How to pass data from a modal view list to parent view in SwiftUI?-CodePudding

I have (probably) an easy question related to SwiftUI state management.

A have a modal view with a simple list of buttons:

struct ExerciseList: View {
    var body: some View {
        List {
            ForEach(1..<30) { _ in
                Button("yoga") {
                    
                }
            }
        }
    }
}

The parent view is this one:

struct SelectExerciseView: View {
  
    @State private var showingSheet = false
    @State private var exercise = "select exercise"
    
    var body: some View {
        Button(exercise) {
            showingSheet.toggle()
        }
           .sheet(isPresented: $showingSheet){
               ExerciseList()
           }
    }
}

How can I do to pass the selected button text from the list to the parent view ?
I'm thinking that I need a Binding variable inside the modal and use that, but not really sure how in this example.

CodePudding user response：

At its most basic, you need the selected exercise in your parent view (SelectExerciseView) as a state variable. You then pass that in to the child view (the modal) via a binding. Assuming exercise as a string holds the variable you want to change:

.sheet(isPresented: $showingSheet) {
  ExerciseList(exercise: $exercise)
}

Your modal then needs to have a @Binding reference.

struct ExerciseList: View {
  @Binding var exercise: Exercise

  var body: some View {
    List {
      ForEach(1..<30) { _ in
        Button("yoga") {
          exercise = "yoga"                    
        }
      }
    }
  }
}

CodePudding user response：

Im not sure what you're asking...

Are you trying to show a "Detail View" from the modal.

Meaning theres the parent view -> Modal View -> Detail View

In your case it would be the SelectExerciseView -> ExerciseListView -> DetailView which shows the text of the button that was pressed on the previous view (can be any view you want)

If thats what you're trying to do I would use a NavigationLink instead of a button on the modal. The destination of the NavigationLink would be the detail view