MKPinAnnotationView not display properly - ios

Question

The annotationView bubble size is too small 9 out of 10 times.
I call [self.mapView selectAnnotation:self.selectedVenue animated:YES]; to show annotation view when select a row. Whether I set animated: YES or NO it still displays wrong size. However, if I increase size of map view height to at lease 200 pixels, everything looks fine except for the map view is too big for 3.5" screen.
I want the map view to be this size and annotation bubble to cover the title and subtitle correctly.
image: https://dl.dropboxusercontent.com/u/5105730/anno.png
Here's how I create my annotation view.
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
if ([annotation isKindOfClass:[FSVenue class]]) {
static NSString *PlaceAnnotationIdentifier = #"Place Identifier";
MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:PlaceAnnotationIdentifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:PlaceAnnotationIdentifier];
}
annotationView.annotation = annotation;
UIButton *calloutButton = [UIButton buttonWithType:(UIButtonTypeContactAdd)];
calloutButton.tintColor = self.themeColor;
annotationView.enabled = YES;
annotationView.pinColor = MKPinAnnotationColorGreen;
annotationView.canShowCallout = YES;
annotationView.rightCalloutAccessoryView = calloutButton;
annotationView.animatesDrop = YES;
return annotationView;
}
return nil;
}

Answer 1

You have to zoom the visible rect of your mapview after adding your annotations like this.
[self.yourMapview addAnnotations:self.yourAnnotationsArray];
[self zoomToAnnotations];
Call this method after adding your annotation like this
-(void)zoomToAnnotations{
MKMapRect zoomRect = MKMapRectNull;
for (_yourAnnotation in self.yourMapView.annotations) {
MKMapPoint annotationPoint = MKMapPointForCoordinate(_yourAnnotation.coordinate);
MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0.1, 0.1);
if (MKMapRectIsNull(zoomRect)) {
zoomRect = pointRect;
}else{
zoomRect = MKMapRectUnion(zoomRect, pointRect);
}
}
if (zoomRect.size.width == 0.10) /* for single annotation available in map */
{
zoomRect = MKMapRectMake(zoomRect.origin.x, zoomRect.origin.y, 100000, 100000);
}
[[self yourMapView] setVisibleMapRect:zoomRect edgePadding:UIEdgeInsetsMake(50, 50, 50, 50) animated:YES];
}