Xaml 表单：如何在2个滚动布局上方和之间定位圆形图像_Xaml_User Interface_Xamarin.forms_Scrollview_Frame

Xaml 表单：如何在2个滚动布局上方和之间定位圆形图像
xaml user-interface xamarin.forms
Xaml 表单：如何在2个滚动布局上方和之间定位圆形图像,xaml,user-interface,xamarin.forms,scrollview,frame,Xaml,User Interface,Xamarin.forms,Scrollview,Frame,我使用的是一个Xamarin.Forms应用程序，其中包含一个主页，基于：屏幕顶部背景的图像在滚动视图中显示的项目列表如果列表包含许多信息，则滚动视图可以恢复图像这看起来像这样： <Grid RowSpacing="0" BackgroundColor="{StaticResource Gray-050}"> <Grid.RowDefinitions> <RowDefinit
我使用的是一个Xamarin.Forms应用程序，其中包含一个主页，基于：
屏幕顶部背景的
```
图像
```
在
```
滚动视图中显示的项目列表
```

如果列表包含许多信息，则滚动视图
可以恢复图像

这看起来像这样：
<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="16,16,0,0"
                                       Padding="0,10,0,0"
                                       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>


XAML如下所示：
<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="16,16,0,0"
                                       Padding="0,10,0,0"
                                       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>



我想在两个滚动视图
之间显示一个圆形徽标，就在主容器
上方，类似这样：
<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="16,16,0,0"
                                       Padding="0,10,0,0"
                                       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>


但我还没有做到这一点，我也不知道是否有可能…
你可以尝试一下
下面是类似的示例代码：
<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="0,10,0,0"
                                    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, ElementName=MainFrame, Property=Y,Constant=-20}"
                                RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToView, ElementName=MainFrame,  Constant=100}"
                                RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToView, ElementName=MainFrame, Constant=100}" />
                </RelativeLayout>
            </Grid>
        </Grid>
</ScrollView>



其效果是：
您可以尝试一下
下面是类似的示例代码：
<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="0,10,0,0"
                                    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, ElementName=MainFrame, Property=Y,Constant=-20}"
                                RelativeLayout.WidthConstraint="{ConstraintExpression Type=RelativeToView, ElementName=MainFrame,  Constant=100}"
                                RelativeLayout.HeightConstraint="{ConstraintExpression Type=RelativeToView, ElementName=MainFrame, Constant=100}" />
                </RelativeLayout>
            </Grid>
        </Grid>
</ScrollView>



其效果是：
在容器的同一层添加圆形徽标
                <!--  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,-40,0,0"
                                BackgroundColor="Green"
                                CornerRadius="40"
                                HeightRequest="40"
                                HorizontalOptions="Center"
                                VerticalOptions="Start"
                                WidthRequest="40" />
                        </Grid>
                    </Grid>
                </ScrollView>




查看演示：

因为我没有使用nugget包，所以我只是用一个框架替换了pancake视图。您可以根据需要调整徽标大小、边距
顺便说一句，您的结构有点复杂或冗余，可以是4级主结构，如下所示：
<Grid x:Name="mainGrid">

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

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

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

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

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

在容器的同一层添加圆形徽标
                <!--  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,-40,0,0"
                                BackgroundColor="Green"
                                CornerRadius="40"
                                HeightRequest="40"
                                HorizontalOptions="Center"
                                VerticalOptions="Start"
                                WidthRequest="40" />
                        </Grid>
                    </Grid>
                </ScrollView>




查看演示：

因为我没有使用nugget包，所以我只是用一个框架替换了pancake视图。您可以根据需要调整徽标大小、边距
顺便说一句，您的结构有点复杂或冗余，可以是4级主结构，如下所示：
<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
有两种解决方案：带有或不带相对值

没有RelativeLayout
的版本由@Shaw给出
<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="0,10,0,0"
                            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,-45,0,0" />
                </Grid>
            </Grid>
        </ScrollView>
    </Grid>
</Grid>

谢谢@Shaw和@Junior Jiang-MSFT
有两种解决方案：带有或不带相对值

没有RelativeLayout
的版本由@Shaw给出
<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="0,10,0,0"
                            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,-45,0,0" />
                </Grid>
            </Grid>
        </ScrollView>
    </Grid>
</Grid>

你是想把circ