How to create haptic feedback for a Button in SwiftUI?

Question

I\'m trying to implement haptic feedback at the beginning of a tap for a Button in SwiftUI. Therefore I\'m trying to use simultaneousGesture, but I\'m sill struggling. I can\'t

Answer 1

pure SwiftUI solution below:

HStack {
    Image("icon")
    Text("Login")
}
.onTouchGesture(
    touchBegan: { self.generateHapticFeedback = true },
    touchEnd: { _ in self.generateHapticFeedback = false }
)

Just add this snippet somewhere in your project:

struct TouchGestureViewModifier: ViewModifier {
    let touchBegan: () -> Void
    let touchEnd: (Bool) -> Void

    @State private var hasBegun = false
    @State private var hasEnded = false

    private func isTooFar(_ translation: CGSize) -> Bool {
        let distance = sqrt(pow(translation.width, 2) + pow(translation.height, 2))
        return distance >= 20.0
    }

    func body(content: Content) -> some View {
        content.gesture(DragGesture(minimumDistance: 0)
                .onChanged { event in
                    guard !self.hasEnded else { return }

                    if self.hasBegun == false {
                        self.hasBegun = true
                        self.touchBegan()
                    } else if self.isTooFar(event.translation) {
                        self.hasEnded = true
                        self.touchEnd(false)
                    }
                }
                .onEnded { event in
                    if !self.hasEnded {
                        let success = !self.isTooFar(event.translation)
                        self.touchEnd(success)
                    }
                    self.hasBegun = false
                    self.hasEnded = false
                })
    }
}

extension View {
    func onTouchGesture(touchBegan: @escaping () -> Void = {},
                        touchEnd: @escaping (Bool) -> Void = { _ in }) -> some View {
        modifier(TouchGestureViewModifier(touchBegan: touchBegan, touchEnd: touchEnd))
    }
}