For any Xamarin.iOS developers, here's how to do it in C#
public partial class MyViewController : UIViewController
{
public override void ViewDidLoad()
{
base.ViewDidLoad();
ConfigurePicker();
}
void ConfigurePicker()
{
var pickerTextField = new UITextField();
var picker = new UIPickerView
{
Model = new PickerViewModel(),
ShowSelectionIndicator = true
};
var screenWidth = UIScreen.MainScreen.Bounds.Width;
var pickerToolBar = new UIToolbar(new RectangleF(0, 0, (float)screenWidth, 44)) { BarStyle = UIBarStyle.Default, Translucent = true };
var flexibleSpaceButton = new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace);
var doneButton = new UIBarButtonItem(UIBarButtonSystemItem.Done, (sender, e) => pickerTextField.ResignFirstResponder());
pickerToolBar.SetItems(new[] { flexibleSpaceButton, doneButton }, false);
pickerTextField.InputView = picker;
pickerTextField.InputAccessoryView = pickerToolBar;
}
class PickerViewModel : UIPickerViewModel
{
int[] _pickerSource = new []{ 1, 2, 3, 4, 5 };
public override nint GetRowsInComponent(UIPickerView pickerView, nint component) => _pickerSource.Count;
public override string GetTitle(UIPickerView pickerView, nint row, nint component) => _pickerSource[(int)row];
public override nint GetComponentCount(UIPickerView pickerView) => 1;
}
}