FeedbackButton.swift

import SwiftUI

struct FeedbackPreparationButtonStyle: ButtonStyle {
    
    let feedbackGenerator: UIImpactFeedbackGenerator

    func makeBody(configuration: Configuration) -> some View {
        if configuration.isPressed { feedbackGenerator.prepare() }
        return configuration.label
            // Mimic the default ButtonStyle which we override with this one
            .opacity(configuration.isPressed ? 0.25 : 1)
            .scaleEffect(configuration.isPressed ? 0.92 : 1)
            .animation(.easeInOut)
    }
}

struct FeedbackButton<Label: View>: View {

    let feedbackGenerator: UIImpactFeedbackGenerator
    let action: () -> Void
    let label: () -> Label
    
    init(style: UIImpactFeedbackGenerator.FeedbackStyle,
         action: @escaping () -> Void,
         @ViewBuilder label: @escaping () -> Label) {
        self.feedbackGenerator = UIImpactFeedbackGenerator(style: style)
        self.action = action
        self.label = label
    }
    
    var body: some View {
        Button(action: {
            self.feedbackGenerator.impactOccurred()
            self.action()
        }, label: self.label)
        .buttonStyle(FeedbackPreparationButtonStyle(feedbackGenerator: self.feedbackGenerator))
    }
}