使用Swift进行注册后，如何将用户位置存储到Firebase日期库中？

Question

您好，我正在开发一个应用程序，它将显示正在使用该应用程序的当前用户所在位置50英里内的现有用户。

我已经有基本的注册页面工作，可以在Fire数据库中存储用户名和电子邮件，但是我的问题是如何获取要注册的用户的当前位置以保存在Firebase数据库中？

这是我的注册页面代码：

import Foundation
import UIKit
import Firebase
import GeoFire

class SignUpViewController:UIViewController, UITextFieldDelegate {

    @IBOutlet weak var usernameField: UITextField!
    @IBOutlet weak var emailField: UITextField!
    @IBOutlet weak var passwordField: UITextField!
    @IBOutlet weak var dismissButton: UIButton!
    @IBOutlet weak var profileImageView: UIImageView!
    @IBOutlet weak var tapToChangeProfileButton: UIButton!

    var continueButton:RoundedWhiteButton!
    var activityView:UIActivityIndicatorView!

    var imagePicker:UIImagePickerController!

    override func viewDidLoad() {
        super.viewDidLoad()

        view.addVerticalGradientLayer(topColor: primaryColor, bottomColor: secondaryColor)

        continueButton = RoundedWhiteButton(frame: CGRect(x: 0, y: 0, width: 200, height: 50))
        continueButton.setTitleColor(secondaryColor, for: .normal)
        continueButton.setTitle("Continue", for: .normal)
        continueButton.titleLabel?.font = UIFont.systemFont(ofSize: 18.0, weight: UIFont.Weight.bold)
        continueButton.center = CGPoint(x: view.center.x, y: view.frame.height - continueButton.frame.height - 24)
        continueButton.highlightedColor = UIColor(white: 1.0, alpha: 1.0)
        continueButton.defaultColor = UIColor.white
        continueButton.addTarget(self, action: #selector(handleSignUp), for: .touchUpInside)

        view.addSubview(continueButton)
        setContinueButton(enabled: false)

        activityView = UIActivityIndicatorView(activityIndicatorStyle: .gray)
        activityView.color = secondaryColor
        activityView.frame = CGRect(x: 0, y: 0, width: 50.0, height: 50.0)
        activityView.center = continueButton.center

        view.addSubview(activityView)

        usernameField.delegate = self
        emailField.delegate = self
        passwordField.delegate = self

        usernameField.addTarget(self, action: #selector(textFieldChanged), for: .editingChanged)
        emailField.addTarget(self, action: #selector(textFieldChanged), for: .editingChanged)
        passwordField.addTarget(self, action: #selector(textFieldChanged), for: .editingChanged)


        let imageTap = UITapGestureRecognizer(target: self, action: #selector(openImagePicker))
        profileImageView.isUserInteractionEnabled = true
        profileImageView.addGestureRecognizer(imageTap)
        profileImageView.layer.cornerRadius = profileImageView.bounds.height / 2
        profileImageView.clipsToBounds = true
        //tapToChangeProfileButton.addTarget(self, action: #selector(openImagePicker), for: .touchUpInside)

        imagePicker = UIImagePickerController()
        imagePicker.allowsEditing = true
        imagePicker.sourceType = .photoLibrary
        imagePicker.delegate = self






    }



    @objc func openImagePicker(_ sender:Any) {
        // Open Image Picker
        self.present(imagePicker, animated: true, completion: nil)
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        usernameField.becomeFirstResponder()
        NotificationCenter.default.addObserver(self, selector:#selector(keyboardWillAppear), name: NSNotification.Name.UIKeyboardWillShow, object: nil)

    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        usernameField.resignFirstResponder()
        emailField.resignFirstResponder()
        passwordField.resignFirstResponder()

        NotificationCenter.default.removeObserver(self)
    }

    override var preferredStatusBarStyle: UIStatusBarStyle {
        get {
            return .lightContent
        }
    }

    @IBAction func handleDismissButton(_ sender: Any) {
        self.dismiss(animated: false, completion: nil)
    }

    /**
     Adjusts the center of the **continueButton** above the keyboard.
     - Parameter notification: Contains the keyboardFrame info.
     */

    @objc func keyboardWillAppear(notification: NSNotification){

        let info = notification.userInfo!
        let keyboardFrame: CGRect = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue

        continueButton.center = CGPoint(x: view.center.x,
                                        y: view.frame.height - keyboardFrame.height - 16.0 - continueButton.frame.height / 2)
        activityView.center = continueButton.center
    }

    /**
     Enables the continue button if the **username**, **email**, and **password** fields are all non-empty.

     - Parameter target: The targeted **UITextField**.
     */

    @objc func textFieldChanged(_ target:UITextField) {
        let username = usernameField.text
        let email = emailField.text
        let password = passwordField.text
        let formFilled = username != nil && username != "" && email != nil && email != "" && password != nil && password != ""
        setContinueButton(enabled: formFilled)
    }



    func textFieldShouldReturn(_ textField: UITextField) -> Bool {

         // Resigns the target textField and assigns the next textField in the form.

        switch textField {
        case usernameField:
            usernameField.resignFirstResponder()
            emailField.becomeFirstResponder()
            break
        case emailField:
            emailField.resignFirstResponder()
            passwordField.becomeFirstResponder()
            break
        case passwordField:
            handleSignUp()
            break
        default:
            break
        }
        return true
    }

    /**
     Enables or Disables the **continueButton**.
     */

    func setContinueButton(enabled:Bool) {
        if enabled {
            continueButton.alpha = 1.0
            continueButton.isEnabled = true
        } else {
            continueButton.alpha = 0.5
            continueButton.isEnabled = false
        }
    }

    @objc func handleSignUp() {
        guard let username = usernameField.text else { return }
        guard let email = emailField.text else { return }
        guard let pass = passwordField.text else { return }
        guard let image = profileImageView.image else { return }




        setContinueButton(enabled: false)
        continueButton.setTitle("", for: .normal)
        activityView.startAnimating()

        Auth.auth().createUser(withEmail: email, password: pass) { user, error in
            if error == nil && user != nil {
                print("User created!")



                // 1. Upload the profile image to Firebase Storage

                self.uploadProfileImage(image) { url in

                    if url != nil {
                        let changeRequest = Auth.auth().currentUser?.createProfileChangeRequest()
                        changeRequest?.displayName = username
                        changeRequest?.photoURL = url

                        changeRequest?.commitChanges { error in
                            if error == nil {
                                print("User display name changed!")

                                self.saveProfile(username: username, profileImageURL: url!) { success in
                                    if success {
                                        self.dismiss(animated: true, completion: nil)
                                    }
                                }

                            } else {
                                print("Error: \(error!.localizedDescription)")
                            }
                        }
                    } else {
                        // Error unable to upload profile image
                    }

                }

            } else {
                print("Error: \(error!.localizedDescription)")
            }
        }
    }


    func uploadProfileImage(_ image:UIImage, completion: @escaping ((_ url:URL?)->())) {
        guard let uid = Auth.auth().currentUser?.uid else { return }
        let storageRef = Storage.storage().reference().child("user/\(uid)")

        guard let imageData = UIImageJPEGRepresentation(image, 0.75) else { return }


        let metaData = StorageMetadata()
        metaData.contentType = "image/jpg"

        storageRef.putData(imageData, metadata: metaData) { metaData, error in
            if error == nil, metaData != nil {
                if let url = metaData?.downloadURL() {
                    completion(url)
                } else {
                    completion(nil)
                }
                // success!
            } else {
                // failed
                completion(nil)
            }
        }
    }

    func saveProfile(username:String, profileImageURL:URL, completion: @escaping ((_ success:Bool)->())) {
        guard let uid = Auth.auth().currentUser?.uid else { return }
        let databaseRef = Database.database().reference().child("users/profile/\(uid)")

        let userObject = [
            "username": username,
            "photoURL": profileImageURL.absoluteString
        ] as [String:Any]

        databaseRef.setValue(userObject) { error, ref in
            completion(error == nil)
        }
    }





}

extension SignUpViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        picker.dismiss(animated: true, completion: nil)
    }

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

        if let pickedImage = info[UIImagePickerControllerEditedImage] as? UIImage {
            self.profileImageView.image = pickedImage
        }

        picker.dismiss(animated: true, completion: nil)
    }






}

我真的是新手，所以任何帮助都会很棒！

预先感谢：）

Answer 1

首先，您需要在用户使用应用程序时要求获得用户位置的授权。

您需要添加键“隐私-使用中的位置使用情况说明”，还需要在其旁边输入一个值。

// MARK: Location Delegate Methods
extension ViewController: CLLocationManagerDelegate {
  func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
      if let location = locations.last {
          let userLatitude = location.coordinate.latitude
          let userLongitude = location.coordinate.longitude

          //Send these latitude and longitude values to your firebase,
          //so you will have the user's location.

      }
  }
}

您可以在扩展中看到，我使我的VC符合CLLocationManagerDelegate，并通过didUpdateLocations方法，我可以获取上次更新方法的坐标，也可以这样做，并将这些坐标保存在Firebase中。

您还可以在此之前检查授权，也许您可​​以显示警报或以需要授权的方式让用户知道：

let authStat = CLLocationManager.authorizationStatus()

    if authStat == .denied || authStat == .restricted || authStat == .notDetermined {
        showAlert(title: "Location Services Disabled", message: "Please enable Location Services in Settings to locate yourself!")
    } else {
        //do your firebase things.
    }