SOLVED: Passing @StateObject into ViewModel

@enrique

Jul '23

Hi everyone!,

I'm dealing with this and I would like to know the best approach and what would be needed to fix the problem that I have at this moment:

I have a View with two @StateObjects, User and ViewModel ObservableObject classes. I want to pass to the ViewModel the User instance in order to move all the logic into the ViewModel. This is what I tried:

struct SignUpView: View {
      @StateObject var newUser = User()
      @StateObject private var viewModel: ViewModel

      init() {
          let viewModel = ViewModel(newUser: newUser)
          _viewModel = StateObject(wrappedValue: viewModel)
      }

}

ViewModel:

extension SignUpView {
    @MainActor class ViewModel: ObservableObject {

        init(newUser: User) {
            self.newUser = newUser
        }

        @Published var newUser: User

    }
}

I'm getting 'self' used before all stored properties are initialized in the line:

let viewModel = ViewModel(newUser: newUser)

How should I handle this?

Thanks!

@delawaremathguy

Jul '23

hi,

this should do it ... just create the user first in the init:

struct SignUpView: View {
      @StateObject private var newUser: User
      @StateObject private var viewModel: ViewModel

      init() {
          let user = User()
          _newUser = StateObject(wrappedValue: user)
          let viewModel = ViewModel(newUser: user)
          _viewModel = StateObject(wrappedValue: viewModel)
      }

}

hope this helps,

DMG

@enrique

Jul '23

Thanks!

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