How to hide Keyboard in SwiftUI?

KodeHideKeyboard.swift

private enum Field: Int, CaseIterable {
    case username, password
}

@State private var username: String = ""
@State private var password: String = ""

@FocusState private var focusedField: Field?

var body: some View {
    NavigationView {
        Form {
            TextField("Username", text: $username)
                .focused($focusedField, equals: .username)
            SecureField("Password", text: $password)
                .focused($focusedField, equals: .password)
        }
        .toolbar {
            ToolbarItem(placement: .keyboard) {
                Button("Done") {
                    focusedField = nil
                }
            }
        }
    }
}