Custom keyboard key press

import SwiftUI

struct PinPadKey: View {
    let digit: String
    let onTap: (String) -> Void

    var body: some View {
        Text(digit)
            .font(.title.monospacedDigit())
            .frame(width: 80, height: 80)
            .background(.thinMaterial, in: Circle())
            // Fire on touch-DOWN for a keyboard feel:
            .onLongPressGesture(minimumDuration: 0, perform: {}) { pressing in
                if pressing {
                    UIImpactFeedbackGenerator(style: .light)
                        .impactOccurred(intensity: 0.6)
                    onTap(digit)
                }
            }
    }
}

final class KeyButton: UIButton {
    // One shared generator for the whole keyboard = lowest latency
    static let haptic: UIImpactFeedbackGenerator = {
        let g = UIImpactFeedbackGenerator(style: .light)
        g.prepare()
        return g
    }()

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        Self.haptic.impactOccurred(intensity: 0.6)
        Self.haptic.prepare() // re-arm for the next key
    }
}