ios - 在注释上显示从当​​前位置到另一点的距离

Question

我想显示从当前位置到另一点的总距离，并且我希望在 Annotation 的副标题中显示距离。 这是我的代码，但它不起作用:

func shopDeal () {
    var inKm = ""
    let locationsq =
        [["title": "Shop Deal","subtitle": "\(inKm) km", "latitude": 31.352792, "longitude": 74.253201],
        ["title": "Shop Deal", "subtitle": "\(inKm) km", "latitude": 31.403563, "longitude":  74.258200]]

    // Span
    for location in locationsq {
        let annotation = MKPointAnnotation()
        annotation.title = location["title"] as? String
        annotation.subtitle = location["subtitle"] as? String
        annotation.coordinate = CLLocationCoordinate2D(latitude: location["latitude"] as! Double, longitude: location["longitude"] as! Double)
        mapView.addAnnotation(annotation)
        func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {

            let myCurrentLoc = locations[locations.count - 1]
            let coor1 = CLLocation(latitude: annotation.coordinate.latitude, longitude: annotation.coordinate.longitude)
            let coor2 = CLLocation (latitude: myCurrentLoc.coordinate.latitude, longitude: myCurrentLoc.coordinate.longitude )

            let distanceInMeters:CLLocationDistance = coor1.distanceFromLocation(coor2)

            inKm = String(format: "%.2f", distanceInMeters / 1000)

            print("\(inKm) km")
        }
    }
    mapView.delegate = self
}

非常感谢任何帮助。提前致谢

Answer 1

在 map 上查找两点(LAT 和 LONG)之间的距离:

let coordinate1 = CLLocation(latitude: 5.0, longitude: 5.0)
let coordinate2 = CLLocation(latitude: 5.0, longitude: 3.0)
//Decalare distanceInMeters as global variables so that you can show distance on subtitles
let distanceInMeters = coordinate1.distance(from: coordinate2)

现在如果你想在注释的副标题中显示距离，那么:

func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? {

    if annotation is MKUserLocation {
            return nil
    }

    let reuseId = "pinIdentifier"

    var pinView = mapView.dequeueReusableAnnotationViewWithIdentifier(reuseId) as? MKPinAnnotationView
    if pinView == nil {
        pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: reuseId)
        pinView!.canShowCallout = true
    }
    else {
        pinView!.annotation = annotation
    }

    //Adding Subtitle text
    let subtitleView = UILabel()
    //Decalare distanceInMeters as global variables so that you can show distance on subtitles
    subtitleView.text = "\(distanceInMeters)"
    pinView!.detailCalloutAccessoryView = subtitleView

    return pinView
}

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