如何在Swift 4中使用Google API计算两个位置之间的距离

Question

我当前正在研究一个iOS项目，在该项目中我必须在两个位置之间计算距离。我已经没有使用Google完成了，但是我想使用Google API获得准确的距离，我在这里共享我的代码

    let myLocation = CLLocation(latitude: CLLocationDegrees(latittude[indexPath.row])!, longitude: CLLocationDegrees(longittude[indexPath.row])!)
        let lat = UserDefaults.standard.string(forKey: "lat") ?? ""
        let long = UserDefaults.standard.string(forKey: "long") ?? ""
        let myBuddysLocation = CLLocation(latitude: CLLocationDegrees(lat)!, longitude: CLLocationDegrees(long)!)

Answer 1

使用距离 CoreLocation Framework的功能，

 var startLocation = CLLocation(latitude: startLatitude, longitude: startLongitude)
 var endLocation = CLLocation(latitude: endLatitude, longitude: endLongitude)
 var distance: CLLocationDistance = startLocation.distance(from: endLocation)

Answer 2

swift 5 ：
据我所知，有两种方法可以找到距离。如果您正在寻找开车距离，则可以随时使用MKDirections。这是寻找开车距离的代码（您还可以找到步行距离，并通过更改运输类型的过境距离）。

let sourceP = CLLocationCoordinate2DMake( sourceLat, sourceLong)
let destP = CLLocationCoordinate2DMake( desLat, desLong)
let source = MKPlacemark(coordinate: sourceP)
let destination = MKPlacemark(coordinate: destP)
        
let request = MKDirections.Request()
request.source = MKMapItem(placemark: source)
request.destination = MKMapItem(placemark: destination)
// Specify the transportation type
request.transportType = MKDirectionsTransportType.automobile;
// If you want only the shortest route, set this to a false
request.requestsAlternateRoutes = true
let directions = MKDirections(request: request)
 // Now we have the routes, we can calculate the distance using
 directions.calculate { (response, error) in
    if let response = response, let route = response.routes.first {
                print(route.distance) //This will return distance in meters
    }
 }

如果您仅在寻找空气距离/鸟类的眼睛距离/坐标距离，则可以使用此代码：

let sourceP = CLLocation(latitude: sourceLat, longitude: sourceLong)
let desP = CLLocation(latitude: desLat, longitude: desLong))
let distanceInMeter = sourceP.distance(from: desP)