https://www.mapbox.com/mapbox.js/example/v1.0.0/scale-control/
I've found this functionality on the Javascript Examples with MapBox. Just wondering if anyone has come across a way to do this with the Objective-C/iOS SDK version.
I tried using Legends in TileMill but with no luck, plus I'm not entirely sure that the Legends get exported when you export the MBTiles file.