An easy way to draw a curvy line between two points on a map.

? Features

  • [x] Display a curve on a map
  • [x] Display a straight line on a map
  • [x] Customise the radius multiplier

? Requirements

  • iOS 8.0+
  • Swift 4.2+


There are several methods to install curvyRoute:


Add curvyRoute specs to your Podfile:

pod 'curvyRoute'

Add curvyRoute as dependency in the podspec of the module that contains the strings files:

s.dependency 'curvyRoute'

Note: If your app is not modularized, simply add pod 'curvyRoute' to your Podfile too.


import MapKit
import UIKit
import curvyRoute

class ViewController: UIViewController, MKMapViewDelegate {
    @IBOutlet weak var mapView: MKMapView!

    override func viewDidAppear(_: Bool) {
        mapView.delegate = self

    func mapView(_: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        if let lineOverlay = overlay as? LineOverlay {
            return MapLineOverlayRenderer(lineOverlay)
        return MKOverlayRenderer(overlay: overlay)

    private func addOverlays() {
		let pointA = CLLocationCoordinate2DMake(41.375024, 2.149118) // Plaça d'Espanya, Barcelona
		let pointB = CLLocationCoordinate2DMake(41.380994, 2.185771) // Plaça Pau Vila, 1, Barcelona
        mapView.addOverlay(LineOverlay(origin: pointA, destination: pointB))
        let arc = ArcOverlay(origin: pointA, destination: pointB,
                             style: LineOverlayStyle(strokeColor: .systemTeal, lineWidth: 4, alpha: 1))
        arc.radiusMultiplier = 0.5

What is radiusMultiplier ?

This property will influence the shape of the arc. The default value is 1.


?‍? Todo

  • [x] Animate the polyline
  • [x] ...