ios - @Binding and ForEach in SwiftUI

Question

I can't undertand how to use @Binding in combination with ForEach in SwiftUI. Let's say I want to create a list of Toggles from an array of booleans.

struct ContentView: View {
    @State private var boolArr = [false, false, true, true, false]

    var body: some View {
        List {
            ForEach(boolArr, id: .self) { boolVal in
                Toggle(isOn: $boolVal) {
                    Text("Is (boolVal ? "On":"Off")")
                }                
            }
        }
    }
}

I don't know how to pass a binding to the bools inside the array to each Toggle. The code here above gives this error:

Use of unresolved identifier '$boolVal'

And ok, this is fine to me (of course). I tried:

struct ContentView: View {
    @State private var boolArr = [false, false, true, true, false]

    var body: some View {
        List {
            ForEach($boolArr, id: .self) { boolVal in
                Toggle(isOn: boolVal) {
                    Text("Is (boolVal ? "On":"Off")")
                }                
            }
        }
    }
} 

This time the error is:

Referencing initializer 'init(_:id:content:)' on 'ForEach' requires that 'Binding' conform to 'Hashable'

Is there a way to solve this issue?

question from:https://stackoverflow.com/questions/57340575/binding-and-foreach-in-swiftui

Answer 1

You can use something like the code below. Note that you will get a deprecated warning, but to address that, check this other answer: https://stackoverflow.com/a/57333200/7786555

import SwiftUI

struct ContentView: View {
    @State private var boolArr = [false, false, true, true, false]

    var body: some View {
        List {
            ForEach(boolArr.indices) { idx in
                Toggle(isOn: self.$boolArr[idx]) {
                    Text("boolVar = (self.boolArr[idx] ? "ON":"OFF")")
                }
            }
        }
    }
}