnimated:YES];
            [googleMapsDriverPin setTitle:@"title"];
            [googleMapsDriverPin setSnippet:@"snippet"];
            [googleMapsDriverPin setIcon:[GMSMarker markerImageWithColor:[UIColor blackColor]]];
            [googleMapsDriverPin setMap:googleMaps];
         }
}

It just keeps adding and adding every 10 seconds and not removing, please help! Thanks!

Answer 1

Its a kind of quick and dirty option but if you wanted to go that way GMSMarker has a userData property which you could use to tag the driver pins

- (void)apiResponse:(id)returnJson
{        
    for (GMSMarker *pin in self.googleMaps.markers) {
        if (pin.userData == @"Driver Pin"){ 
            pin.map = nil; 
        }
    }

    ...

    for (CLLocation *newLocation in driverPins) {
        googleMapsDriverPin = [[GMSMarker alloc] init];
        ...
        [googleMapsDriverPin setUserData:@"Driver Pin"];
    }
}

Update:

[self.googleMapsView clear];