Swift MKMapItems距用戶的距離位置

Question

有人可以幫助我瞭解我需要添加哪些內容以獲取用戶位置和地標之間的距離嗎？我只是不確定要在distanceLabel.text中更改哪些內容才能將數字更改爲每個地標。謝謝！

import UIKit 
import MapKit 

class ListedMapTableViewController: UITableViewController, CLLocationManagerDelegate { 

var mapItems: [MKMapItem]! 
var userLocation = CLLocationManager() 
let distanceFormatter = MKDistanceFormatter() 


override func numberOfSections(in tableView: UITableView) -> Int { 
    return 1 
} 

override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
    return mapItems.count 
} 

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 
    let cell = tableView.dequeueReusableCell(withIdentifier: "resultCell", for: indexPath) as! ListedTableViewCell 

    // Configure the cell... 
    let row = indexPath.row 
    let item = mapItems[row] 
    cell.nameLabel.text = item.name 
    cell.detailLabel.text = item.phoneNumber 
    let distanceInMeters : Double = self.userLocation.location!.distance(from: mapItems[row].placemark.location!) 
    let distanceInMiles : Double = ((distanceInMeters.description as String).doubleValue * 0.00062137) 
    cell.distanceLabel.text = "\(distanceInMiles.string(2)) miles away" 

    return cell 
} 

} 


extension String { 
var doubleValue: Double { 
    return (self as NSString).doubleValue 
} 
} 

//formats a double's decimal places 
extension Double { 
func string(_ fractionDigits:Int) -> String { 
    let formatter = NumberFormatter() 
    formatter.minimumFractionDigits = fractionDigits 
    formatter.maximumFractionDigits = fractionDigits 
    return formatter.string(from: NSNumber(value: fractionDigits))! 
} 
} 

Answer 1

CLLocation有一個distanceFromLocation方法，從而給出了兩個CLLocations：

CLLocationDistance distanceInMeters = [location1 distanceFromLocation:location2]; 

或斯威夫特3：

//：遊樂場 - 名詞：一個地方，人們可以玩

import CoreLocation 


let coordinate₀ = CLLocation(latitude: 5.0, longitude: 5.0) 
let coordinate₁ = CLLocation(latitude: 5.0, longitude: 3.0) 

let distanceInMeters = coordinate₀.distance(from: coordinate₁) // result is in meters 

你在這裏得到的距離，所以1英里= 1609米

if(distanceInMeters <= 1609) 
{ 
// under 1 mile 
} 
else 
{ 
// out of 1 mile 
}