I’ve mentioned a number of projects for working with maps such as DBMApSelectorViewController allowing you to create an outline of a specific area on a map quickly and easily.
Here’s an open source Swift library for handling geographic object models, and topographical options with support for MapKit and many other nice features called GeoSwift from Andrea Cremaschi.
With GeoSwift you can perform features such as drawing polygons onto your maps, and also perform other operations on geometries such as gathering the intersection and difference between geometries. GEOSwift includes a GEOJSON parser so you can easily use GEOJSON data.
This image from the readme shows geometries drawn on a map:
You can find GEOSwift on Github here.
A nice library for creating geometry on maps.
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