ios - 为什么第一个 EditText 视图不能正常工作，但它下面的视图却可以？

Question

如果用户在第一个 EditText 中输入文本，然后单击返回，它将清除所有文本。但是，如果用户在第二个 EditText 中输入文本并单击返回，则不会发生任何事情。第一个 EditText 也不会正确显示文本颜色，它将文本颜色显示为黑色，而其余的则正确显示为白色。

注册屏幕

struct SignUpScreen: View {

    @State
    var firstName: String = ""
    @State
    var lastName: String = ""
    @State
    var birthday: String = ""
    @State
    var number: String = ""
    @State
    var email: String = ""
    @State
    var password: String = ""
    @State
    var confirmPassword: String = ""

    @ObservedObject
    var viewModel: SignUpViewModel = SignUpViewModel()


    var body: some View {
        ZStack {
            VStack {
                VClearBackground()
                Spacer()
            }
            ScrollView {
                VStack(alignment: .leading) {
                    Group {
                        PreHeaderText(header: "Get Started")
                            .alignmentGuide(.leading, computeValue: {d in
                                d[.leading]
                            })
                            .padding(EdgeInsets.init(top: 32, leading: 0, bottom: 0, trailing: 0))
                        HeaderText(header: "Create Account")
                        EditText(hint: "John", text: $viewModel.firstName, label: "FIRST NAME", textContentType: UITextContentType.name)
                        EditText(hint: "Doe", text: $lastName, label: "LAST NAME", textContentType: UITextContentType.name)
                        EditText(hint: "01/01/2001", text: $birthday, label: "BIRTHDAY")
                        EditText(hint: "[phone])", text: $number, label: "MOBILE NUMBER", textContentType: UITextContentType.telephoneNumber, keyboardType: UIKeyboardType.phonePad)
                        EditText(hint: "[e-mail]", text: $email, label: "EMAIL", textContentType: UITextContentType.emailAddress)
                        EditText(hint: "********", text: $password, label: "PASSWORD", textContentType: UITextContentType.newPassword)
                        EditText(hint: "********", text: $confirmPassword, label: "CONFIRM PASSWORD", textContentType: UITextContentType.newPassword)
                    }
                    Group {
                        if self.viewModel.error != nil {
                            HStack {
                                Spacer()
                                Text(viewModel.error ?? "")
                                    .foregroundColor(ColorTheme.error.color)
                                Spacer()
                            }
                            .padding()
                        }
                        HStack {
                            Spacer()
                            VowerButton(text: "Submit") {
                                self.viewModel.signUp(firstName: self.viewModel.firstName, lastName: self.lastName, email: self.email, birthday: self.birthday, phoneNumber: self.number, password: self.password, confirmPassword: self.confirmPassword)
                            }
                            Spacer()
                        }
                        .padding()

                        HStack {
                            Spacer()
                            NavigationLink(destination: LoginScreen(), isActive: $viewModel.goToLogin) {
                                CtaText(text: "Have an account?", cta: "Login") {
                                    self.viewModel.onGoToLoginClicked()
                                }
                            }
                            .padding()
                            Spacer()
                        }

                        Spacer()
                    }
                }
            }
            .padding(EdgeInsets.init(top: 16, leading: 16, bottom: 16, trailing: 16))
            .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .leading)
        }
        .background(LinearGradient(gradient: Gradient(colors: [.black, ColorTheme.brandPurple.color]), startPoint: .top, endPoint: .bottom))
        .edgesIgnoringSafeArea(.all)
    }
}

编辑文本

struct EditText: View {

    var hint: String
    @Binding
    var text: String
    var label: String = ""
    var defaultValue =  ""
    var textContentType: UITextContentType? = .none
    var keyboardType: UIKeyboardType = .default

    private func initializeDefaultValue() {
        DispatchQueue.main.async {
            self.text = self.defaultValue
        }
    }

    var body: some View {
        initializeDefaultValue()
        return VStack(alignment: .leading) {
            Text(label).font(.system(size: 12)).bold()
                .foregroundColor(ColorTheme.text.color)
            HStack {
                TextField(hint, text: $text)
                .lineLimit(1)
                .textContentType(textContentType)
                .keyboardType(keyboardType)
                    .foregroundColor(ColorTheme.text.color)
            }
            Divider().background(Color(ColorTheme.brandBlue.value))
        }
        .padding(EdgeInsets.init(top: 12, leading: 0, bottom: 8, trailing: 0))
    }
}

标签： iosswiftswiftui

Answer 1

这里是

EditText(hint: "John", text: $viewModel.firstName, label: "FIRST NAME", textContentType: UITextContentType.name)
EditText(hint: "Doe", text: $lastName, label: "LAST NAME", textContentType: UITextContentType.name)

如您所见，第一个文本字段绑定到视图模型（未提供，所以我不能说那里出了什么问题），但第二个文本字段绑定到内部视图状态。

正如我所看到的firstName内部视图状态，所以可能的意图是（和实际修复）只是使用它

EditText(hint: "John", text: $firstName, label: "FIRST NAME", textContentType: UITextContentType.name)