如何计算在
Swift中使用CoreLocation的总行进距离
到目前为止,我还没有找到任何有关如何在Swift for iOS 8中执行此操作的资源,
您如何计算自开始追踪您的位置以来移动的总距离？
从我到目前为止所读到的,我需要保存点的位置,然后计算当前点和最后一点之间的距离,然后将该距离添加到totalDistance变量
Objective-C对我来说是非常陌生的,所以我无法解决swift语法问题
这是我到目前为止所做的,不确定我是否做得对.虽然distanceFromLocation方法返回所有0.0所以显然有些错误
func locationManager(manager: CLLocationManager!,didUpdateLocations locations: [AnyObject]!) {
var newLocation: CLLocation = locations[0] as CLLocation
oldLocationArray.append(newLocation)
var totalDistance = CLLocationDistance()
var oldLocation = oldLocationArray.last
var distanceTraveled = newLocation.distanceFromLocation(oldLocation)
totalDistance += distanceTraveled
println(distanceTraveled)
}
解决方法
更新：Xcode 8.3.2•Swift 3.1
问题在于因为你总是一遍又一遍地获得相同的位置.试试这样：
import UIKit
import MapKit
class ViewController: UIViewController,CLLocationManagerDelegate {
@IBOutlet weak var mapView: MKMapView!
let locationManager = CLLocationManager()
var startLocation: CLLocation!
var lastLocation: CLLocation!
var startDate: Date!
var traveledDistance: Double = 0
override func viewDidLoad() {
super.viewDidLoad()
if CLLocationManager.locationServicesEnabled() {
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
locationManager.startMonitoringSignificantLocationChanges()
locationManager.distanceFilter = 10
mapView.showsUserLocation = true
mapView.userTrackingMode = .follow
}
}
func locationManager(_ manager: CLLocationManager,didUpdateLocations locations: [CLLocation]) {
if startDate == nil {
startDate = Date()
} else {
print("elapsedTime:",String(format: "%.0fs",Date().timeIntervalSince(startDate)))
}
if startLocation == nil {
startLocation = locations.first
} else if let location = locations.last {
traveledDistance += lastLocation.distance(from: location)
print("Traveled Distance:",traveledDistance)
print("Straight Distance:",startLocation.distance(from: locations.last!))
}
lastLocation = locations.last
}
func locationManager(_ manager: CLLocationManager,didFailWithError error: Error) {
if (error as? CLError)?.code == .denied {
manager.stopUpdatingLocation()
manager.stopMonitoringSignificantLocationChanges()
}
}
}
