How to modify a user input inside a SwiftUI form loop - swift

Question

I'm developing a simple SwiftUI app in Xcode 11. I want to have a form that loops through multiple user input strings and displays a form with a button. When the user presses the button it modifies the input value - specifically increment or decrement it.
However when passing an array of references like UserInput().foo where UserInput is a published observable object I cannot modify the value inside a ForEach because the ForEach is passed a copy as oppose to the original reference (at least that's my basic understanding). How do I then try to achieve it? I read about inout and everybody says to avoid it but surely this must be a relatively common issue.
I've made an simple example of what I'm trying to do but I can't quite work it out:
import SwiftUI
class UserInput: ObservableObject {
#Published var foo: String = ""
#Published var bar: String = ""
}
struct ContentView: View {
#ObservedObject var input = UserInput()
var body: some View {
LoopInputs()
}
func LoopInputs() -> AnyView?{
var userinputs = [
[UserInput().foo, "Foo"],
[UserInput().bar, "Bar"]
]
var inputs: some View{
VStack(){
ForEach(userinputs, id: \.self){userinput in
Text("\(userinput[1]): \(String(userinput[0]))")
Button(action: {
increment(input: String(userinput[0]))
}){
Text("Increase")
}
}
}
}
return AnyView(inputs)
}
func increment(input: String){
var lead = Int(input) ?? 0
lead += 1
// input = String(lead)
}
}

Answer 1

As I understood, when adding a value to userinputs, the ForEach values doesn't change.
Well, if that's the case, first of all, you could try creating a struct and in it, you declare foo and bar, then just declare a variable of type the struct. It'll look like this:
struct Input: Identifiable {
var id = UUID()
var foo: String
var bar: String
}
class UserInput: ObservableObject {
#Published var inputs: [Input] = [Input]()
}
//ContentView
struct ContentView: View {
#ObservedObject var input = UserInput()
var body: some View {
LoopInputs()
}
func LoopInputs() -> AnyView? {
var inputs: some View {
VStack {
ForEach(input.inputs) { userinput in
Text("\(userinput.bar): \(String(userinput.foo))")
Button(action: {
increment(input: String(userinput.foo))
}) {
Text("Increase")
}
}
}
}
return AnyView(inputs)
}
func increment(input: String) {
var lead = Int(input) ?? 0
lead += 1
// input = String(lead)
}
}
Wouldn't this be easier and more elegant?