在Xamarin.Forms上叠加标签,列表和图像顶部的按钮

Question

我想创建一个页面,其中有一张图片,基本上是图片顶部页面上的其他内容.

类似的东西

XAML代码如:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
         xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
         x:Class="Project.Page">
<ScrollView>
    <AbsoluteLayout>
        <Image Source="{Binding ContentImage}}"  Aspect="AspectFill" AbsoluteLayout.LayoutFlags="All" AbsoluteLayout.LayoutBounds="0,0,1,1"/>
        <Label Text="{Binding label}" FontSize="15" AbsoluteLayout.LayoutFlags="PositionProportional" AbsoluteLayout.LayoutBounds="0,1,-1,-1" />
    </AbsoluteLayout>

</ScrollView>

到目前为止我有这个.但是这只有右下方的标签方式,我似乎无法使列表或按钮正常工作.我想也许只是将图像作为背景,但是图像应该通过按下按钮或其他东西来改变,我不完全确定你是否可以用背景图像来做.

Xamarin.Forms是否可以这样？

对不起,如果我的英语很差!这是我的第二语言!

提前致谢!

编辑:我能够使用图像作为背景,并通过单击按钮进行更改.现在我只需要了解如何实际定位ListView.

Answer 1

我从一个演示中移动了一些项目,这只是使用AbsoluteLayout和Grid处理它的一种方法

<AbsoluteLayout x:Name="ViewLayout">
    <Image Source="coffee.png" Aspect="AspectFill" AbsoluteLayout.LayoutBounds="1,1,1,1" AbsoluteLayout.LayoutFlags="All" />
    <AbsoluteLayout x:Name="ViewControls" AbsoluteLayout.LayoutBounds="1,1,1,.50" AbsoluteLayout.LayoutFlags="All" BackgroundColor="#66000000" Margin="10,10,10,10">
        <StackLayout Orientation="Vertical" Margin="20,20,20,20" BackgroundColor="Transparent" AbsoluteLayout.LayoutFlags="All" AbsoluteLayout.LayoutBounds="1,1,1,1">
            <Grid Margin="1">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Label Text="Salted Caramel Mocha Frappuccino" TextColor="White" HorizontalOptions="CenterAndExpand" VerticalTextAlignment="Center" Grid.Column="0" Grid.ColumnSpan="3" Grid.RowSpan="2" />
                <Button Text="Extra Shot" BackgroundColor="#77000000" BorderRadius="4" BorderColor="White" BorderWidth="2" TextColor="White" Grid.Row="0" Grid.Column="3" />
                <Button Text="Whipped Cream" BackgroundColor="#77000000" BorderRadius="4" BorderColor="White" BorderWidth="2" TextColor="White" Grid.Row="1" Grid.Column="3" />
            </Grid>
            <Grid Margin="1">
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto" />
                </Grid.RowDefinitions>
                <Button Text="Tall (12oz)" BackgroundColor="#77000000" BorderRadius="4" BorderColor="White" BorderWidth="2" TextColor="White" HorizontalOptions="FillAndExpand" Grid.Column="0" />
                <Button Text="Grande (16oz)" BackgroundColor="#77000000" BorderRadius="4" BorderColor="White" BorderWidth="2" TextColor="White" HorizontalOptions="FillAndExpand" Grid.Column="1" />
                <Button Text="Venti (20oz)" BackgroundColor="#77000000" BorderRadius="4" BorderColor="White" BorderWidth="2" TextColor="White" HorizontalOptions="FillAndExpand" Grid.Column="2" />
            </Grid>
        </StackLayout>
    </AbsoluteLayout>
</AbsoluteLayout>