Dotted line on map view

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时光说笑
时光说笑 2021-02-19 09:43

I can create a line between two points fairly easy with the below code (part of it anyways) How could I make the line dotted instead of solid? Also would it be possible to cha

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  • 2021-02-19 09:44

    You can use the lineDashPattern property to create the pattern you want for the line.

    MKPolylineRenderer is a subclass of MKOverlayPathRenderer which has that property and a few others (see the link to the documentation).

    For example, this sets the pattern to a line 2 points long followed by a 5 point gap. The pattern is repeated for the entire length of the polyline.

    renderer.lineDashPattern = @[@2, @5];
    


    For the opacity, you can either apply an alpha to the strokeColor:

    renderer.strokeColor = [[UIColor orangeColor] colorWithAlphaComponent:0.5];
    

    or set the alpha property:

    renderer.alpha = 0.5;
    

    Not sure what you mean by "the longer the line is" part of the question.

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  • 2021-02-19 09:57

    Answer in Swift

    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
        guard let polyline = overlay as? MKPolyline else {
            fatalError("Not a MKPolyline")
        }
    
        let renderer = MKPolylineRenderer(polyline: polyline)
    
        renderer.strokeColor = #colorLiteral(red: 0.1764705926, green: 0.4980392158, blue: 0.7568627596, alpha: 1)
        renderer.lineWidth = 8
        renderer.lineDashPattern = [0, 10]
    
        return renderer
    } 
    

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