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?我只是不确定要更改 distanceLabel.text 中的哪些内容以使每个地标的数字更改。谢谢你!
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))!
}
}