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To respond to the reselection of an item in a SwiftUI Picker, you can use the .onChange() modifier.

Here's an example:

struct ContentView: View {
    @State private var selectedColor = "Red"

    var body: some View {
        VStack {
            Text("Selected color: \(selectedColor)")

            Picker("Colors", selection: $selectedColor) {
                Text("Red").tag("Red")
                Text("Green").tag("Green")
                Text("Blue").tag("Blue")
            }
            .pickerStyle(SegmentedPickerStyle())
            .onChange(of: selectedColor) { value in
                print("Selected color changed to \(value)")
            }
        }
    }
}

In this example, we have a Picker with three options, and we're using a segmented picker style.

We're also using the .onChange() modifier to print a message to the console whenever the selected color changes.

You can replace the print() statement with any code you want to execute when the selected item is reselected.