我不知道如何在视图文件的ObservableObject类中绑定Publisher。
用户

struct User: Identifiable,Decodable{
    var id: String?
    var email: String
    var username: String
    
}

视图模型

class UserProfileViewModel: ObservableObject{
   @Published var user: User?

   //fetch data and bind the user property
}

用户配置文件

struct UserProfile: View {  
    @ObservedObject private var userProfileVM = UserProfileViewModel()
     var body: some View {
        VStack{
       UserForm(name: Binding($userProfileVM.user.username)!, 
               email: Binding($userProfileVM.user.email)!
            )               }
     }
}

用户表单

struct UserForm: View {
    @Binding var name: String
    @Binding var email: String
    
    var body: some View {
        TextField("name", text: $name)
                    .keyboardType(.namePhonePad)
        TextField("email", text: $email)
    }
}

我不知道如何在UserForm上绑定UserProfile中的userProfileVM.user.username和userProfileVM.user.email，现在我在UserProfile中得到错误Value of optional type 'User?' must be unwrapped to refer to member 'email' of wrapped base type 'User' & Chain the optional using '?' to access member 'email' only for non-'nil' base values。
请告诉我如何解决。