如何在Xamarin.Forms中启用Grid中的边框

Question

我在Xamarin.Forms中构建一个网格.而且我想添加像桌子这样的边框.我认为我可以在定义行和列时添加边框,但是失败了.谁能帮我？这是我目前的代码.

Grid grid = new Grid {
    VerticalOptions = LayoutOptions.FillAndExpand,
    RowDefinitions = {
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },
        new RowDefinition { Height = GridLength.Auto },

    },
    ColumnDefinitions = {
        new ColumnDefinition { Width = new GridLength (1, GridUnitType.Star) },
        new ColumnDefinition { Width = new GridLength (5, GridUnitType.Star) },
        new ColumnDefinition { Width = new GridLength (1, GridUnitType.Star) },
    }
};

Answer 1

没有Border财产GridView,但是:

只需设置grid.BackgroundColor所需的边框颜色值,然后设置grid.ColumnSpacing并设置grid.RowSpacing为某个值,并确保添加到网格中的所有控件都已BackgroundColor正确设置.

Answer 2

这是完整的答案(在XAML中),无需编写自定义渲染器或效果.

代码有点冗长但易于理解,结果就像在图像上一样

这是将边框放在网格上的代码(更多的是你可以完全控制它们,就像你注意到最左边没有蓝线)

<Grid BackgroundColor="White">
  <Grid.RowDefinitions>
    <RowDefinition Height="1"/>
    <RowDefinition Height="15"/>
    <RowDefinition Height="1"/>
    <RowDefinition Height="15"/>
    <RowDefinition Height="1"/>
    <RowDefinition Height="15"/>
    <RowDefinition Height="1"/>
  </Grid.RowDefinitions>
  <Grid.ColumnDefinitions>
    <ColumnDefinition Width="Auto"  />
    <ColumnDefinition Width="1" />
    <ColumnDefinition Width="10" />
    <ColumnDefinition Width="1" />
    <ColumnDefinition Width="*" />
    <ColumnDefinition Width="1" />
    <ColumnDefinition Width="50" />
    <ColumnDefinition Width="1" />
  </Grid.ColumnDefinitions>
  <BoxView Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="8" BackgroundColor="Red" HeightRequest="1" VerticalOptions="End" HorizontalOptions="FillAndExpand"/>
  <!--Your stuff here!-->
  <BoxView Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="8" BackgroundColor="Red" HeightRequest="1" VerticalOptions="End"  HorizontalOptions="FillAndExpand"/>
   <!--Your stuff here!-->
  <BoxView Grid.Row="4" Grid.Column="0" Grid.ColumnSpan="8" BackgroundColor="Red" HeightRequest="1" VerticalOptions="End"  HorizontalOptions="FillAndExpand"/>
   <!--Your stuff here!-->
  <BoxView Grid.Row="6" Grid.Column="0" Grid.ColumnSpan="8" BackgroundColor="Red" HeightRequest="1" VerticalOptions="End"  HorizontalOptions="FillAndExpand"/>

  <!--Vertical lines and no "stuff"-->
  <BoxView Grid.Column="1" Grid.Row="0" Grid.RowSpan="7"  BackgroundColor="Blue" WidthRequest="1" VerticalOptions="FillAndExpand" HorizontalOptions="End"/>
  <BoxView Grid.Column="3" Grid.Row="0" Grid.RowSpan="7"  BackgroundColor="Blue" WidthRequest="1" VerticalOptions="FillAndExpand" HorizontalOptions="End"/>
  <BoxView Grid.Column="5" Grid.Row="0" Grid.RowSpan="7"  BackgroundColor="Blue" WidthRequest="1" VerticalOptions="FillAndExpand" HorizontalOptions="End"/>
  <BoxView Grid.Column="7" Grid.Row="0" Grid.RowSpan="7"  BackgroundColor="Blue" WidthRequest="1" VerticalOptions="FillAndExpand" HorizontalOptions="End"/>
</Grid>

Answer 3

  <Grid BackgroundColor="White" >
        <BoxView BackgroundColor="Pink"  />
        <Grid BackgroundColor="White" Margin="5">

        </Grid>
    </Grid>

Answer 4

刚刚注意到我的例子类似于Sturla,但有点不同所以我会把它留下来.

代码并不是非常漂亮,但我做了类似的事情,BoxView在每列之间添加了1px ,然后在你Grid的底部添加1个,在你的底部添加1个Grid,如下所示:

<Grid VerticalOptions="FillAndExpand"
      HorizontalOptions="FillAndExpand"
      RowSpacing="0"
      ColumnSpacing="0">

  <Grid.ColumnDefinitions>
    <ColumnDefinition Width="*"/>
  </Grid.ColumnDefinitions>

  <Grid.RowDefinitions>
    <RowDefinition Height="1"/>
    <RowDefinition Height="Auto"/>
    <RowDefinition Height="1"/>
  </Grid.RowDefinitions>

  <BoxView BackgroundColor="Black"
           HeightRequest="1"
           HorizontalOptions="FillAndExpand"
           Grid.Row="0"/>

  <Grid VerticalOptions="Start"
        ColumnSpacing="0"
        Grid.Row="1">

    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="*"/>
      <ColumnDefinition Width="1"/>
      <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>

    <Grid.RowDefinitions>
      <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>

    <Button Text="Button 1"/>

    <BoxView BackgroundColor="Black"
             WidthRequest="1"
             VerticalOptions="FillAndExpand"
             Grid.Column="1"/>

    <Button Text="Button 1"
            Grid.Column="2"/>
  </Grid>

  <BoxView BackgroundColor="Black"
           HeightRequest="1"
           HorizontalOptions="FillAndExpand"
           Grid.Row="2"/>
</Grid>

*编辑:自写这篇文章以来,我改变了我的方式.现在,就像Daniel Luberda的回答一样,我只需设置Grid.BackgroundColor为Color.Black,然后我就可以删除所有BoxViews并完成了.我这样做是因为我认为在屏幕上显示几个视图要好得多,特别是如果你在上面放一些类似的东西ListView.

此外,由于很多页面会Button在页面加载(使用ScaleTo())时为s 设置动画,我最初设置Grid.BackgroundColor为Color.Transparent或者Color.White动画完成后再将其更改为Color.Black.到目前为止工作得很好.