How can I run an action when a state changes?

Question

enum SectionType: String, CaseIterable {
    case top = \"Top\"
    case best = \"Best\"
}

struct ContentView : View {
    @State private var selection: Int = 0

           


        

Answer 1

Here is another option if you have a component that updates a @Binding. Rather than doing this:

Component(selectedValue: self.$item, ...)

you can do this and have a little greater control:

Component(selectedValue: Binding(
    get: { self.item },
    set: { (newValue) in
              self.item = newValue
              // now do whatever you need to do once this has changed
    }), ... )

This way you get the benefits of the binding along with the detection of when the Component has changed the value.