Add Search Bar to UITableView

Add UISearchBar to UITableView

public override void ViewDidLoad()
{
    base.ViewDidLoad();
    // Perform any additional setup after loading the view, typically from a nib.

    //Declare the search bar and add it to the header of the table
    searchBar = new UISearchBar();
    searchBar.SizeToFit();
    searchBar.AutocorrectionType = UITextAutocorrectionType.No;
    searchBar.AutocapitalizationType = UITextAutocapitalizationType.None;
    searchBar.TextChanged += (sender, e) =>
    {
        //this is the method that is called when the user searches
        searchTable();
    };

    Title = "SearchBarWithTableView Sample";
    table = new UITableView(new CGRect(0, 20, View.Bounds.Width, View.Bounds.Height - 20));
    //table.AutoresizingMask = UIViewAutoresizing.All;
    tableItems = new List<TableItem>();

    tableItems.Add(new TableItem("Vegetables") { ImageName = "Vegetables.jpg" });
    tableItems.Add(new TableItem("Fruits") { ImageName = "Fruits.jpg" });
    tableItems.Add(new TableItem("Flower Buds") { ImageName = "Flower Buds.jpg" });
    tableItems.Add(new TableItem("Legumes") { ImageName = "Legumes.jpg" });
    tableItems.Add(new TableItem("Tubers") { ImageName = "Tubers.jpg" });
    tableSource = new TableSource(tableItems);
    table.Source = tableSource;
    table.TableHeaderView = searchBar;
    Add(table);
}

private void searchTable()
{
    //perform the search, and refresh the table with the results
    tableSource.PerformSearch(searchBar.Text);
    table.ReloadData();
}

The TableSource class will look like this:

public class TableSource : UITableViewSource
{
    private List<TableItem> tableItems = new List<TableItem>();
    private List<TableItem> searchItems = new List<TableItem>();
    protected string cellIdentifier = "TableCell";

    public TableSource(List<TableItem> items)
    {
        this.tableItems = items;
        this.searchItems = items;
    }

    public override nint RowsInSection(UITableView tableview, nint section)
    {
        return searchItems.Count;
    }

    public override UITableViewCell GetCell(UITableView tableView, NSIndexPath indexPath)
    {
        // request a recycled cell to save memory
        UITableViewCell cell = tableView.DequeueReusableCell(cellIdentifier);


        var cellStyle = UITableViewCellStyle.Default;

        // if there are no cells to reuse, create a new one
        if (cell == null)
        {
            cell = new UITableViewCell(cellStyle, cellIdentifier);
        }

        cell.TextLabel.Text = searchItems[indexPath.Row].Title;
        cell.ImageView.Image = UIImage.FromFile("Images/" + searchItems[indexPath.Row].ImageName);

        return cell;
    }

    public override nint NumberOfSections(UITableView tableView)
    {
        return 1;
    }

    public void PerformSearch(string searchText)
    {
        searchText = searchText.ToLower();
        this.searchItems = tableItems.Where(x => x.Title.ToLower().Contains(searchText)).ToList();
    }
}

Remarks

Object References:

UITableView table;
TableSource tableSource;
List tableItems;
UISearchBar searchBar;

To fork the complete sample: https://github.com/adiiaditya/Xamarin.iOS-Samples/tree/master/SearchBarWithTableView