用指针建立框架

Question

我想用指针建立一个像下面这样的框架，在这种情况下，是右边的三角形：

这怎么办？

Answer 1

使用BoxView创建两个堆叠的Grid，然后将顶部的旋转45度：

<StackLayout>
    <Grid HorizontalOptions="Center" VerticalOptions="CenterAndExpand" WidthRequest="100" HeightRequest="100">
        <BoxView HorizontalOptions="Center" VerticalOptions="CenterAndExpand" WidthRequest="100" HeightRequest="80" BackgroundColor="Red"/>
        <BoxView HorizontalOptions="End" VerticalOptions="CenterAndExpand" 
                 WidthRequest="50" HeightRequest="50" BackgroundColor="Red" Rotation="45"/>
        <StackLayout VerticalOptions="Center" HorizontalOptions="Center" Spacing="0">
            <Label HorizontalTextAlignment="Center" CharacterSpacing="2" FontSize="13" TextColor="White" Text="DECEMBER"/>
            <Label HorizontalTextAlignment="Center" FontAttributes="Bold" FontSize="22" TextColor="White" Text="25"/>
            <Label HorizontalTextAlignment="Center" CharacterSpacing="2" FontSize="13" TextColor="White" Text="WEDNESDAY"/>
        </StackLayout> 
    </Grid>
</StackLayout>