Is it possible to create SwiftIO Namespace programmatically? - swiftui

Question

I am creating scrollview as follows and I want to go requested button in array
using Namespace variable.
I saw it used to to go to bottom or top of scrollview but Namespace variables created manually. Because I want to go any button might requested I want to create Namespace
for every item in scrollview not only for top or bottom one.
Is it possible to create Namespace ID using index somehow valueIndex in that case.
I hope it would be something like that selectIndex as Namespace.
ScrollViewReader { proxy in
ScrollView(.horizontal, showsIndicators: true){
LazyHStack() {
ForEach(0..<listValues[valueIndex].count, id: \.self) { selectIndex in
Button(action: {
dump(selectIndex)
}){
Text(listValues[valueIndex][selectIndex])
.foregroundColor(Color.white)
.background(Color.red)
.frame(width: w2 * 0.5 * 0.5, height: 40)
} .id(**selectIndex as Namespace**)
}.background(Color.gray)
}
}.frame(width: w2 * 0.5 * 0.5, height: 40)
}

Answer 1

You don't need a NameSpace in a ScrollViewReader, you just need to use any Hashable to identify the place you want to scroll to. You didn't give a Minimal Reproducible Example (MRE), and I couldn't find a straightforward scroll to answer, so I made a basic one to show you how it is done. Please see the comments.
// You should always use an Identifiable in a ForEach. For
// a `scrollTo()`, you only need a `Hashable` `.id()`, so
// this struct has been conformed to Hashable.
struct ScrollItem: Identifiable, Hashable {
let id = UUID()
var name: String
}
struct ScrollToView: View {
let scrollItems: [ScrollItem] = Array(0..<100).map( { ScrollItem(name: "Row " + $0.description) })
#State var selectedItem: ScrollItem?
var body: some View{
ScrollViewReader{ scrollReader in
VStack {
// This button scrolls the selected row to the top, or as high as it can go
Button {
withAnimation {
scrollReader.scrollTo(selectedItem, anchor: .top)
}
} label: {
Text(selectedItem != nil ? "Scroll \(selectedItem!.name) To Top" : "Select Row")
}
List {
// ScrollItem is Identifiable, so you do not need to designate id:
ForEach(scrollItems) { item in
Text(item.name)
.padding()
.frame(maxWidth: .infinity, minHeight: 50, alignment: .leading)
// If the row is selected, this gives a colored background
.background(
RoundedRectangle(cornerRadius: 15)
.fill(selectedItem == item ? Color.yellow.opacity(0.4) : Color.clear)
)
.contentShape(RoundedRectangle(cornerRadius: 15))
// This allows you to select and deselect the row
.onTapGesture {
if selectedItem == item {
selectedItem = nil
} else {
selectedItem = item
}
}
// ScrollItem conforms to Hashable, so it can be used as the .id()
.id(item)
}
}
// This button scrolls the selected row to the bottom, or as low as it can go
Button {
withAnimation {
scrollReader.scrollTo(selectedItem, anchor: .bottom)
}
} label: {
Text(selectedItem != nil ? "Scroll \(selectedItem!.name) To Bottom" : "Select Row")
}
}
}
}
}