FireStore #firebase

firestore.swift

// App Deleagate
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool 	{
        FirebaseApp.configure()
        _ = Firestore.firestore()
        return true
    }


// Controller
// Init Firestore
let db = Firestore.firestore()


// Write a document
        if let messageBody = messageTextfield.text,
           let messageSender = Auth.auth().currentUser?.email {
            db.collection(K.FStore.collectionName).addDocument(data: [
                K.FStore.senderField: messageSender,
                K.FStore.bodyField: messageBody
            ]) { (error) in
                if let err = error {
                    print("There was an issue saving data to Firestore: \(err)")
                } else {
                    print("Successfully saved data")
                }
            }
        }
        
// Reading a document
    func loadMessages() {
        messages = []
        
        db.collection(K.FStore.collectionName).getDocuments { (querySnapshot, error) in
            if let err = error {
                print("There was an issue retrieving from Firestore \(err)")
            } else {
                if let snap = querySnapshot {
                    for document in snap.documents {
                        let data = document.data()
                        
                        if let messageSender = data[K.FStore.senderField] as? String,
                           let body = data[K.FStore.bodyField] as? String {
                            let newMessage = ChatMessage(sender: messageSender, body: body)
                            self.messages.append(newMessage)
                        }
                    }
                    
                    DispatchQueue.main.async {
                        self.tableView.reloadData()
                    }
                }
                
            }
        }
    }