SwiftUI | Access PickerView selection from another SwiftUI View

Question

I tired to build a multicomponent picker based on user3441734 solution for a dynamic picker. This picker lives in its own .swift file. I can’t figure out how to save the selection in a variable to access it from another view again.

Here is my code so far. I marked my wrong solution with an 🛑 and its error message below.

import SwiftUI
struct DynamicPicker: View {
    @ObservedObject var model = Model()

    // var to store the selection
    @State var selection: String = ""

    var body: some View {

        VStack {

            GeometryReader { geometry in

                HStack {

                    Picker(selection: self.$model.selectedManufacturer, label: Text("")){
                        ForEach(0 ..< self.model.manufacturerNames.count){ index in
                            Text(self.model.manufacturerNames[index])
                        }
                    }.labelsHidden()
                        .frame(maxWidth: geometry.size.width * CGFloat(0.3333))
                        .clipped()

                    Picker(selection: self.$model.selectedStock, label: Text("")){
                        ForEach(0 ..< self.model.stockNamesCount){ index in
                            Text(self.model.stockNames[index])
                        }
                    }
                    .id(self.model.id)
                    .labelsHidden()
                    .frame(maxWidth: geometry.size.width * CGFloat(0.6666))
                    .clipped()
                }
            }

            // Show selection
            Text("\(self.model.manufacturerNames[model.selectedManufacturer])-\(self.model.stockNames[model.selectedStock])")

            // Save selection to variable 🛑
            selection = "\(self.model.manufacturerNames[model.selectedManufacturer])-\(self.model.stockNames[model.selectedStock])"
        }
    }
}

🛑 Type '()' cannot conform to 'View'; only struct/enum/class types can conform to protocols

Asperi · Accepted Answer · 2020-05-09 15:44:30Z

It is not needed additional selection, because the selection is already stored in model, so

1) remove these lines

@State var selection: String = ""

// Save selection to variable 🛑
selection = "\(self.model.manufacturerNames[model.selectedManufacturer])-\(self.model.stockNames[model.selectedStock])"

2) don't create inline model, just declare it to be able to inject via constructor

struct DynamicPicker: View {
    @ObservedObject var model: Model  // << here !!

3) use same model for DynamicPicker that other dependent view, let's suppose it is called ManufacturerView (having declared the same observed model as above). And there is some root view holding both, so it could be as

struct RootView: View {
    let model = Model() // << create it here

    var body: some View {
      VStack {
        DynamicPicker(model: self.model)
        ManufacturerView(model: self.model)
      }
    }
}

so when selection is updated in DynamicPicker then ManufacturerView will be updated automatically with corresponding selection, cause use same data source.

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