地图位置点的圆圈放大效果是怎样弄上去的？
- (MKAnnotationView *)mapView:(MKMapView *)aMapView viewForAnnotation:(id <MKAnnotation>)annotation{ if(![annotation isKindOfClass:[MyAnnotation class]]) // Don't mess user location return nil; MKAnnotationView *annotationView = [aMapView dequeueReusableAnnotationViewWithIdentifier:@"spot"]; if(!annotationView) { annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"spot"]; annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; [(UIButton *)annotationView.rightCalloutAccessoryView addTarget:self action:@selector(openSpot:) forControlEvents:UIControlEventTouchUpInside]; annotationView.enabled = YES; annotationView.canShowCallout = YES; annotationView.centerOffset = CGPointMake(7,-15); annotationView.calloutOffset = CGPointMake(-8,0); } // Setup annotation view annotationView.image = [UIImage imageNamed:@"pinYellow.png"]; // Or whatever return annotationView;}