ScrollToIdOnSheet.swift

import SwiftUI



  struct BottomSheet: View {
    @State private var showSheet = false
    
    @State private var scrollToId = 0
    
    @State private var listView = true

    var myList: some View {
      ScrollViewReader { proxy in
        VStack {
          Button("Scroll to \(scrollToId)") {
            proxy.scrollTo(scrollToId)
          }


          if listView {
            List {
              ForEach(0..<500) { n in
                Button("\(n)") {
                  scrollToId = n
                  showSheet = false
                }
                .id(n)
              }
            }
          } else {
            
            
            
            let columns = [GridItem(.adaptive(minimum: 50))]
            
            ScrollView(.vertical) {
              LazyVGrid(columns: columns, spacing: 5) {
                ForEach(0..<250) { n in
                  Button("\(n)") {
                    scrollToId = n
                    showSheet = false
                  }
                  .id(n)
                }
              }
            }
          }
          
        }
        
        .onAppear {
          // want to scroll to the last press item on the list
          // but doesn't seem to work with ScrollView/LazyVGrid
          // but works with simple list
          proxy.scrollTo(scrollToId)
        }
      }
    }

    var body: some View {
      VStack {
        Button("Show List") {
          showSheet.toggle()
          listView = true
        }
        Button("Show Grid") {
          showSheet.toggle()
          listView = false
        }

        Text("scrollToId: \(scrollToId)")
      }
      .sheet(isPresented: $showSheet) {
        myList
          .presentationDetents([.large])
      }
    }
  }

  #Preview {
    BottomSheet()
  }