Question 68564 in IOS Swift Question posted in
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How to access property in viewmodel to view in SwiftUI? – Ios swift

I have viewmodel and view i have return some API logic in viewmodel and getting one dictionary after some logic..i want to access that dictionary value from view for ex.

viewmodel.someDic

but for now every-time i am getting empty dic.

class Viewmodel: ObservableObject {
@Published private var poductDetails:[String:ProductDetail] = [:]

   func createItems(data: ProductRootClass) {
        var productDetils = [String: SelectedProductDetail](){
         //some logic
         productDetils // with some object
         self.poductDetails = productDetils
        }
    }
}


struct View: View {
    @StateObject var viewModel: ViewModel

  var body: some View {
        VStack(alignment: .leading) {
           Text("(viewModel.poductDetails)")
        }
        .onAppear(perform: {
            print("(viewModel.poductDetails)")
        })
   }
}

I want to access this dictionary from view.

I tried accessing by returning productDetils from any function but get empty everytime.

may i know the way to access property from viewmodel to view?

Tags:

3

Answers


  1. 0

    You need a class conforming to ObservableObject and a property marked as @Published

    class ViewModel : ObservableObject {

   @Published var productDetails = [String:ProductDetail]()

   func createItems(data: ProductRootClass) {
        var productDetils = [String: SelectedProductDetail]()
         //some logic
         productDetils // with some object
         self.productDetails = productDetils
        
    }
}

    Whenever the property is modified the view will be updated.

    In the view create an instance and declare it as @StateObject

    struct ContentView: View {
  @StateObject var viewModel = ViewModel()

  var body: some View {
        VStack(alignment: .leading) {
           ForEach(viewModel.productDetails.keys.sorted(), id: .self) { key in
               Text("(viewModel.poductDetails[key]["someOtherKey"] as! String)")
           }
        }
   }
}

    I would prefer an array as model, it’s easier to access

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  2. 0

    You can make your viewModel as a Singleton.

    class ViewModel : ObservableObject {
    static let viewModelSingleton = ViewModel()
    @Published var productDetails = [String : ProductDetail]()
    \API logic}

    Access this viewModel Singleton in the view

    struct view : View {
    @ObservedObject var viewModelObject = ViewModel.viewModelSingleton

    var body: some View {
         VStack(alignment: .leading) {
             Text("(viewModelObject.productDetails)")
      }
 }}
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  3. 0

    You need to get rid of the view model and make a proper model.

    class Model: ObservableObject {
    @Published private var productDetails:[ProductDetail] = []

}

struct ProductDetail: Identifiable {
    let id = UUID()
    var title: String

}

    Now you can do ForEach(model.productDetails)

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