/// <summary>
/// show popup
/// </summary>
/// <param name="uniPopupHandler">popup wanna show</param>
public void Show(IUniPopupHandler uniPopupHandler)
{
var lastOrder = 0;
if (_stacks.Count > 0)
{
var top = _stacks.Peek();
lastOrder = top.Canvas.sortingOrder;
}
uniPopupHandler.UpdateSortingOrder(lastOrder + 10);
SortingOrder.OnNext(lastOrder);
_stacks.Push(uniPopupHandler);
uniPopupHandler.Show(); // show
}
