How to create own ScrollView using DragGesture?

Question

I'm trying to mimic ScrollView behaviour in my own custom component.

The thing I'm having trouble with is scroll animation. As far I understand I can use predictedEndTranslation object to get the predicted position of the drag gesture. But I don't know which easing function I should use to mimic default ScrollView easing.

Here is my code

struct ViewContent: View {
    @State var offsetY: CGFloat = 0

    var body: some View {
        View {

        }
        .offset(y: offsetY)
        .gesture(
          DragGesture()
            .onChange { value in
                offsetY = value.translation.height
            }
            .onEnded { value in 
                let nextScrollPosition = value.predictedEndTranslation.height

                withAnimation(???) { // What easing to use?
                    offsetY = nextScrollPosition
                }
            }
        )
    }
}

Does this answer your question stackoverflow.com/a/58708206/12299030? — Asperi
– Asperi, Commented Jan 28, 2021 at 4:08

kevincrab · Accepted Answer · 2021-01-28 00:54:55Z

1

I would use .spring() as this preset animation will get you the closes to the generic scrollview animation.

withAnimation(.spring()) { // User .spring()
    offsetY = nextScrollPosition
}

answered Jan 28, 2021 at 0:54

kevincrab

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3 Comments

Roman Mahotskyi Over a year ago

Thanks, I tried to use this .spring() but wasn't sure if this easing is the best one

kevincrab Over a year ago

Can I ask why you cannot use a regular scrollview?

Roman Mahotskyi Over a year ago

I would like to implement snap interval (stop at the closest row or column, not at the middle or somewhere else) which is not supported in default ScrollView.

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