I searched over the internet but I couldn't find an answer to this. Is possible to draw polygon filled with some pattern? I don't wanna use 3rd party libraries. I would like to achieve something similar to this: polygon with pattern
Yes you can do this.
UIColor
has an initializer for pattern images.
guard let image = UIImage(named: "Name of the asset") else { return }
let color = UIColor(patternImage: image)
Then in your overlay renderer delegate method, you can simply assign it to your fill color.
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
// Renderer code
yourRenderer.fillColor = color
// Return your renderer
}