为何我的按钮设置Style后，图标为空？而新建基本页里，左上角按钮修改Style就显示相应图标

Question

很是奇怪，只有Style为BackButtonStyle时有图标为‘返回箭头’，其他样式都不显示，但系统自动生成的那个Button就可以切换Style，真奇怪

Answer 1

真奇怪。。

Answer 2

XAML代码是怎样的 ？

Answer 3

XAML代码是怎样的 ？

就是很普通的啊，新建一个按钮，设置Style就无法显示 圆圈内的字符，只显示一个圈圈，里面是Button字样。

Answer 4

不奇怪啊，你看了 BackButtonStyle 的内容就知道了 （在Common/StandardStyles.xaml），它里面写死了 这个箭头  

<Style x:Key="BackButtonStyle" TargetType="Button">
        <Setter Property="MinWidth" Value="0"/>
        <Setter Property="Width" Value="48"/>
        <Setter Property="Height" Value="48"/>
        <Setter Property="Margin" Value="36,0,36,36"/>
        <Setter Property="VerticalAlignment" Value="Bottom"/>
        <Setter Property="FontFamily" Value="Segoe UI Symbol"/>
        <Setter Property="FontWeight" Value="Normal"/>
        <Setter Property="FontSize" Value="56"/>
        <Setter Property="AutomationProperties.AutomationId" Value="BackButton"/>
        <Setter Property="AutomationProperties.Name" Value="Back"/>
        <Setter Property="AutomationProperties.ItemType" Value="Navigation Button"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Button">
                    <Grid x:Name="RootGrid">
                        <Grid Margin="-1,-16,0,0">
                            <TextBlock x:Name="BackgroundGlyph" Text="&#xE0A8;" Foreground="{StaticResource BackButtonBackgroundThemeBrush}"/>
                            <TextBlock x:Name="NormalGlyph" Text="{StaticResource BackButtonGlyph}" Foreground="{StaticResource BackButtonForegroundThemeBrush}"/>
                            <TextBlock x:Name="ArrowGlyph" Text="&#xE0A6;" Foreground="{StaticResource BackButtonPressedForegroundThemeBrush}" Opacity="0"/>
                        </Grid>
                        <Rectangle
                            x:Name="FocusVisualWhite"
                            IsHitTestVisible="False"
                            Stroke="{StaticResource FocusVisualWhiteStrokeThemeBrush}"
                            StrokeEndLineCap="Square"
                            StrokeDashArray="1,1"
                            Opacity="0"
                            StrokeDashOffset="1.5"/>
                        <Rectangle
                            x:Name="FocusVisualBlack"
                            IsHitTestVisible="False"
                            Stroke="{StaticResource FocusVisualBlackStrokeThemeBrush}"
                            StrokeEndLineCap="Square"
                            StrokeDashArray="1,1"
                            Opacity="0"
                            StrokeDashOffset="0.5"/>
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal" />
                                <VisualState x:Name="PointerOver">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="BackgroundGlyph" Storyboard.TargetProperty="Foreground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource BackButtonPointerOverBackgroundThemeBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="NormalGlyph" Storyboard.TargetProperty="Foreground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource BackButtonPointerOverForegroundThemeBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="BackgroundGlyph" Storyboard.TargetProperty="Foreground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource BackButtonForegroundThemeBrush}"/>
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimation
                                            Storyboard.TargetName="ArrowGlyph"
                                            Storyboard.TargetProperty="Opacity"
                                            To="1"
                                            Duration="0"/>
                                        <DoubleAnimation
                                            Storyboard.TargetName="NormalGlyph"
                                            Storyboard.TargetProperty="Opacity"
                                            To="0"
                                            Duration="0"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="RootGrid" Storyboard.TargetProperty="Visibility">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="Collapsed"/>
                                        </ObjectAnimationUsingKeyFrames>
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                            <VisualStateGroup x:Name="FocusStates">
                                <VisualState x:Name="Focused">
                                    <Storyboard>
                                        <DoubleAnimation
                                            Storyboard.TargetName="FocusVisualWhite"
                                            Storyboard.TargetProperty="Opacity"
                                            To="1"
                                            Duration="0"/>
                                        <DoubleAnimation
                                            Storyboard.TargetName="FocusVisualBlack"
                                            Storyboard.TargetProperty="Opacity"
                                            To="1"
                                            Duration="0"/>
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Unfocused" />
                                <VisualState x:Name="PointerFocused" />
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

并且也定义了这个按钮的一些行为。

如果你自定义按钮，你也可以将按钮的Content=" "  FontFamily="Segoe UI Symbol" 即可显示箭头

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Bob Bao [MSFT]
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