在 Xcode 10 中使用 GeoFire 设置用户位置

Question

我的编码（如您将看到的）和对 Xcode 和 Swift 的熟悉是基本的，但我正在学习......我意识到我的代码嵌套不是最好的，如果有的话。我正在尝试将 GeoFire 集成到我的 Xcode 10 应用程序中。我一直在寻找一个明确的解释，但我仍然没有找到答案。我有一个注册用户的注册表格。最初的 Firebase 设置很简单，我有一个功能齐全的表单，可以在 Firebase 中注册用户。现在我正在尝试添加 GeoFire 以跟踪用户的位置。

我在 YouTube 视频和网站上尝试了很多方法，但都没有奏效。

import UIKit
import Foundation
import CoreLocation
import Firebase
import GeoFire

class SecondViewController: UIViewController {

    //Firebase DB ref
    var refDriver: DatabaseReference!




    @IBOutlet weak var name: UITextField!

    @IBOutlet weak var employeenumber: UITextField!    

    @IBOutlet weak var label: UILabel!


    @IBAction func submit(_ sender: UIButton) {
        addDriver()
    }


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        //configuring firebase and ensures no error is returned
        if(FirebaseApp.app() == nil){
            FirebaseApp.configure()

        }


        //getting a reference to the node driver
        refDriver = Database.database().reference().child("driver");

    }

    func addDriver(){
        //generating a new key inside driver node
        //and also getting the generated key
        let key = refDriver.childByAutoId().key

        //creating driver with the given values
        let driver = ["id":key,
                      "name": name.text! as String,
                        "employeenumber": employeenumber.text! as String
                            ]

        //adding the driver to Firebase
        refDriver.child(key!).setValue(driver)



        //displaying submit message
        label.text = "You are registered."
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

Answer 1

在安装 pod 后尝试导入模块

import GeoFire

**var geoFire: GeoFire?**
var myQuery: GFQuery?

在viewdidLoad()函数中调用setupGeofire()

   override func viewDidLoad() {
       super.viewDidLoad()
       // Do any additional setup after loading the view.
       setupGeoFire()
   }


func setupGeoFire() {

       let geoFireRef = Database.database().reference().child("user_locations")
       let geoFire = GeoFire(firebaseRef: geoFireRef)
       self.geoFire = geoFire

       loadUsersWithin(radius: 100)
   }

在 setupGeoFire 中，我创建了一个 var geoFireRef，这只是您要保存用户位置信息的节点

let geoFireRef = Database.database().reference().child("user_locations")

然后我们通过传入那个节点位置来创建 geoFire 对象，我们的 geoFireRef var

然后只需使用 geoFire 对象随处可访问 ``` self.geoFire = geoFire`` `

如果您想获得特定半径（公里）内的用户，您也可以查看下面的函数

func loadUsersWithin(radius: Double){

        guard let uid = Auth.auth().currentUser?.uid else{return}
        geoFire?.getLocationForKey(uid, withCallback: { (userLocation, err) in

            guard let userLocation = userLocation else{return}
            self.myQuery = self.geoFire?.query(at: userLocation, withRadius: radius)

            self.myQuery?.observe(.keyEntered, with: { (key, location) in

                if key == uid{
                    return
                }
                Database.database().reference().child("users").child(key).observeSingleEvent(of: .value, with: { (snapshot) in

                    guard let userDictionary = snapshot.value as? [String:Any] else{return}
                    let user = User(uid: key, dictionary: userDictionary)
                    self.user = user
                    self.usersArray.append(user)
                    self.nearbyCV.reloadData()
                }, withCancel: { (err) in
                    print(err)
                })
            })
        })

    }
}

这是我的 User.swift 数据模型

import UIKit

class User{

    var name: String
    var userImgUrlString: String
    var age: String
    var uid: String
    var aboutMeText:String

    init(uid: String,dictionary: [String: Any]) {

        self.name = dictionary["username"] as? String ?? ""
        self.userImgUrlString = dictionary["profileImageUrlString"] as? String ?? ""
        self.aboutMeText = dictionary["aboutMe"] as? String ?? ""
        self.uid = uid
        self.age = dictionary["age"] as? String ?? ""
    }
}```
hope this helps yo it was hard to find info for me too when i just started but it gets better