Cannot convert value of type 'String' to 'Binding<String>'

[jaywcjlove]

https://stackoverflow.com/a/59891334/1334703

TextField("placeholder", text: .constant(""))

struct SignInButtons_Previews: PreviewProvider {
    static var previews: some View {
        SignInButtons(backgroundColor: Color.blue,
                      signInUrl: .constant("http://www.apple.com"),
                      showModal: .constant(false))
    }
}

[jaywcjlove]

https://stackoverflow.com/a/57340694/1334703

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")")
                        .onAppear {
                            print(idx)
                        }
                }
            }
        }
    }
}

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

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

struct BoolSelect: Identifiable {
    var id = UUID()
    var isSelected: Bool
}

[jaywcjlove]

extension Binding where Value: MutableCollection, Value.Index == Int {
    func element(_ idx: Int) -> Binding<Value.Element> {
        return Binding<Value.Element>(
            get: {
                return self.wrappedValue[idx]
        }, set: { (value: Value.Element) -> () in
            self.wrappedValue[idx] = value
        })
    }
}

struct MainView: View {
    @Binding var text: [String]

    var body: some View {
        TextField("", text: $text.element(0))
        TextField("", text: $text.element(1))
        TextField("", text: $text.element(2))
    }
}

struct ContentView: View {
    var body: some View {
        MainView(text: .constant(["2", "3", "4"]))
    }
}

[jaywcjlove]

struct ContentView: View {
    @State private var boolArr = [
        BoolSelect(isSelected: true, title: ""),
        BoolSelect(isSelected: false, title: ""),
        BoolSelect(isSelected: true, title: "")
    ]

    var body: some View {
        VStack(alignment: .leading) {
            ForEach(boolArr.indices) { index in
                Toggle(isOn: self.$boolArr[index].isSelected) {
                    Text(self.boolArr[index].isSelected ? "ON":"OFF")
                }
                TextField("placeholder", text: Binding(
                    get: { return self.boolArr[index].title},
                    set: { (newValue) in return self.boolArr[index].title = newValue}
                ))
            }
        }
    }
}

struct BoolSelect: Identifiable {
    var id = UUID()
    var isSelected: Bool
    var title: String
}