partial void UpdateKeyboardThemePartial()
{
if (_textBoxView == null)
{
return;
}
// if KeyboardAppearance has been explicitly set, we leave it as is.
if (KeyboardAppearance != UIKeyboardAppearance.Default)
{
return;
}
ElementTheme?GetExplicitlySetAppTheme() => Application.Current.IsThemeSetExplicitly
? Application.Current.ActualElementTheme as ElementTheme?
: null;
// the appearance will be determined by the first parent/self that has a non-default RequestedTheme,
// or the explicitly requested application theme.
// note: the literal "Default" value is lost on the ActualTheme property, which is why we are not using it here.
var theme = VisualTreeHelper.EnumerateAncestors(this).OfType <FrameworkElement>()
.Prepend(this)
.Select(x => x.RequestedTheme as ElementTheme?)
.Append(GetExplicitlySetAppTheme())
.FirstOrDefault(x => x != ElementTheme.Default);
var appearance = theme switch
{
ElementTheme.Light => UIKeyboardAppearance.Light,
ElementTheme.Dark => UIKeyboardAppearance.Dark,
_ => UIKeyboardAppearance.Default
};
_textBoxView.KeyboardAppearance = appearance;
}
}