throttle fast type searches

src/iOS.Autofill/LoginSearchViewController.cs

@@ -8,6 +8,7 @@ using Bit.iOS.Core.Controllers;
 using Bit.App.Resources;
 using Bit.iOS.Core.Views;
 using System.Threading;
+using System.Threading.Tasks;
 
 namespace Bit.iOS.Autofill
 {
@@ -163,6 +164,7 @@ namespace Bit.iOS.Autofill
         public class SearchDelegate : UISearchBarDelegate
         {
             private readonly LoginSearchViewController _controller;
+            private CancellationTokenSource _filterResultsCancellationTokenSource;
 
             public SearchDelegate(LoginSearchViewController controller)
             {
@@ -171,9 +173,29 @@ namespace Bit.iOS.Autofill
 
             public override void TextChanged(UISearchBar searchBar, string searchText)
             {
-                ((TableSource)_controller.TableView.Source).FilterResults(searchText, new CancellationToken());
+                var cts = new CancellationTokenSource();
+                Task.Run(async () =>
+                {
+                    if(!string.IsNullOrWhiteSpace(searchText))
+                    {
+                        await Task.Delay(300);
+                        if(searchText != searchBar.Text)
+                        {
+                            return;
+                        }
+                        else
+                        {
+                            _filterResultsCancellationTokenSource?.Cancel();
+                        }
+                    }
+                    try
+                    {
+                        ((TableSource)_controller.TableView.Source).FilterResults(searchText, cts.Token);
                         _controller.TableView.ReloadData();
                     }
+                    catch(OperationCanceledException) { }
+                }, cts.Token);
+            }
         }
     }
 }

src/iOS.Core/Views/ExtensionTableSource.cs

@@ -59,7 +59,9 @@ namespace Bit.iOS.Core.Views
                 combinedLogins.AddRange(logins);
             }
 
-            _allItems = combinedLogins.Select(s => new CipherViewModel(s))
+            _allItems = combinedLogins
+                .Where(c => c.Type == App.Enums.CipherType.Login)
+                .Select(s => new CipherViewModel(s))
                 .OrderBy(s => s.Name)
                 .ThenBy(s => s.Username)
                 .ToList() ?? new List<CipherViewModel>();