Determining when a user enters a building in iOS

Question

I'm writing a program similar to runkeeper via Swift that keeps track of a user's movement. I do not have any trouble in monitoring the user's location, however, I am wondering if there is a way to determine whether a user has entered a building or not.

Geofencing crossed my mind but that would mean determining every building a user enters.

Another thought that came to mind was continuously firing code that determines the user's signal (but this seems a bit annoying--although if this is the only choice I'm left with I'll do this). My reasoning behind this is if I cannot determine whether the user has entered a building or not, I can at least detect when they have a poor signal through the CoreTelephony framework.

Whenever a run is initialized (through an object I call WalkingEngine -- note it hasn't been implemented here yet), I use that WalkingEngine as part of my Reachability helper's custom init and begin the process of continuously sending that signal (there might be a better way to do this, such as wait for when the signal actually turns poor?) This is the code:

import Foundation
import CoreTelephony


//When can we detect whether we have a connection or not? You'll have to lose a connection.

//MARK: Initialize the actual enum? We don't know where it's going to implemented otherwise,

enum ConnectionQuality : Int {
        case EBWConnectionQualityZero, EBWConnectionQualityLo, EBWConnectionQualityHi
    }



class ReachabilityHelper {
    //TODO Determine best initialization method. Check 
    //WalkEngine Init for reference


    //MARK: Check Phone's general connection status
//    func checkForGPSConnection () {
//        
//        let reachability: Reachability
//        let networkStatus = reachability.currentReachabilityStatus
//        
//        switch (networkStatus) {
//            case .NotReachable
//            
//        }
//        
//        
//    }



    //MARK: Check for the Phone's Connection Type
    func radioAccessType() -> String {
        //Print the current telephone's connection type for development
        //purposes. 
        var radioTelephoneInfo: CTTelephonyNetworkInfo
        print(radioTelephoneInfo)
        radioTelephoneInfo.currentRadioAccessTechnology
    }

    //MARK: Check for the quality of the Connection Type 
        //TODO This is an incredibly ugly if-else statement. There are much more elegenat ways
        //to express this via Swift. This code was written quickly so as to solve the problem.
    func connectionQualityForTechnology(ebwConnectionQuality: ConnectionQuality) -> (radioAccessTechnology: String) {

        if radioAccessTechnology == CTRadioAccessTechnologyGPRS {
            return ConnectionQuality.EBWConnectionQualityZero
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyEdge{
            return ConnectionQuality.EBWConnectionQualityZero
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyWCDMA {
            return ConnectionQuality.EBWConnectionQualityLo
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyHSDPA {
            return ConnectionQuality.EBWConnectionQualityLo
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyHSUPA {
            return ConnectionQuality.EBWConnectionQualityLo
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyCDMA1x {
            return ConnectionQuality.EBWConnectionQualityZero
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyCDMAEVDORev0 {
            return ConnectionQuality.EBWConnectionQualityLo
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyCDMAEVDORevA {
            return ConnectionQuality.EBWConnectionQualityLo
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyCDMAEVDORevB {
            return ConnectionQuality.EBWConnectionQualityLo
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyeHRPD {
            return ConnectionQuality.EBWConnectionQualityHi
        }
        else if radioAccessTechnology == CTRadioAccessTechnologyLTE {
            return ConnectionQuality.EBWConnectionQualityHi
        }

        return ConnectionQuality.EBWConnectionQualityHi
    }

}