Swift - 根据从Firebase DB获取的数据的最近位置排序DB

我试图从我的firebase后端检索数据 - 每个条目都有一个用户名，lat和long。从查看其他stackoverflow问题，我发现CoreLocation应该按照距离我们尝试使用的距离（或者距离（从:) :)方法进行排序。它似乎没有按预期工作。我想知道我做错了什么。Swift - 根据从Firebase DB获取的数据的最近位置排序DB

import UIKit 
import Firebase 
import FirebaseDatabase 
import MapKit 
import CoreLocation 

class RequestVC: UITableViewController, CLLocationManagerDelegate { 

    var locationManager = CLLocationManager() 
    var sellerUserNames = [String]() 
    var requestLocations = [CLLocationCoordinate2D]() 

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
     if segue.identifier == "backToMain" { 
      self.navigationController?.navigationBar.isHidden = true 
     } 
    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     locationManager.delegate = self 
     locationManager.desiredAccuracy = kCLLocationAccuracyBest 
     locationManager.requestWhenInUseAuthorization() 
     locationManager.startUpdatingLocation() 

     let databaseRef = FIRDatabase.database().reference() 
     databaseRef.child("Sell_Request").observe(FIRDataEventType.childAdded, with: { (FIRDataSnapshot) in 

      if let data = FIRDataSnapshot.value as? NSDictionary { 
       if let name = data[Constants.NAME] as? String { 
        if let lat = data["latitude"] as? Double { 
         if let long = data["longitude"] as? Double { 

          print("\(self.sellerUserNames) Location: Latitude: \(lat), Longitude: \(long)") 

          self.sellerUserNames.append(name) 
          self.requestLocations.append(CLLocationCoordinate2D(latitude: lat, longitude: long)) 

          self.tableView.reloadData() 

         } 
        } 
       } 
      } 
     }) 
    } 

    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { 
     } 

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

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


    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { 

     let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) 
     let location = locationManager.location?.coordinate 

     let buyerLocation = CLLocation(latitude: (location?.latitude)!, longitude: (location?.longitude)!) 
     let sellerLocation = CLLocation(latitude: requestLocations[indexPath.row].latitude, longitude: requestLocations[indexPath.row].longitude) 

     let distance = buyerLocation.distance(from: sellerLocation)/1000 

     let roundedDistance = round(distance * 100)/100 

     let distanceInMiles = roundedDistance * 0.621 
     let roundedDistanceInMiles = round(distanceInMiles * 1000)/1000 


     cell.textLabel?.text = sellerUserNames[indexPath.row] + " - \(roundedDistanceInMiles) miles away" 

     return cell 
    } 
}

来源

2017-02-24 user2411290

您可以将代码修剪到[MWE]（http://stackoverflow.com/help/mcve）吗？您无需展示Firebase的任何问题。只需显示坐标列表以及希望它们在tableview中显示的顺序。 –

修剪了一下，抱歉。 – user2411290

-1

您可以尝试做GeoFire工作。它不适用于椰子树，尽管有解决方法。

来源

2017-02-24 22:21:48 Josh

Swift - 根据从Firebase DB获取的数据的最近位置排序DB

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