Xamarin.Forms-在另一个元素上放置元素. [英] Xamarin.Forms - position element on top of another.

问题描述

我的Xamarin.Forms项目中有一个页面，我需要看起来像这样:

I've got a page in my Xamarin.Forms project that I need to look something like this:

我可以放置红色和蓝色框，没问题.但是我不知道如何创建绿色的.

I can position the red and blue boxes, no problem. But I can't figure out how to create the green one.

我使用的XAML如下:

The XAML I use is the following:

<StackLayout HorizontalOptions="FillAndExpand">
    <StackLayout VerticalOptions="FillAndExpand" BackgroundColor="Red">   
         //I'm thinking the green box should be positioned absolutely in here or something?         
    </StackLayout>
    <StackLayout VerticalOptions="End" BackgroundColor="Blue">
        <Grid VerticalOptions="EndAndExpand">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="1*"></ColumnDefinition>
            </Grid.ColumnDefinitions>
            <Button Grid.Column="0" Text="Button" HorizontalOptions="FillAndExpand" BorderRadius="0" VerticalOptions="EndAndExpand" HeightRequest="50" TextColor="White" BackgroundColor="#85C034"></Button>
        </Grid>
    </StackLayout>
</StackLayout>

推荐答案

Grid是实现此行为的最佳布局控件.您可以使用*展开一行以填充，将文本标签嵌套在第一行的内容视图内，然后将第二行设置为所需的高度.

The Grid is the best layout control to implement this behaviour. You can use * to expand a row out to fill, nest the text label inside a content view in the first row and then set the second row to the desired height.

EG:

<?xml version="1.0" encoding="utf-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
    xmlns:local="clr-namespace:Grids"
    x:Class="Grids.GridsPage">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"/>
            <RowDefinition Height="60"/>
        </Grid.RowDefinitions>
        <ContentView 
            BackgroundColor="Red" Grid.Row="0">
            <Label TextColor="Black"
                Text="Text"
                Margin="0,0,0,10"
                BackgroundColor="#00FF02"
                VerticalOptions="End"
                HorizontalOptions="Center"/>
        </ContentView>
        <ContentView BackgroundColor="Blue" Grid.Row="1"/>
    </Grid>
</ContentPage>

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