Positioning a custom MKAnnotationView

Question

I create a custom MKAnnoationView as follows:

- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    static NSString* AnnotationIdentifier = @"AnnotationIdentifier";
    MKAnnotationView* customPinView = [[MKAnnotationView alloc]
                                           initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier];

    UIImage *pinImage = [PowerPlantAnnotation getAnnotationImageForEnergySource:((PowerPlantAnnotation*)annotation).energySource];
    customPinView.image = pinImage;
    return customPinView;
}

I get the image that I want positioned more or less in the right spot, but not quite. My image looks like this:

enter image description here

I want the bottom point of the tear drop to point to my annotation map coordinate, like the standard pin view points to the map coordinate. How can I accomplish this? Currently it looks a bit more like my image is centered on the map coordinate.

score 15 · Accepted Answer · answered Dec 12 '12 at 20:48

15

By default annotation view center is placed at the annotation coordinate. To adjust view position set its centerOffset property:

annotationView.centerOffset = CGPointMake(0.0f, -annotationViewHeight/2);

answered Dec 12 '12 at 20:48

Vladimir

170,431
36
387
313

in this case. the center of the view aligns at the exact coordinate position. The base of the pin of should be at the coordinate for accuracy. – carbonr May 27 '16 at 12:16

Positioning a custom MKAnnotationView

1 Answers1