I’ve mentioned a few components for working with maps, such as P2MSRoutingView allowing you to overlay routes on a map.
Here’s an open source component providing a selection of a circular region on a MKMapView called DBMapSelectorViewController from Denis Bogatyrev.
DBMapSelectorViewController displays a great looking overlay on the selected area with customizable colors, with the radius of the selected area displayed. The component is configured by supplying the coordinates, and radius.
This image from the readme shows DMapSelectionVIewController in action:
You can find DBMapSelectorViewController on Github here.
A nice component for illustrating an area on a map view.
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