如何在 Xamarin.Forms 中制作方形按钮网格？答案

【问题标题】：How to make square buttons grid in Xamarin.Forms?如何在 Xamarin.Forms 中制作方形按钮网格？
【发布时间】：2019-05-06 22:28:37
【问题描述】：

我正在尝试创建一个类似于我为 Android 创建的活动的 Xamarin.Forms 内容页面：

所以基本上我想要一个方形按钮网格，我可以通过添加更多行轻松扩展它。我的内容页面看起来像这样（到目前为止只有 1 行）：

<?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="TravelGuide.MainPage">
    <ContentPage.Content>
        <ScrollView>
            <Grid x:Name="MainGrid">
                <Grid.RowDefinitions>
                    <RowDefinition Height="auto" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
            <Button Text="Text..."
            x:Name="btn1"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
            HeightRequest="{Binding Width, Source={x:Reference btn1}}"
            Grid.Row="0"
            Grid.Column="0"/>

            <Button Text="Text2..."
            x:Name="btn2"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
            HeightRequest="{Binding Width, Source={x:Reference btn2}}"
            Grid.Row="0"
            Grid.Column="1"/>

            <Button Text="Text3..."
             x:Name="btn3"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
            HeightRequest="{Binding Width, Source={x:Reference btn3}}"
            Grid.Row="0"
            Grid.Column="2"/>
        </Grid>
    </ScrollView>
</ContentPage.Content>

我快到了，但按钮会根据它们的文本长度调整大小，我想防止这种情况发生 - 所有按钮的大小都应该相同。该怎么做？

【问题讨论】：

现在可以用了吗？

标签： c# xaml xamarin grid

【解决方案1】：

既然你已经设置了

<ColumnDefinition Width="*" />

当你有 3 列时，每列的宽度将设置为屏幕宽度的 1/3。

<ScrollView>
        <Grid x:Name="MainGrid">
            <Grid.RowDefinitions>
                <RowDefinition Height="auto" />
                <RowDefinition Height="auto" />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="0.33*" />
                <ColumnDefinition Width="0.33*" />
                <ColumnDefinition Width="0.33*" />
            </Grid.ColumnDefinitions>
            <Button Text="aaaaaaaaaaaaaaaaaa"
            x:Name="btn1"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
            HeightRequest="{Binding Width, Source={x:Reference btn1}}"
            Grid.Row="0"
            Grid.Column="0"/>

            <Button Text="Text2..."
            x:Name="btn2"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
            WidthRequest="{Binding Width, Source={x:Reference btn1}}"
            HeightRequest="{Binding Width, Source={x:Reference btn2}}"
            Grid.Row="0"
            Grid.Column="1"/>

            <Button Text="Text3..."
             x:Name="btn3"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
            WidthRequest="{Binding Width, Source={x:Reference btn1}}"
            HeightRequest="{Binding Width, Source={x:Reference btn3}}"
            Grid.Row="0"
            Grid.Column="2"/>

            <Button Text="aaaaaaaaaaaaaaaaa"
            x:Name="btn4"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
                    WidthRequest="{Binding Width, Source={x:Reference btn1}}"
            HeightRequest="{Binding Width, Source={x:Reference btn4}}"
            Grid.Row="1"
            Grid.Column="0"/>

            <Button Text="Text5..."
            x:Name="btn5"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
                    WidthRequest="{Binding Width, Source={x:Reference btn1}}"
            HeightRequest="{Binding Width, Source={x:Reference btn5}}"
            Grid.Row="1"
            Grid.Column="1"/>

            <Button Text="Text6..."
             x:Name="btn6"
            VerticalOptions="CenterAndExpand"
            HorizontalOptions="Center"
                    WidthRequest="{Binding Width, Source={x:Reference btn1}}"
            HeightRequest="{Binding Width, Source={x:Reference btn6}}"
            Grid.Row="1"
            Grid.Column="2"/>

        </Grid>
    </ScrollView>

【讨论】：

【解决方案2】：

我最终成功了，解决方案是将按钮的水平选项更改为填充：

<?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="TravelGuide.MainPage">
    <ContentPage.Content>
        <ScrollView Padding="5">
            <Grid x:Name="MainGrid">
                <Grid.RowDefinitions>
                    <RowDefinition Height="auto" />
                    <RowDefinition Height="auto" />
                </Grid.RowDefinitions>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Button Text="Text..."
                x:Name="btn1"
                VerticalOptions="CenterAndExpand"
                HorizontalOptions="Fill"
                HeightRequest="{Binding Width, Source={x:Reference btn1}}"
                Grid.Row="0"
                Grid.Column="0"/>

                <Button Text="Text2..."
                x:Name="btn2"
                VerticalOptions="CenterAndExpand"
                HorizontalOptions="Fill"
                HeightRequest="{Binding Width, Source={x:Reference btn2}}"
                Grid.Row="0"
                Grid.Column="1"/>

                <Button Text="Text3..."
                 x:Name="btn3"
                VerticalOptions="CenterAndExpand"
                HorizontalOptions="Fill"
                HeightRequest="{Binding Width, Source={x:Reference btn3}}"
                Grid.Row="0"
                Grid.Column="2"/>

                <Button Text="Text3222222..."
                 x:Name="btn4"
                VerticalOptions="CenterAndExpand"
                HorizontalOptions="Fill"
                HeightRequest="{Binding Width, Source={x:Reference btn3}}"
                Grid.Row="1"
                Grid.Column="0"/>
            </Grid>
        </ScrollView>
    </ContentPage.Content>
</ContentPage>

另一种方法是按照上面的@Lucas Zhang - MSFT 说明进行操作。

【讨论】：