SwiftUI: Pinned header view inside horizontal scroll view for lazy grid

Question

I would like to add a pinned header view to a lazy grid. The lazy grid should be horizontally scrollable.

The problem is that above and below there is also content which should not scroll horizontally. Otherwise the problem could be solved easily by setting the outer ScrollView scrolling behavior to ([.horizontal, .vertical]) and remove the inner.

In the example code everything works correctly, but the header view is not pinned at the top when scrolling vertically. It scrolls away like any other content above the grid. Maybe this is an issue with SwiftUI itself.

struct ContentView: View {
    var body: some View {
        ScrollView(.vertical) {
            Text("Other content")
                .frame(maxWidth: .infinity, minHeight: 100)
                .background(Color.yellow)

            ScrollView(.horizontal) {
                LazyVGrid(
                    columns: Array(repeating: GridItem(.fixed(200), spacing: 0, alignment: .center), count: 9),
                    spacing: 16,
                    pinnedViews: [.sectionHeaders]
                ) {
                    Section(header: header) {
                        ForEach(1..<500) {
                            Text("Cell #\($0)")
                        }
                    }
                }
            }

            Text("Other content")
                .frame(maxWidth: .infinity, minHeight: 100)
                .background(Color.yellow)
        }
    }

    var header: some View {
        LazyVGrid(
            columns: Array(repeating: GridItem(.fixed(200), spacing: 0, alignment: .center), count: 9),
            spacing: 16
        ) {
            ForEach(1..<10) {
                Text("Header \($0)")
            }
        }
        .padding(.vertical)
        .background(Color.blue)
        .foregroundColor(.white)
    }
}

So how do I get the header pinned correctly to the top?

Apix_D · Accepted Answer · 2021-07-28 11:10:35Z

0

did you already tried something like this:

var body: some View {
    VStack{
       Text ("My Header")
       .multilineTextAlignment(.center)
...
    }
    ScrollView(.horizontal){
        LazyVStack{
...
    }
}

First write your Text in a normal VStack and close the VStack befor using your ScrollView.

answered Jul 28, 2021 at 11:10

Apix_D

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1 Comment

Lars Over a year ago

I tested that, the problem is that either I can't scroll vertically anymore (when the ScrollView around the grid has only horizontal scrolling, so the content overflows) or the LazyVGrid is not displayed in full height anymore and I have to scroll vertically in it.

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