How to pass value form view to view model in SwiftUI? - ios

Question

I am having one email filed in view, that value I want to pass to viewModel. But I am not sure how.
Email View
import SwiftUI
struct EmailView: View {
#State private var email: String = ""
init(viewModel:EmailViewModel) {
self.viewModel = viewModel
}
TextField("", text: $email)
func sendButtonAction() {
viewModel.updateDataToServer()
}
}
Email Viewmodel
import Foundation
import SwiftUI
class EmailViewModel: NSObject, ObservableObject {
var emailText = ""
convenience init(emailText: String) {
self.init()
self.emailText = emailText
}
func updateDataToServer() {
print("Show email text" + emailText). // not getting email value here???
}
}
I am coming to email screen from other screen. How should I pass email value form here?
NavigationLink(destination: EmailView(viewModel: EmailViewModel(emailText: "")), isActive: $pushToMail) {
EmptyView()
}.hidden()

Answer 1

Try this type of approach as shown in the example code:
import SwiftUI
#main
struct TestApp: App {
var body: some Scene {
WindowGroup {
ContentView()
}
}
}
struct ContentView: View {
#StateObject var emailModel = EmailViewModel()
var body: some View {
NavigationView {
VStack (spacing: 55) {
NavigationLink(destination: EmailView(viewModel: emailModel)) {
Text("go to EmailView")
}
Text("email was: \(emailModel.emailText)")
}
}.navigationViewStyle(.stack)
}
}
class EmailViewModel: ObservableObject {
#Published var emailText = ""
func updateDataToServer() {
print("----> Show email text " + emailText)
}
}
struct EmailView: View {
#ObservedObject var viewModel: EmailViewModel
var body: some View {
TextField("Enter your email", text: $viewModel.emailText).border(.green)
.onSubmit {
viewModel.updateDataToServer()
}
}
}