create a view model for signing up a user to firebase in a social media application in swift

To create a view model for signing up a user to Firebase in a social media application in Swift, follow these steps:

1. First, create a new Xcode project and open the ViewController.swift file.

2. Create a new class called SignupViewModel that extends from NSObject and conforms to the ObservableObject protocol.

   main.swift
   import SwiftUI
   import Firebase
   
   class SignupViewModel: NSObject, ObservableObject {
   }
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3. Add properties for the email, password, and confirmPassword fields, along with a boolean property for whether the signup process is currently in progress or not.

   main.swift
   class SignupViewModel: NSObject, ObservableObject {
   
       @Published var email: String = ""
       @Published var password: String = ""
       @Published var confirmPassword: String = ""
       @Published var isSigningUp: Bool = false
   
   }
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4. Add a function called signup that will perform the actual signup process using Firebase.

   main.swift
   class SignupViewModel: NSObject, ObservableObject {
   
       // ...
   
       func signup() {
           guard !email.isEmpty, !password.isEmpty, !confirmPassword.isEmpty else { return }
   
           if password == confirmPassword {
               isSigningUp = true
   
               Auth.auth().createUser(withEmail: email, password: password) { [weak self] (_, error) in
                   guard let self = self else { return }
   
                   DispatchQueue.main.async {
                       if let error = error {
                           print("Error signing up: \(error.localizedDescription)")
                       } else {
                           print("Signup successful!")
                       }
   
                       self.isSigningUp = false
                   }
               }
           } else {
               print("Passwords don't match.")
           }
       }
   
   }
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5. In your SwiftUI view, you can now bind the view model properties to the appropriate text fields and use the signup function to trigger the signup process.

   main.swift
   struct SignupView: View {
   
       @ObservedObject var viewModel = SignupViewModel()
   
       var body: some View {
           VStack {
               TextField("Email", text: $viewModel.email)
               SecureField("Password", text: $viewModel.password)
               SecureField("Confirm Password", text: $viewModel.confirmPassword)
   
               Button(action: viewModel.signup) {
                   if viewModel.isSigningUp {
                       ProgressView()
                   } else {
                       Text("Sign Up")
                   }
               }
               .disabled(viewModel.isSigningUp)
           }
           .padding()
       }
   }
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