CODEWITHSUNDEEP
swiftuiswiftui-scrollview
Jan Ivashenko
Jan Ivashenko

Reputation: 3

Get optimized ScrollView value IOS

I need to get the ScrollView value, and I already have one solution, but it's not very optimized. And I have a strong feeling that I'm missing a simpler solution. My final goal is get the ScrollView value to animate the closure of the block (as in the weather app from Apple). Please Help

There is no optimized solution here

ScrollView(.vertical, content: {
    Vstack(content:{
        Rectaingle()
            .frame(width:100, height: 100)
    })
    .background(GeometryReader {
                            Color.clear.preference(key: ViewOffsetKey.self,
                            value: -$0.frame(in: .named("scroll")).origin.y)
    })
    .onPreferenceChange(ViewOffsetKey.self) {mainScrollValue = $0}
                 
})
.coordinateSpace(name: "scroll")
.scrollIndicators(.never)

Working on IOS 16.0

Upvotes: 0

Views: 55

Answers (1)

Benzy Neez
Benzy Neez

Reputation: 21700

If you are looking for a solution that involves less code then I would suggest using .onGeometryChange. This is compatible with iOS 16:

struct ContentView: View {
    @State private var scrollOffset = CGFloat.zero

    var body: some View {
        ScrollView {
            VStack {
                Rectangle()
                    .frame(width: 100, height: 100)
            }
            .onGeometryChange(for: CGFloat.self) { proxy in
                proxy.frame(in: .named("scroll")).minY
            } action: { minY in
                scrollOffset = minY
            }
        }
        .coordinateSpace(name: "scroll")
        .scrollIndicators(.never)
    }
}

Upvotes: 0

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