Making variable for each iteration in foreach loop SwiftUI - swift

Question

I have a nestled foreach loop and I want to modify data for each element in the nestled loop. Like this:
struct trainingView: View {
#ObservedObject var workout: Workout
#State private var reps: Int = 0
var body: some View {
ForEach(workout.exercises, id: \.self) { exercise in
Text(exercise.nameOfExercise)
ForEach(0..<exercise.amountOfSets, id: \.self) { Set in
Text("\(Set+1) Set")
Text(reps)
Stepper("Reps", value: $reps , in: 0...30)
}
}
}
}
I would like the variable rep to be independent from changes in an another elements stepper. If you need better examples of the code just ask.
This does not work as one change affects all elements. I have also tried making an #State object in the nestled loop but this doesn't work either. I have also tried making an array to store the data but this seemed complicated since the size of the array can change from different times. I have tried to search for the information on here but haven't found anyone answering it. I am fairly new to swiftUI and in need of help.

Answer 1

The Stepper in your example takes a Binding to a numeric value. If you create an array-of-arrays, you can create a Binding by accessing each row and element within it via their indices, e.g.:
struct Exercise: Identifiable, Equatable, Hashable {
let id = UUID()
let name: String
var sets: [Set]
}
struct Set: Identifiable, Equatable, Hashable {
let id = UUID()
let name: String
let requiredReps: Int = 10
var reps: Int = 0
}
class Workout: ObservableObject {
#Published var exercises: [Exercise]
init(exercises: [Exercise]) {
self.exercises = exercises
}
}
struct ContentView: View {
#StateObject var workout = Workout(exercises: [
Exercise(name: "Squats", sets: [Set(name: "Set 1"), Set(name: "Set 2"), Set(name: "Set 3")]),
Exercise(name: "Lunges", sets: [Set(name: "Set 1"), Set(name: "Set 2"), Set(name: "Set 3")]),
Exercise(name: "Burpees", sets: [Set(name: "Set 1"), Set(name: "Set 2"), Set(name: "Set 3")])
])
var body: some View {
List {
ForEach(workout.exercises) { exercise in
Section(exercise.name) {
let rowIndex = workout.exercises.firstIndex(of: exercise)!
HStack {
ForEach(exercise.sets) { set in
let objectIndex = exercise.sets.firstIndex(of: set)!
VStack {
Text(set.name + ": ") + Text(set.reps, format: .number) + Text("/") + Text(set.requiredReps, format: .number)
Stepper("Reps", value: $workout.exercises[rowIndex].sets[objectIndex].reps, in: 0...set.requiredReps)
.labelsHidden()
}
}
}
}
}
.padding()
}
}
}