Uno Platform BottomNavBar取消选中所选项目

<BottomNavBar SelectedItem="{Binding SelectedItem}">
    <BottomNavBarItem Icon="home" Text="Home" />
    <BottomNavBarItem Icon="search" Text="Search" />
    <BottomNavBarItem Icon="settings" Text="Settings" />
</BottomNavBar>

private BottomNavBarItem _selectedItem;
public BottomNavBarItem SelectedItem
{
    get { return _selectedItem; }
    set
    {
        if (_selectedItem == value)
        {
            // 取消选中所选项目的逻辑
            _selectedItem = null;
        }
        else
        {
            _selectedItem = value;
            // 处理选中项目的逻辑
        }
        OnPropertyChanged(nameof(SelectedItem));
    }
}