Finding distance between CLLocationCoordinate2D points

问题

I know from documentation we can find distance between two CLLocation points using the function, distanceFromLocation:. But my problem is I dont have CLLocation data type with me, I have the CLLocationCoordinate2D points. So how can I find distance between two CLLocationCoordinate2D points. I have seen the post post but not helpful for me.

回答1:

You should create an object of CLLocation using,

- (id)initWithLatitude:(CLLocationDegrees)latitude
    longitude:(CLLocationDegrees)longitude;

Then, you should be able to calculate the distance using

[location1 distanceFromLocation:location2];

回答2:

If it is ok for you to get distance in meters between points, then

CLLocationCoordinate2D coordinate1 = <some value>
CLLocationCoordinate2D coordinate2 = <some value>
…
MKMapPoint point1 = MKMapPointForCoordinate(coordinate1);
MKMapPoint point2 = MKMapPointForCoordinate(coordinate2);
CLLocationDistance distance = MKMetersBetweenMapPoints(point1, point2);

will return the distance between two points. No needs to create CLLocation by given CLLocationCoordinate2D. This defines are available since iOS 4.0

回答3:

Swift 4:

extension CLLocation {

    /// Get distance between two points
    ///
    /// - Parameters:
    ///   - from: first point
    ///   - to: second point
    /// - Returns: the distance in meters
    class func distance(from: CLLocationCoordinate2D, to: CLLocationCoordinate2D) -> CLLocationDistance {
        let from = CLLocation(latitude: from.latitude, longitude: from.longitude)
        let to = CLLocation(latitude: to.latitude, longitude: to.longitude)
        return from.distance(to)
    }
}

回答4:

Swift4: combined above thoughts

extension CLLocationCoordinate2D {
    //distance in meters, as explained in CLLoactionDistance definition
    func distance(from: CLLocationCoordinate2D) -> CLLocationDistance {
        let destination=CLLocation(latitude:from.latitude,longitude:from.longitude)
        return CLLocation(latitude: latitude, longitude: longitude).distance(from: destination)
    }
}

回答5:

    let point1 = MKMapPointForCoordinate(myLocation)
    let point2 = MKMapPointForCoordinate(friendLocation)
    let distance = MKMetersBetweenMapPoints(point1, point2)/1000
    let distanceStr = NSString(format: "%.3f", distance)

Simple version of Valleri's answer. Divide by 1000 to get KM followed by conversion to string.

回答6:

CLLocationDistance is a measurement in meters.

let point1 = CLLocationCoordinate2D(latitude: lat1, longitude: lon1)
let point2 = CLLocationCoordinate2D(latitude: lat2, longitude: lon2)
let distance = point1.distance(to: point2)

来源：https://stackoverflow.com/questions/11077425/finding-distance-between-cllocationcoordinate2d-points

标签

ios

iphone

core-location