Question

有人可以帮我理解我需要添加什么来获取用户位置和地标之间的距离吗？我只是不确定在distanceLabel.text中要更改什么来使数字更改为每个地标。谢谢！

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有一个distanceFromLocation方法，因此给出了两个CLLocations：

CLLocationDistance distanceInMeters = [location1 distanceFromLocation:location2];

或在Swift 3中：

//：游乐场 - 名词：人们可以玩的地方

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

你到这里的距离是1英里= 1609米

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

Swift MKMapItems与用户位置的距离

1 个答案: