Question

the problem is this:

I have a mapkit view with 2 different colors pinpoint. Now i have added in a segmented control to display different map types ie. satellite, standard and hybrid. When my application loads, its correct with 2 different colors. However, when i select the segments, all my pinpoints will change to red colour.

Is there a way to reload all my data and pinpoints such that every segment will give me the same initial view??

- (IBAction) segmentAction:(id)sender 
    {
    UISegmentedControl* segCtl = sender ;

    if( [segCtl selectedSegmentIndex] == 0 )
    { 
        NSLog(@"first view");
        _mapView.mapType=MKMapTypeStandard;

    }
    if( [segCtl selectedSegmentIndex] == 1 ) 
    { 
        NSLog(@"2nd view");
        _mapView.mapType=MKMapTypeSatellite;

    }
    if( [segCtl selectedSegmentIndex] == 2 ) 
    {

        NSLog(@"3rd view");
        _mapView.mapType=MKMapTypeHybrid;

    }


}

Answer 1

Make sure your map view controller implements the viewForAnnotation: method – if this is missing, the pin colors might get reset if the view is refreshed. For example:

- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation
{
MKPinAnnotationView *newAnnotation = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"redpin"] autorelease];
newAnnotation.pinColor = MKPinAnnotationColorRed;
newAnnotation.animatesDrop = YES;
newAnnotation.canShowCallout = YES;
return newAnnotation;
}