List reload animation glitches - ios

Question

So I have a list that changes when user fill in search keyword, and when there is no result, all the cells collapse and somehow they would fly over to the first section which looks ugly. Is there an error in my code or is this an expected SwiftUI behavior? Thanks.
import SwiftUI
struct ContentView: View {
#ObservedObject var viewModel = ViewModel(photoLibraryService: PhotoLibraryService.shared)
var body: some View {
NavigationView {
List {
Section {
TextField("Enter Album Name", text: $viewModel.searchText)
}
Section {
if viewModel.libraryAlbums.count > 0 {
ForEach(viewModel.libraryAlbums) { libraryAlbum -> Text in
let title = libraryAlbum.assetCollection.localizedTitle ?? "Album"
return Text(title)
}
}
}
}.listStyle(GroupedListStyle())
.navigationBarTitle(
Text("Albums")
).navigationBarItems(trailing: Button("Add Album", action: {
PhotoLibraryService.shared.createAlbum(withTitle: "New Album \(Int.random(in: 1...100))")
}))
}.animation(.default)
}
}

Answer 1

1) you have to use some debouncing to reduce the needs to refresh the list, while typing in the search field
2) disable animation of rows
The second is the hardest part. the trick is to force recreate some View by setting its id.
Here is code of simple app (to be able to test this ideas)
import SwiftUI
import Combine
class Model: ObservableObject {
#Published var text: String = ""
#Published var debouncedText: String = ""
#Published var data = ["art", "audience", "association", "attitude", "ambition", "assistance", "awareness", "apartment", "artisan", "airport", "atmosphere", "actor", "army", "attention", "agreement", "application", "agency", "article", "affair", "apple", "argument", "analysis", "appearance", "assumption", "arrival", "assistant", "addition", "accident", "appointment", "advice", "ability", "alcohol", "anxiety", "ad", "activity"].map(DataRow.init)
var filtered: [DataRow] {
data.filter { (row) -> Bool in
row.txt.lowercased().hasPrefix(debouncedText.lowercased())
}
}
var id: UUID {
UUID()
}
private var store = Set<AnyCancellable>()
init(delay: Double) {
$text
.debounce(for: .seconds(delay), scheduler: RunLoop.main)
.sink { [weak self] (s) in
self?.debouncedText = s
}.store(in: &store)
}
}
struct DataRow: Identifiable {
let id = UUID()
let txt: String
init(_ txt: String) {
self.txt = txt
}
}
struct ContentView: View {
#ObservedObject var search = Model(delay: 0.5)
var body: some View {
NavigationView {
VStack(alignment: .leading) {
TextField("filter", text: $search.text)
.padding(.vertical)
.padding(.horizontal)
List(search.filtered) { (e) in
Text(e.txt)
}.id(search.id)
}.navigationBarTitle("Navigation")
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
ContentView()
}
}
and i am happy with the result