有人可以帮我了解我需要添加什么才能获得用户位置和地标之间的距离吗?我只是不确定在距离标签文本中更改什么以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))!
}
}
> CLLocation 有一个 distanceFromLocation 方法,因此给定两个 CLLocation:
CLLocationDistance distanceInMeters = [location1 distanceFromLocation:location2];
或在 Swift 3 中:
//: 游乐场 - 名词:人们可以玩耍的地方
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
你在这里得到的距离以米为单位,所以 1 英里 = 1609 米
if(distanceInMeters <= 1609)
{
// under 1 mile
}
else
{
// out of 1 mile
}