xamarin.forms - Xamarin 中的砌体列表样式

Question

我需要像砖石风格（https://halcyon-theme.tumblr.com/）一样在内容页面上列出公告，但我无法成功。我的问题是，当我使用 Parent Stacklayout 的垂直对齐选项设置为 FillAndExpand 时，Scrollview 没有覆盖整个页面。但是如果我将 Scrollview 和 Parent StackLayout 设置为静态高度值，没关系，但由于每个项目的高度会改变，我不能像你猜的那样使用它。

                <StackLayout x:Name="stckParent" Orientation="Vertical" VerticalOptions="FillAndExpand">
                    <Grid VerticalOptions="FillAndExpand" RowSpacing="0" ColumnSpacing="0">
                        <Grid.ColumnDefinitions>
                            <ColumnDefinition Width="*"/>
                            <ColumnDefinition Width="*"/>
                        </Grid.ColumnDefinitions>
                        <Grid.RowDefinitions>
                            <RowDefinition Height="auto"/>
                        </Grid.RowDefinitions>

                        <StackLayout x:Name="stckLeft" Grid.Column="0" Margin="0,0,2,0"
                                  Orientation="Vertical" VerticalOptions="FillAndExpand">
                        </StackLayout>

                        <StackLayout x:Name="stckRight" Grid.Column="1" Margin="2,0,0,0"
                                  Orientation="Vertical" VerticalOptions="FillAndExpand">
                        </StackLayout>

                    </Grid>
                </StackLayout>

            </ScrollView>

public MainPage()
        {
            InitializeComponent();

            var list = new ObservableCollection<Announcement>
            {
                new Announcement
                {
                    ID = 1,
                    Title = "Yedek parça siparişlerinizde %22' ye varan indirim!",
                    ImagePath = "https://image5.sahibinden.com/photos/08/54/18/x5_719085418j7p.jpg",
                    IsActive = true,
                    CreateDate = DateTime.Now,
                },
                new Announcement
                {
                    ID = 2,
                    Title = "Fren Balataları Hangi Sıklıkla Değiştirilmelidir?",
                    ImagePath = "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcTJzQfduSrJ3Nh7SHzGSGrCmTnWses4AcfuRSnU7hX4y9XN4TSU&usqp=CAU",
                    IsActive = true,
                    CreateDate = DateTime.Now,
                }
            };

            DeviceHelper helper = DependencyService.Get<IDeviceHelper>().GetDevice();

            double height = 0;

            for (int m = 0; m < 6; m++)
            {
                for (int i = 0; i < list.Count; i++)
                {

                    Frame frame = new Frame
                    {
                        Padding = new Thickness(0, 0, 0, 0)
                    };

                    // Stack
                    StackLayout stack = new StackLayout
                    {
                        Margin = new Thickness(10),
                    };

                    // Image
                    Image image = new Image
                    {
                        Source = list[i].ImagePath,
                        HorizontalOptions = LayoutOptions.FillAndExpand,
                        VerticalOptions = LayoutOptions.FillAndExpand
                    };

                    // Title
                    Label title = new Label
                    {
                        Text = list[i].Title,
                        Margin = new Thickness(0, 6, 0, 0),
                        FontSize = 13
                    };

                    // Date
                    Label date = new Label
                    {
                        Text = list[i].CreateDate.ToString().Substring(0, 10), // temporary workaround
                        Margin = new Thickness(0, 6, 0, 0),
                        TextColor = Color.Gray,
                        FontSize = 11
                    };

                    stack.Children.Add(image);
                    stack.Children.Add(title);
                    stack.Children.Add(date);

                    frame.Content = stack;


                    if (i % 2 == 0)
                    {
                        stckLeft.Children.Add(frame);
                    }
                    else
                    {
                        stckRight.Children.Add(frame);

                        SizeRequest columnSizeRequest = frame.Measure(600, 800);
                        height += columnSizeRequest.Request.Height * 6;
                    }
                }
            }
            stckLeft.HeightRequest = height;
            stckRight.HeightRequest = height;

            scrList.HeightRequest = helper.ScreenHeight - 100;

        }

为什么 Scrollview 不能填满整个页面？能够做砖石风格页面的最佳实践是什么？如何获得刚刚绑定的帧大小？{

SizeRequest columnSizeRequest = frame.Measure(300, 400); // 结果总是41，没有意义..
height += columnSizeRequest.Request.Height * 6;

}

除了估计的高度值，还不错:)

GitHub链接； https://github.com/Erdogan34/Test-Masonry

================= 更新 =================

弹性布局；如何将绿色框设置为顶部？

<FlexLayout Direction="Row" Wrap="Wrap" AlignContent="Start"
                                JustifyContent="Start" AlignItems="Start">

                        <Frame BackgroundColor="Red" Margin="4,4">
                            <StackLayout WidthRequest="140">
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                            </StackLayout>
                        </Frame>

                        <Frame BackgroundColor="Blue" Margin="4,4">
                             <StackLayout WidthRequest="140">
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                            </StackLayout>
                        </Frame>

                        <Frame BackgroundColor="Green" Margin="4,4" FlexLayout.Grow="1">
                             <StackLayout WidthRequest="140">
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                            </StackLayout>
                        </Frame>

                        <Frame BackgroundColor="Yellow" Margin="4,4" FlexLayout.Grow="1">
                             <StackLayout WidthRequest="140">
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                                <Label Margin="0,10" Text="Deneme"/>
                            </StackLayout>
                        </Frame>

    </FlexLayout>