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我正在通过 Swift 编写一个类似于 runkeeper 的程序来跟踪用户的移动。我在监控用户的位置方面没有任何问题，但是，我想知道是否有办法确定用户是否进入了建筑物。

我想到了地理围栏，但这意味着确定用户进入的每一栋建筑。

想到的另一个想法是不断触发确定用户信号的代码（但这似乎有点烦人——尽管如果这是我剩下的唯一选择，我会这样做）。我的理由是，如果我无法确定用户是否进入了建筑物，我至少可以通过 CoreTelephony 框架检测到他们何时信号不佳。

每当初始化一次运行时（通过我称为 WalkingEngine 的对象——注意它还没有在此处实现），我使用该 WalkingEngine 作为我的可达性助手的自定义初始化的一部分，并开始持续发送该信号的过程（可能有一个更好的方法来做到这一点，例如等待信号实际上变差的时候？）这是代码：

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
    }

}
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