如何將值表單視圖傳遞給SwiftUI中的視圖模型？-有解無憂

我正在查看一封電子郵件，我想將該值傳遞給 viewModel。但我不確定如何。

電子郵件視圖

import SwiftUI
    
struct EmailView: View {
    
    @State private var email: String = ""

    init(viewModel:EmailViewModel) {
        self.viewModel = viewModel
    }
    TextField("", text: $email)
    func sendButtonAction() {
        viewModel.updateDataToServer()
    }
 }

電子郵件視圖模型

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???
    }
}

我從其他螢屏來到電子郵件螢屏。我應該如何在此處傳遞電子郵件值表單？

NavigationLink(destination: EmailView(viewModel: EmailViewModel(emailText: "")), isActive: $pushToMail) {
    EmptyView()
}.hidden()

uj5u.com熱心網友回復：

嘗試這種方法，如示例代碼所示：

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()
            }
    }
}

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標籤：ios 迅速迅捷

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