ios - Make a UIImage from a MKMapView

Question

I want to create a UIImage from a MKMapView. My map is correctly displayed in the view, however the UIImage produced is just a gray image. Here's the relevant snippet.

UIGraphicsBeginImageContext(mapView.bounds.size);
[mapView.layer renderInContext:UIGraphicsGetCurrentContext()];
mapImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Anyone know how to make a UIImage using MapKit?

Answer 1

I am using the same code that is tested with ios sdk 4.1 and works fine. So, when map is already displayed to user and user press the button this action will be called:

UIImage *image = [mapView renderToImage];

and here is the wrapper function realized as UIView extension:

- (UIImage*) renderToImage
{
  UIGraphicsBeginImageContext(self.frame.size);
  [self.layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();  
  return image;
}

So, the problem is not in that code part.