swift - 使用CoreLocation2d

我试图得到从我的当前位置到某个位置的距离，但它没有打印位置。我不确定我是否把它用在分机上。

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.


        var location = CLLocationCoordinate2D.distanceInMetersFrom(CLLocationCoordinate2D(latitude: 10.30, longitude: 44.34))

        print("distance = \(location)")
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

extension CLLocationCoordinate2D {

    func distanceInMetersFrom(otherCoord : CLLocationCoordinate2D) -> CLLocationDistance {
        let firstLoc = CLLocation(latitude: self.latitude, longitude: self.longitude)
        let secondLoc = CLLocation(latitude: otherCoord.latitude, longitude: otherCoord.longitude)
        return firstLoc.distanceFromLocation(secondLoc)
    }

}

输出如下：

distance = (Function)

最佳答案

您的扩展适合于CLLocationCoordinate2D的实例。
要使其工作，您需要在实例中调用它，因此：
更改：

var location = CLLocationCoordinate2D.distanceInMetersFrom(CLLocationCoordinate2D(latitude: 10.30, longitude: 44.34))

对于

var location = CLLocationCoordinate2D().distanceInMetersFrom(CLLocationCoordinate2D(latitude: 10.30, longitude: 44.34))

注意CLLocationCoordinate2D后面的括号。
如果您想保持这一行的原样，那么扩展中的更改将如下所示：

static func distanceInMetersFrom(otherCoord : CLLocationCoordinate2D) -> CLLocationDistance {
            let here = CLLocationCoordinate2D()
            let firstLoc = CLLocation(latitude: here.latitude, longitude: here.longitude)
            let secondLoc = CLLocation(latitude: otherCoord.latitude, longitude: otherCoord.longitude)
            return firstLoc.distanceFromLocation(secondLoc)
        }

关于swift - 使用CoreLocation2d，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/35299953/