Question

我制作了一个带有框架和标签的网格。但是网格的高度太大。我不知道标签中会有多少个单词。

那么有什么方法可以获取框架或标签的高度？

并且网格始终无法适应框架。

<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition Width="*" />
        <ColumnDefinition Width="6.6*" />
        <ColumnDefinition Width="*" />
    </Grid.ColumnDefinitions>
    <StackLayout Grid.Column="0" VerticalOptions="CenterAndExpand">
        <Image Source="lf.png" />
    </StackLayout>
    <RelativeLayout Grid.Column="1" VerticalOptions="CenterAndExpand">
        <Frame BackgroundColor="#f0f8fa" x:Name="box1" Padding="9,9,20,9"
               HasShadow="false">
            <Label Text="慢性咽炎怎么办？" TextColor="#111111" FontSize="16" />
        </Frame>
        <Image Source="chat_left.png" WidthRequest="6" 
               HeightRequest="7.5" RelativeLayout.XConstraint="{ConstraintExpression 
               Type=RelativeToView,ElementName=box1,Property=X,Factor=0,Constant=-6}" 
               RelativeLayout.YConstraint="{ConstraintExpression 
               Type=RelativeToView,ElementName=box1,Property=Height,
               Factor=0.5,Constant=0}" />
    </RelativeLayout>
    <StackLayout Grid.Column="2">
    </StackLayout>
</Grid>

Answer 1

如果只想让网格适合标签的大小，则只需将行的高度或列的宽度设置为自动 strong>

<Grid>
   <Grid.RowDefinitions>
       <RowDefinition Height="Auto" />
       <RowDefinition Height="Auto" />
   </Grid.RowDefinitions>
   <Grid.ColumnDefinitions>
       <ColumnDefinition Width="*" />
   </Grid.ColumnDefinitions>
   <Label x:Name="label1" BackgroundColor="Red" Text="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" Grid.Row="0"  SizeChanged="Label1_SizeChanged"/>

   <Label x:Name="label2" BackgroundColor="Yellow" Text="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbBBBBBBBBBBBBBBBBBBBbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb" Grid.Row="1" SizeChanged="Label2_SizeChanged" />
</Grid>

如果您想获取标签的高度，则可以通过 SizeChanged

方法获取

后面的代码中

private void Label1_SizeChanged(object sender, EventArgs e)
{
    Label label = (Label)sender;

    DisplayAlert("Title", "the height of label1 is " + label.Height, "cancel");
}

private void Label2_SizeChanged(object sender, EventArgs e)
{
    Label label = (Label)sender;

    DisplayAlert("Title", "the height of label2 is " + label.Height, "cancel");
}

如何获得标签的高度

1 个答案: