SwiftUI cant get Firebase Firestore instance

user_13569070 0
Viewed 690

I can't seem to connect to my Firestore database. The specific error I am getting is "Failed to get FirebaseApp instance. Please call FirebaseApp.configure() before using Firestore". However, I've already called the configure function. Here is my code for the section I am writing:

let db = Firestore.firestore()

I have also properly configured Firebase in AppDelegate like so

FirebaseApp.configure()

Any help on this at all would be really appreciated, I cant seem to figure out what's going on.

This is the section in reference for context:

import SwiftUI
import Firebase
import FirebaseDatabase
import Foundation

    struct Practioner: Identifiable {
        var id: ObjectIdentifier

        var name: String
        var email: String
        var gender: String
        var provider: String
        var education: String
        var subspeciality: String
        var languages: String //fix this to array
        var indigenous: Bool
        var lgbtq: Bool
        var rural: Bool
    }

    public struct DemographicsView: View {
        @State var genderSel = ""
        @State var providerSel = ""
        @State var educationSel = ""
        @State var subspecialtySel = ""
        @State var languageSel = ""
        @State var indigenousSel = false
        @State var lgbtqSel = false
        @State var ruralSel = false

        @EnvironmentObject var settings: UserSettings
        @EnvironmentObject var session: sessionStore

        var genders = ["Male", "Female", "Other"]

        init(){
            UITableView.appearance().backgroundColor = .clear


         }

    public var body: some View {
        VStack {

            NavigationView {

                Form {

                    Text("Demographics")
                        .font(.largeTitle)
                        .fontWeight(.semibold)
                        .padding(.bottom, 20)

                    Text("Please specify the following details about 
     yourself")
                        .font(.title)
                        .fontWeight(.semibold)
                        .padding(.bottom, 20)

                    Section(){

                        Picker(selection: $genderSel, label: 
    Text("Gender")) {

                            ForEach(0 ..< genders.count){
                                Text(self.genders[$0]).tag($0)
                            }
                        }


                        Picker(selection: $providerSel, label: 
    Text("Provider Type")) {

                            Text("Doctor").tag(1)
                            Text("Nurse").tag(2)
                            Text("Other").tag(3)
                        }

                        Picker(selection: $educationSel, label: 
    Text("Country of education")) {

                            Text("Canada").tag(1)
                            Text("USA").tag(2)
                            Text("Other").tag(3)
                        }

                        Picker(selection: $subspecialtySel, label: 
    Text("Subspecialty")) {

                            Text("OGBYN").tag(1)
                            Text("Family doctor").tag(2)
                            Text("Other").tag(3)
                        }

                        Picker(selection: $languageSel, label: 
    Text("Language(s)")) {

                            Text("English").tag(1)
                            Text("French").tag(2)
                            Text("Malayalam").tag(3)
                        }



                    }

                    Toggle(isOn: $indigenousSel) {
                        Text("Indigenous")
                    }

                    Toggle(isOn: $lgbtqSel) {
                        Text("LGBTQ+ (optional)")
                    }

                    Toggle(isOn: $ruralSel) {
                        Text("Rural")
                    }

                    Section(){

                        Button(action: {

                            let db = Firestore.firestore()



                        }) {
                            LoginButtonView(textField: "Sign up")
                        }.frame(minWidth: 0, maxWidth: .infinity, 
    minHeight: 0,maxHeight: .infinity, alignment: .center)

                    }

                }

            }.navigationBarHidden(true)
            .navigationBarTitle(Text("Home"))
            .edgesIgnoringSafeArea([.top, .bottom])

        }
        }
    }
google-cloud-firestore swiftui firebase swift ios
4 Answers

Add

import FirebaseFirestore

at the top and try building the app again. Worked for me!

Example :

import FirebaseFirestore
import SwiftUI
import Firebase
import FirebaseDatabase
import Foundation
user_78760860

Your declaration let db = Firestore.firestore() should be declared at the top of your Class (ViewModel) and not in a Button. There might be other mistakes, which can't be elaborated with just such little code provided.

user_126374220

There are three steps to initializing and working with Firestore. It's possible one is missing (this shows the steps for Swift, SwiftUI is similar)

1) .configure in AppDelegate

class AppDelegate: UIResponder, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions... {
        FirebaseApp.configure()
        return true
    }

2) Set up a class var within a ViewController (for example)

class ViewController: UIViewController {
    var db: Firestore!

3) Initialize the class var in the ViewController (for example)

override func viewDidLoad() {
    super.viewDidLoad()
    self.db = Firestore.firestore()
user_28519370

In case someone comes across this while trying to run SwiftUI like previews for UIKit code. Or more specifically doing a SwiftUI UIKit integration with UIViewControllerRepresentable...

Call FirebaseApp.configure() again when overriding viewDidLoad in the view controller worked for me (even if its already in your AppDelegate). For example...

class MyController: UIViewController {    
     override func viewDidLoad() {
           super.viewDidLoad()
           FirebaseApp.configure()
           self.db = Firestore.firestore()
        }
}
user_7935370
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