c# - Xamarin.Forms.CarouselView 在 iOS 上不起作用

Question

我尝试在 Visual Studio 中使用 Xamarin.Forms 实现 Xamarin.Forms.CarouselView 以在 iOS 和 Android 上使用。它在 Android 中完美运行，但在 iOS 上不起作用。在 iOS 上它显示第一张幻灯片，但它不允许我向右或向左滑动以更改当前幻灯片。我已经在 iOS 和 Android 项目中安装了 NuGet 包。 XAML 如下所示:

    <cv:CarouselView ItemsSource="{Binding Slider}" x:Name="CarouselSlider">
        <cv:CarouselView.ItemTemplate>
            <DataTemplate>
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="*"/>
                        <!--<RowDefinition Height="Auto"/>-->
                    </Grid.RowDefinitions>
                    <Image Grid.RowSpan="1" Aspect="AspectFill" Source="{Binding ImageUrl}" />
                    <StackLayout BackgroundColor="#7F000000" Padding="12" VerticalOptions="Center" TranslationY="100">
                        <Label TextColor="White" Text="{Binding Title}" FontSize="26" HorizontalOptions="Center" VerticalOptions="CenterAndExpand"/>
                        <Label TextColor="White" Text="{Binding TextBody}" FontSize="16" HorizontalOptions="Center" HorizontalTextAlignment="Center" VerticalOptions="CenterAndExpand"/>
                    </StackLayout>
                </Grid>
            </DataTemplate>
        </cv:CarouselView.ItemTemplate>
    </cv:CarouselView>

后端看起来像这样:

public partial class MainPage : ContentPage
{
    public System.Collections.ObjectModel.ObservableCollection<SliderContent> Slider { get; set; }

    public MainPage()
    {
        InitializeComponent();
        NavigationPage.SetHasNavigationBar(this, false);

        Slider = new System.Collections.ObjectModel.ObservableCollection<SliderContent>
        {
            new SliderContent
            {
                Id = 1,
                ImageUrl = "https://thumb9.shutterstock.com/display_pic_with_logo/1975943/561919966/stock-photo-brutal-strong-athletic-men-pumping-up-muscles-workout-bodybuilding-concept-background-muscular-561919966.jpg",
                Title = "Aliquam et neque arcu",
                TextBody = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc porttitor erat arcu, vitae accumsan odio iaculis et."
            },
                new SliderContent
            {
                Id = 2,
                ImageUrl = "https://ifitlife.files.wordpress.com/2014/06/20140604-155437-57277345.jpg",
                Title = "Donec lobortis sodales dui",
                TextBody = "Morbi congue scelerisque vulputate. Vestibulum sit amet hendrerit justo. Nulla facilisi."
                },
            new SliderContent
            {
                Id = 3,
                ImageUrl = "https://uproxx.files.wordpress.com/2013/05/dmx-black.jpg?quality=100&w=650",
                Title = "Vestibulum arcu elit",
                TextBody = "Aliquam in maximus ante. Suspendisse facilisis posuere nulla quis hendrerit. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas."
            }
        };

        Grid dotsGrid = DotsIndicator;
        dotsGrid.HorizontalOptions = LayoutOptions.CenterAndExpand;

        dotsGrid.ColumnDefinitions = new ColumnDefinitionCollection
        {
            new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) },
            new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) },
            new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) }
        };

        dotsGrid.RowDefinitions = new RowDefinitionCollection
        {
            new RowDefinition { Height = new GridLength(6, GridUnitType.Star) },
            new RowDefinition { Height = new GridLength(2, GridUnitType.Star) },
            new RowDefinition { Height = new GridLength(6, GridUnitType.Star) }
        };

        int counter = 0;

        foreach (var i in Slider)
        {
            Button label = new Button();
            if (Slider.First() == i)
            {
                label = new Button
                {
                    BackgroundColor = Color.White,
                    BindingContext = i,
                    VerticalOptions = LayoutOptions.Fill,
                    WidthRequest = 20,
                    HeightRequest = 20,
                    BorderRadius = 30
                };
            }
            else
            {
                label = new Button
                {
                    BackgroundColor = Color.Gray,
                    BindingContext = i,
                    VerticalOptions = LayoutOptions.Fill,
                    WidthRequest = 20,
                    HeightRequest = 20,
                    BorderRadius = 30
                };
            }

            dotsGrid.Children.Add(label, counter, 1);
            counter++;
        }

        DotsIndicator = dotsGrid;
        this.BindingContext = this;
        CarouselSlider.ItemSelected += CarouselSlider_ItemSelected;
    }

    private void CarouselSlider_ItemSelected(object sender, SelectedItemChangedEventArgs e)
    {
        var item = e.SelectedItem as SliderContent;
        foreach (var i in DotsIndicator.Children)
        {
            i.BackgroundColor = Color.Gray;
            if (i.BindingContext == item)
            {
                i.BackgroundColor = Color.White;
            }
        }

        return;
    }
}

在 iOS 上使用 Xamarin.Forms.CarouselView 是否存在任何已知问题，或者我是否遗漏了什么？

Answer 1

我通过在 CarouselView 周围放置一个 StackLayout 标签解决了这个问题。