ESRI officially released a few weeks ago its API for the iOS.
http://resources.arcgis.com/content/arcgis-ios
The video gives some worked examples of the API in action. Please note the ESRI word of choice 'Leverage' used remarkably early in the video even for ESRI..........
A colleague and I have been using the beta version of this for a few months now and have an 'App' going live in a UK City within the next couple of months and a proof of concept for another city. This is a great step forward for the providing and sharing of geospatial data to a demographic that wouldn't neccessarily be interacted with otherwise by Local Authorities.
A note of caution for UK users is that the API does not have the out of the box capacity to project to British National Grid from the APIs native WGS84, this becomes an issue when using the GPS to locat the phone, giving a positional error. There has been no support from ESRI on this and requires it to be hard coded by the user to do the projection.
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