ScrollViewReader's proxy.scrollTo not scrolling

Question

I have this SwiftUI code that builds a large UI view that's too big to fit on screen, so I've put it in a 2D scrollview. While this example is a grid, let's assume the content fills just as much but the items are more randomly placed. When the view appears, I want it to start with having one of these items centered, in the case below the item with ID "(25,25)". This compiles fine, and looks fine by the docs, and runs, but does not scroll to the ZStack with ID "(25,25)". Why does it not scroll to this ZStack? The code was tested with both iOS 14 and iOS 15b1.

var body: some View {
    ScrollViewReader { scrollView in
        ScrollView([.horizontal, .vertical]) {
            VStack(alignment: .leading, spacing: 0) {
                ForEach(0..<50) { y in
                    HStack(alignment: .center, spacing: 0) {
                        ForEach(0..<50) { x in
                            ZStack {
                                Circle()
                                    .frame(width: 35, height: 35)
                                    .foregroundColor(.blue.opacity(0.5))
                                Text("(\(x),\(y)")
                                    .font(.system(size: 8))
                            }
                            .offset(x: CGFloat(x * 25), y: CGFloat(y * 25))
                            .id("(\(x),\(y))")
                        }
                    }
                }
            }
            
        }
        .onAppear {
            DispatchQueue.main.asyncAfter(deadline: .now() + 3.0) {
                scrollView.scrollTo("(25,25)")
            }
        }
    }
}

Answer 1

I think you're mistaking offset for padding, with just padding it works.

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It does look like the not scrolling to a view with offset is a bug though.

Theoretically your code has a mistake: You add an ID to the view before the offset, so when you scroll to that ID it scrolls to where the view was before the offset.

Switch offset and id around and it should work (it doesn't though which makes me think there is a SwiftUI bug somewhere here).