SwiftUI: Two way binding with @State and @binding

two-way-binding.swift

import SwiftUI
import PlaygroundSupport

struct ContentView: View {

    @State private var sliderValue: CGFloat = 0
    private var minSliderValue: CGFloat = 10
    private var maxSliderValue: CGFloat = 100

    var body: some View {
        VStack {
            Text("Slider value: \(Int(sliderValue))").foregroundColor(.blue).font(.title3)
            MySlider(value: $sliderValue, minValue: minSliderValue, maxValue: maxSliderValue)
        }.padding(20)
    }
}

struct MySlider : View {

    @Binding var value: CGFloat

    var minValue: CGFloat
    var maxValue: CGFloat

    var body: some View {
        HStack {
            Text("\(Int(minValue))")
                .foregroundColor(.blue)
            Slider(value: $value, in: minValue...maxValue, step: 1)
            Text("\(Int(maxValue))")
                .foregroundColor(.blue)
        }.frame(width: 300)
        .padding()
    }
}

PlaygroundPage.current.setLiveView(ContentView())