SwiftUI scrollview sticky header without using List

Question

I've been fighting with GeometryReader and .onChange(of: geo.frame(in: .global).minY) for a long time trying to get this to work with no great success. Consider the following:

struct TestScreen: View {
    
    var body: some View {
        NavigationStack {
            ScrollView {
                VStack {
                    Text("View A")
                        .frame(height: 50)
                        .frame(maxWidth: .infinity)
                        .background(.green)
                    Text("View B - Sticky")
                        .frame(height: 50)
                        .frame(maxWidth: .infinity)
                        .background(.blue)
                    ForEach(0..<15) { i in
                        Text("View \(i)")
                            .frame(height: 50)
                            .frame(maxWidth: .infinity)
                            .background(Color.red)
                    }
                }
                
            }
            .navigationBarTitleDisplayMode(.inline)
            .toolbarBackground(.clear, for: .navigationBar)
            .toolbar {
                ToolbarItem(placement: .principal) {
                    Text("Testing")
                        .foregroundColor(.purple)
                }
            }
        }
    }
}

The goal is to make View B stick to the top (just under the navigation bar) when you scroll the view upwards, and of course take its normal place in the scrollview when you scroll back down. I know you can do sticky headers with List and Sections but that doesn't suit my needs because note that View B (the sticky view) isn't necessarily the first item in the scrollview.

Also note that View B must stay on top of all other content in the VStack so that the other content scrolls beneath it.

malhal · Accepted Answer · 2025-01-03 00:03:19Z

8

Try using a LazyVStack with sections and pinned headers:

The first section contains View A, with no header.
The second section contains the ForEach as its main content and View B as its header.

ScrollView {
    LazyVStack(pinnedViews: .sectionHeaders) {
        Section {
            Text("View A")
                // ... modifiers as before
        }
        Section {
            ForEach(0..<15) { i in
                // ... content as before
            }
        } header: {
            Text("View B - Sticky")
                // ... modifiers as before
        }
    }
}

Animation

edited Jan 3 at 0:03

malhal

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answered Jan 2 at 21:02

Benzy Neez

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3 Comments

soleil Jan 2 at 22:21

Works like a charm.

Rajbeer Singh Aug 22 at 16:01

how can we make it work better when the scroll view is ignoring top safe area with the use of modifier: .ignoresSafeArea(.container, edges: .top)? Instead of behaving View B as sticky at the top edge of the screen, I want it to behave sticky exactly below the navigation bar.

Benzy Neez Aug 22 at 16:34

Try removing the modifier .ignoresSafeArea from the ScrollView. By default, the ScrollView will scroll through the safe area anyway, as you can just detect from the gif in the answer. If the background to the navigation bar would be hidden then of course you would see it better. Otherwise, if it's not as simple as that, I would suggest posting a new question, with an MRE to demonstrate the issue.

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