For the impatient check out the source code and might I warn you that I use iOS 8.0 APIs.
I’ve been watching WWDC 2014 lately and one of the most interesting talk was about Indoor Positioning, the potential is amazing .. or super-annoying :D, sort of like a heat-seeking pop-up ad that follows you around, and of course iOS8 offers a few ways to lessen the pain such as the “What’s near me” app store.
Although is not yet available but I thought it’ll be fun to at least have the basic function running, using CoreLocation is pretty straightforward, the only caveat for iOS8 is;
The NSLocationAlwaysUsageDescription and NSLocationWhenInUseUsageDescription are mandatory, you need to provide something that will make sense to the user.
<string>Please let me always stalk you</string>
<string>Please let me stalk you only when you use it</string>
and you need to request the authorization.
Other important parts are the battery usage and the user’s flow which surprisingly wasn’t described clearly at the guide, I’ve devised my own so hopefully it will enlighten a few.