Xamarin.Forms：如何在2 ScrollLayout上方和之间放置圆形图像

分类：编程问答

如何解决Xamarin.Forms：如何在2 ScrollLayout上方和之间放置圆形图像

我使用的是 Xamarin.Forms应用，该应用包含基于以下内容的首页：

  • 位于屏幕顶部背景的Image
  • 在ScrollView
    • 中显示的项目列表

如果列表包含许多信息，则ScrollView可以恢复Image。

这看起来像这样：

Video

XAML看起来像这样：

<Grid RowSpacing="0"
        BackgroundColor="{StaticResource Gray-050}">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Grid Grid.Row="1">
        <!--  Header view  -->
        <ScrollView>
            <ContentView x:Name="headerView"
                         HorizontalOptions="FillAndExpand"
                         VerticalOptions="FillAndExpand">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                    </Grid.RowDefinitions>
                    <!-- the BoxView will be replaced by an Image -->
                    <BoxView x:Name="headerImage"
                                HeightRequest="280"
                                BackgroundColor="Yellow" />
                </Grid>
            </ContentView>
        </ScrollView>

        <!--  List view  -->
        <ScrollView HorizontalOptions="FillAndExpand"
                    VerticalOptions="FillAndExpand">
            <Grid ColumnSpacing="0"
                  RowSpacing="0"
                  VerticalOptions="FillAndExpand">
                <Grid.RowDefinitions>
                    <RowDefinition Height="140" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <Grid Grid.Row="1">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="*" />
                    </Grid.RowDefinitions>
                    <!-- Main container -->
                    <yummy:PancakeView CornerRadius="16,16,0"
                                       Padding="0,10,0"
                                       BackgroundColor="{StaticResource Gray-050}"
                                       Grid.Row="1">
                        <StackLayout BackgroundColor="Transparent"
                                     Spacing="16" Margin="16">

                            <!-- Phone container -->
                            <yummy:PancakeView Style="{StaticResource YummyHomeFrame}"
                                                Padding="16">
                                <Grid RowSpacing="0">
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="*" />
                                        <RowDefinition Height="*" />
                                    </Grid.RowDefinitions>
                                    <Label Style="{StaticResource HomePageHeaderLabelStyle}"
                                            Text="Phone Number" />
                                    <Label Grid.Row="1"
                                            Style="{StaticResource HomePageLabelStyle}"
                                            Text="+33 6 20 10 70 40"  />
                                </Grid>
                            </yummy:PancakeView>

                            <!-- Other containers -->

                        </StackLayout>
                    </yummy:PancakeView>
                </Grid>
            </Grid>
        </ScrollView>
    </Grid>
</Grid>

我想在ScrollViews上方的两个MainContainer之间显示一个圆圈徽标，如下所示：

Expected rendering

但是我还没有成功实现这一目标，我也不知道这是否有可能...

解决方法

您可以尝试使用RelativeLayout来实现。

这是类似的示例代码：

<ScrollView HorizontalOptions="FillAndExpand"
                VerticalOptions="FillAndExpand">
        <Grid ColumnSpacing="0"
                RowSpacing="0"
                VerticalOptions="FillAndExpand">
            <Grid.RowDefinitions>
                <RowDefinition Height="140" />
                <RowDefinition Height="Auto" />
                <RowDefinition Height="*" />
            </Grid.RowDefinitions>
            <Grid Grid.Row="1">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <!-- Main container -->
                <RelativeLayout>
                    <Frame CornerRadius="16" x:Name="MainFrame"
                                    Padding="0,10,0"
                                    BackgroundColor="LightBlue"
                                    Grid.Row="1">
                    <StackLayout BackgroundColor="Transparent"
                                    Spacing="16"
                                    Margin="16">

                        <!-- Phone container -->
                        <Frame Padding="16">
                            <Grid RowSpacing="0">
                                <Grid.RowDefinitions>
                                    <RowDefinition Height="*" />
                                    <RowDefinition Height="*" />
                                </Grid.RowDefinitions>
                                <Label Text="Phone Number" />
                                <Label Grid.Row="1"
                                        Text="+33 6 20 10 70 40" />
                            </Grid>
                        </Frame>

                        <!-- Other containers -->

                    </StackLayout>
                </Frame>
                    <BoxView CornerRadius="25"
                                BackgroundColor="AliceBlue"
                                RelativeLayout.XConstraint="{ConstraintExpression Type=RelativeToView,ElementName=MainFrame,Property=Width,Factor=0.45}"
                                RelativeLayout.YConstraint="{ConstraintExpression Type=RelativeToView,Property=Y,Constant=-20}"
                                RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToView,Constant=100}"
                                RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToView,Constant=100}" />
                </RelativeLayout>
            </Grid>
        </Grid>
</ScrollView>

效果：

enter image description here

,

在容器的同一位置添加圆圈徽标。

                <!--  Items view  -->
                <ScrollView HorizontalOptions="FillAndExpand" VerticalOptions="FillAndExpand">
                    <Grid
                        ColumnSpacing="0"
                        RowSpacing="0"
                        VerticalOptions="FillAndExpand">
                        <Grid.RowDefinitions>
                            <RowDefinition Height="140" />
                            <RowDefinition Height="Auto" />
                            <RowDefinition Height="*" />
                        </Grid.RowDefinitions>
                        <Grid Grid.Row="1">
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto" />
                                <RowDefinition Height="*" />
                            </Grid.RowDefinitions>

                            <!--  Container  -->
                            <Frame ...>

                            <!--  Yoour logo -->
                            <Frame
                                Grid.Row="1"
                                Margin="0,-40,0"
                                BackgroundColor="Green"
                                CornerRadius="40"
                                HeightRequest="40"
                                HorizontalOptions="Center"
                                VerticalOptions="Start"
                                WidthRequest="40" />
                        </Grid>
                    </Grid>
                </ScrollView>

Add logo around line 195

查看演示

demo

由于我没有使用块状软件包，所以我只用框架替换了煎饼视图。您可以根据需要调整徽标大小和边距。

顺便说一句，您的结构有点复杂或多余，可以是如下所示的4级主要结构：

<Grid x:Name="mainGrid">

  <!--  Header view  -->
  <BoxView (or Image).../>

  <!--  Items view  -->
  <ScrollView ...>
    <Grid ...>

      <!--  Container  -->
      <Frame ...>

      <!--  logo  -->
      <Frame (or Image)...>

    </Grid>
  </ScrollView>
</Grid>
,

谢谢@Shaw和@Junior Jiang-MSFT

有 2个解决方案：有或无 RelativeLayout。

由@Shaw给出的版本无 RelativeLayout。

<Grid RowSpacing="0"
        BackgroundColor="LightGray"
        x:Name="mainGrid">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Grid Grid.Row="1">
        <!--  Header view  -->
        <ScrollView>
            <ContentView x:Name="headerView"
                            HorizontalOptions="FillAndExpand"
                            VerticalOptions="FillAndExpand">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                    </Grid.RowDefinitions>
                    <!-- the BoxView can be replaced by an Image -->
                    <BoxView x:Name="headerImage"
                                HeightRequest="280"
                                BackgroundColor="Yellow" />
                </Grid>
            </ContentView>
        </ScrollView>
            <!-- Content View -->
        <ScrollView HorizontalOptions="FillAndExpand"
                    VerticalOptions="FillAndExpand">
            <Grid ColumnSpacing="0"
                    RowSpacing="0"
                    VerticalOptions="FillAndExpand">
                <Grid.RowDefinitions>
                    <RowDefinition Height="140" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <Grid Grid.Row="1">
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                        <RowDefinition Height="*" />
                    </Grid.RowDefinitions>
                    <!-- Frame Container-->
                    <Frame x:Name="MainFrame"
                            CornerRadius="16"
                            Padding="0,0"
                            BackgroundColor="LightGray"
                            Grid.Row="1">
                        <StackLayout BackgroundColor="Transparent"
                                        Spacing="16" Margin="16,48,16,16">
                            <!-- Phone Frame -->
                            <Frame Padding="16">
                                <Grid RowSpacing="0">
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="*" />
                                        <RowDefinition Height="*" />
                                    </Grid.RowDefinitions>
                                    <Label Text="Phone Number" />
                                    <Label Grid.Row="1"
                                            Text="+33 6 20 10 70 40"  />
                                </Grid>
                            </Frame>
                            <!-- Other Frames -->
                            <!-- ... -->
                        </StackLayout>
                    </Frame>
                    <!-- No RelativeLayout positioned item -->
                    <BoxView Grid.Row="1"
                                CornerRadius="45"
                                BackgroundColor="DarkBlue"
                                WidthRequest="90" HeightRequest="90"
                                VerticalOptions="Start" HorizontalOptions="Center"
                                Margin="0,-45,0" />
                </Grid>
            </Grid>
        </ScrollView>
    </Grid>
</Grid>

带有 RelativeLayout的版本基于@Junior Jiang-MSFT建议：

<Grid RowSpacing="0"
        BackgroundColor="LightGray"
        x:Name="mainGrid">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="*" />
    </Grid.RowDefinitions>
    <Grid Grid.Row="1">
        <!--  Header View  -->
        <ScrollView>
            <ContentView x:Name="headerView"
                            HorizontalOptions="FillAndExpand"
                            VerticalOptions="FillAndExpand">
                <Grid>
                    <Grid.RowDefinitions>
                        <RowDefinition Height="Auto" />
                    </Grid.RowDefinitions>
                    <!-- the BoxView can be replaced by an Image -->
                    <BoxView x:Name="headerImage"
                                HeightRequest="280"
                                BackgroundColor="Yellow" />
                </Grid>
            </ContentView>
        </ScrollView>
        <!-- Content View -->
        <ScrollView HorizontalOptions="FillAndExpand"
                    VerticalOptions="FillAndExpand">
            <Grid ColumnSpacing="0"
                    RowSpacing="0"
                    VerticalOptions="FillAndExpand">
                <Grid.RowDefinitions>
                    <RowDefinition Height="140" />
                    <RowDefinition Height="Auto" />
                    <RowDefinition Height="*" />
                </Grid.RowDefinitions>
                <StackLayout Grid.Row="1">
                    <RelativeLayout>
                        <!-- Frame container -->
                        <Frame x:Name="MainFrame"
                                CornerRadius="16"
                                Padding="0,0"
                                BackgroundColor="LightGray"
                                        Grid.Row="1">
                            <StackLayout BackgroundColor="Transparent"
                                        Spacing="16" Margin="16,16">
                                <!-- Phone Frame -->
                                <Frame Padding="16">
                                    <Grid RowSpacing="0">
                                        <Grid.RowDefinitions>
                                            <RowDefinition Height="*" />
                                            <RowDefinition Height="*" />
                                        </Grid.RowDefinitions>
                                        <Label Text="Phone Number" />
                                        <Label Grid.Row="1"
                                            Text="+33 6 20 10 70 40"  />
                                    </Grid>
                                </Frame>
                                <!-- Other Frames -->
                                <!-- ... -->
                            </StackLayout>
                        </Frame>
                        <!-- RelativeLayout positioned item -->
                        <BoxView CornerRadius="45"
                                BackgroundColor="DarkBlue"
                                WidthRequest="90" HeightRequest="90"
                                VerticalOptions="Center" HorizontalOptions="Center"
                                RelativeLayout.XConstraint="{ConstraintExpression 
                                                                Type=RelativeToParent,Factor=0.5,Constant=-45}"
                                RelativeLayout.YConstraint="{ConstraintExpression
                                                                Type=RelativeToView,Constant=-45}" />
                    </RelativeLayout>
                </StackLayout>
            </Grid>
        </ScrollView>
    </Grid>
</Grid>

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