计算总距离swift iOS

Question

因此，在我目前的project 中，我正在做一种计算与普通汽车相比驾驶轻便摩托车时节省的排放量的方法。该函数包含两部分，method（计算）和tracker function。主要问题是跟踪器功能以某种方式似乎根本不跟踪。

我的主要问题是，如何让跟踪器功能在应用打开时始终跟踪？

这是追踪功能

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
}

这就是方法

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

确保您的 info.plist 中有以下内容。然后你应该得到提示允许访问位置服务。

<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>

你应该在 viewDidLoad 中有这样的东西。

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