如何在没有自定义渲染器的情况下更改Xamarin Forms Cross Platform中Listview所选项目的背景颜色

下面的代码非常适合我。但是，它会迭代整个ItemsSource，以重置先前选择的项目的背景。如果您想对其进行优化，则可以存储并重置它。希望这可以帮助。

<ListView x:Name="contactList" ItemsSource="{Binding PlatformsList}" ItemTapped="contactList_ItemTapped"
             VerticalOptions="CenterAndExpand" HorizontalOptions="FillAndExpand">
    <ListView.ItemTemplate>
        <DataTemplate>
            <ViewCell>
                <Label TextColor="Black" Margin="10,0" Text="{Binding PlatformName}" BackgroundColor="{Binding Background}" VerticalOptions="Center" />
            </ViewCell>
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

private void contactList_ItemTapped(object sender, ItemTappedEventArgs e)
{
    var selectedItem = e.Item as PlatformInfo;
    selectedItem.ItemBackground = Color.Aqua;

    foreach(var item in this.contactList.ItemsSource)
    {
        if (item != selectedItem)
            (item as PlatformInfo).ItemBackground = Color.Transparent;
    }
}