快速計算總距離iOS

Question

因此，在我目前的project我正在做一個計算駕駛摩托車時節省的排放量與一般汽車相比的方法。該功能包含兩部分，method（計算）和tracker function。主要問題是跟蹤器功能似乎根本沒有跟蹤。

我的主要問題是，如何在應用程序啓動時獲取跟蹤器功能總是跟蹤？

這是跟蹤功能

var startLocation:CLLocation! 
var lastLocation: CLLocation! 
var traveledDistance:Double = 0 

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { 

    if startLocation == nil { 
     startLocation = locations.first 
    } else { 
     if let lastLocation = locations.last { 
      let distance = startLocation.distanceFromLocation(lastLocation) 
      let lastDistance = lastLocation.distanceFromLocation(lastLocation) 
      traveledDistance += lastDistance 
      print("\(startLocation)") 
      print("\(lastLocation)") 
      print("FULL DISTANCE: \(traveledDistance)") 
      print("STRAIGHT DISTANCE: \(distance)") 
      var travelDistance = setData("distance") 
     } 
    } 
    lastLocation = locations.last 
} 

這是方法

func calculateEmission(numbers: Int...) -> Double{ 
    let recordedDistance = getData("distance") 

    let dis = recordedDistance 
    let emissionAve = 0.16 

    let calculatedEmission : Double = Double(dis) * Double(emissionAve) 

    print(calculatedEmission, "kg Co2") 
    return calculatedEmission 
} 

Answer 1

確保您已經於您的info.plist以下。然後您應該被提示允許訪問位置服務。

<key>NSLocationAlwaysUsageDescription</key> 
<string>Needs access to access GPS</string> 
<key>NSLocationUsageDescription</key> 
<string>Needs access to access GPS</string> 
<key>NSLocationWhenInUseUsageDescription</key> 
<string>Needs access to access GPS</string> 

你應該在viewDidLoad中有這樣的東西。

override func viewDidLoad() { 
    self.locationManager.requestWhenInUseAuthorization() 
     if CLLocationManager.locationServicesEnabled() { 
      locationManager.delegate = self 
      locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters 
      locationManager.startUpdatingLocation() 
     } 
    }