Generic struct 'ForEach' requires that 'Set<Exercise>' conform to 'Ra-CodePudding

I am getting the error: "Generic struct 'ForEach' requires that 'Set' conform to 'RandomAccessCollection'" when trying to display items I have selected from a list in another view.

import SwiftUI

struct ExSetView: View {
    
    @Environment(\.managedObjectContext) var viewContext
    @Environment(\.dismiss) var dismiss
    @State var selectedItems = Set<Exercise>()
    
    var body: some View {
        NavigationView {
            VStack (alignment: .leading) {
                Text("Set Count: \(selectedItems.count)")
                ForEach(selectedItems) { e in
                    NavigationLink(
                        destination: ExSetInputView(exset: e),
                        label: {
                            Text(e.exercisename)
                        }
                    )}
            }
        }
    }
}

The error is on the line ForEach(selectedItems) { e in

I have no clue how to fix this. Ultimately I just want to display the selected items by their property of exercisename as a navigation link. Is there another way without using For Each? Is the issue because it is a set and not an array? Any help would be greatly appreciated!!!!

CodePudding user response：

ForEach requires an ordered data source, a Set is unordered by definition.

A simple solution is to sort the Set for example by exercisename

ForEach(selectedItems.sorted{$0.exercisename < $1.exercisename})

The result of sorted is an array which is 'RandomAccessCollection compliant.