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POOffline reverse geocoding on iOS
 

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    <p>There are lots of existing questions relating to this issue, but I have looked at as many of them as I could find and did not get an answer.</p> <p>I'm trying to perform an offline reverse geocoding lookup on iOS based on a latitude and longitude. I'd like to be able to provide a latitude and longitude, and be provided with the country in which that point lies. I can do this with Geonames (such as: <a href="http://api.geonames.org/countryCode?lat=45.03&amp;lng=8.2&amp;username=demo" rel="nofollow">http://api.geonames.org/countryCode?lat=45.03&amp;lng=8.2&amp;username=demo</a>), but I need a similar ability offline, without Internet functionality on the device.</p> <p><code>CLLocation</code> does not provide offline services that work reliably enough for what I'm doing, it relies on caches made while you were previously online, etc. Messy.</p> <p>I've tried this: <a href="https://github.com/drodriguez/reversegeocoding" rel="nofollow">https://github.com/drodriguez/reversegeocoding</a> but haven't had any luck, it requires some slightly complex / confusing Terminal installations using something called Thor which I've never heard of, and was throwing up a variety of errors, so I bailed on it.</p> <p>I've found a few downloadable maps, but these seem to be even more complicated, and worryingly, hundreds of megabytes or even gigabytes in size – much beyond the scope of an iOS app. I only need countries, nothing smaller than that (cities, streets, locations, etc.) so I think I should be able to get a much smaller file.</p> <p>So my key question is: is there some pre-existing database or tool, preferably with iOS support, that I can feed a latitude/longitude, and get a country? And, if not, what steps should I take to get such functionality working on my own?</p> <p>Thanks in advance.</p>
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    1. COIf that would be enough for what your app does, you can approximate the lookup with the locations of the airports (see http://www.openflights.org/data.html) or cities (http://en.wikipedia.org/wiki/List_of_cities_by_longitude)
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