protected override void OnElementChanged(ElementChangedEventArgs <Picker> e)
{
base.OnElementChanged(e);
if (e.NewElement != null && Control != null)
{
element = (CorePicker)e.NewElement;
element.Focused += FocusChangedEvent;
controlColor = element.EntryColor.ToCGColor();
if (element.IsEntryUnderline)
{
Control.BorderStyle = UITextBorderStyle.None;
}
UpdatePickerPlaceholder();
if (element.SelectedIndex <= -1)
{
UpdatePickerPlaceholder();
}
pickerView = (UIPickerView)Control.InputView;
if (!string.IsNullOrEmpty(element.FontFamily))
{
var font = UIFont.FromName(element.FontFamily, (nfloat)element.FontSize);
Control.Font = font;
}
}
}
protected override void OnElementChanged(ElementChangedEventArgs <Picker> e)
{
if (e.OldElement != null)
{
((INotifyCollectionChanged)e.OldElement.Items).CollectionChanged -= RowsCollectionChanged;
}
if (e.NewElement != null)
{
element = (CorePicker)e.NewElement;
if (Control == null)
{
var entry = new NoCaretField {
BorderStyle = UITextBorderStyle.RoundedRect
};
entry.EditingDidBegin += OnStarted;
entry.EditingDidEnd += OnEnded;
entry.EditingChanged += OnEditing;
_picker = new UIPickerView();
var width = UIScreen.MainScreen.Bounds.Width;
var toolbar = new UIToolbar(new CGRect(0, 0, width, 44))
{
BarStyle = UIBarStyle.Default, Translucent = true
};
var spacer = new UIBarButtonItem(UIBarButtonSystemItem.FlexibleSpace);
var doneButton = new UIBarButtonItem(UIBarButtonSystemItem.Done, (o, a) =>
{
var s = (PickerSource1)_picker.Model;
if (s.SelectedIndex == -1 && Element.Items != null && Element.Items.Count > 0)
{
UpdatePickerSelectedIndex(0);
}
UpdatePickerFromModel(s);
entry.ResignFirstResponder();
});
toolbar.SetItems(new[] { spacer, doneButton }, false);
entry.InputView = _picker;
entry.InputAccessoryView = toolbar;
_defaultTextColor = entry.TextColor;
SetNativeControl(entry);
}
_picker.Model = new PickerSource1(this);
UpdatePicker();
UpdateTextColor();
((INotifyCollectionChanged)e.NewElement.Items).CollectionChanged += RowsCollectionChanged;
}
base.OnElementChanged(e);
}
private void UpdatePickerPlaceholder()
{
if (element == null)
{
element = Element as CorePicker;
}
if (element.Placeholder != null)
{
Control.Placeholder = element.Placeholder;
}
}