How to draw a dashed line on iOS app?

[chatwyn]

How to draw a dashed line on iOS app ?

[incanus]

Hi @chatwyn. Please send usage questions in to https://www.mapbox.com/help/ per the contributing guidelines.

[chatwyn]

I have't find setting lind dashed in the MGLMapViewDelegate . I only find color alpha and lineWidth.

[1ec5]

#1734 tracks adding a dedicated API for this. In the meantime, in iOS SDK v3.4.0 (currently in alpha testing):

1. Create an MGLGeoJSONSource containing the line data.
2. Create an MGLLineStyleLayer based on that source, and set its lineDasharray property to something like @[@1, @2].
3. Add the style layer to the map view.

[chatwyn]

thanks

[eimantas]

@1ec5 I couldn't find any references to MGLGeoJSONSource. Is the described approach still relevant?

[jmkiley]

You may find this example helpful: https://www.mapbox.com/ios-sdk/examples/runtime-add-line/

[1ec5]

MGLGeoJSONSource was renamed MGLShapeSource in #7334 because developers usually interact with it in conjunction with MGLShapes rather than GeoJSON source.

[songyuyang0918]

@1ec5 Hello! Now, if you want to make the fillLayer edges into dotted lines, can you only add another layer of lineLayer instead of making changes on the fillLayer?
If so, I will do so, but I wonder if there is an expression in lineDashPattern that allows me to match attributes in Source to show dashed lines.