我正在重写 PhoneTextBox 的样式，将默认背景更改为“透明”，将前景更改为“白色”，将 BorderBrush 更改为“白色”，因为我想设计一个深色主题。
但是出现了一个问题，文本输入指示器消失了。我感谢原因是文本输入指示器的前景是黑色的，所以用户看不到它。但我找不到定义文本输入指示器的前景的方法。任何提示都会被应用。
附言。我不知道如何描述该指标，我是否自己编了一个“text-input-indicator”这个词，如下所示：
正常情况下，会出现黑色竖线。
重写样式后，用户看不到黑色竖线：
和xaml代码：
<Style x:Key="PhoneTextBoxStyle" TargetType="toolkit:PhoneTextBox">
<Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}"/>
<Setter Property="FontSize" Value="{StaticResource PhoneFontSizeMediumLarge}"/>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Foreground" Value="White"/>
<Setter Property="BorderBrush" Value="White"/>
<Setter Property="SelectionBackground" Value="{StaticResource PhoneAccentBrush}"/>
<Setter Property="SelectionForeground" Value="White"/>
<Setter Property="BorderThickness" Value="2"/>
<Setter Property="Padding" Value="{StaticResource PhoneBorderThickness}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="toolkit:PhoneTextBox">
<Grid x:Name="RootGrid" Background="Transparent">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Disabled">
</VisualState>
<VisualState x:Name="Enabled">
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused">
</VisualState>
<VisualState x:Name="Unfocused"/>
</VisualStateGroup>
<VisualStateGroup x:Name="LengthIndicatorStates">
<VisualState x:Name="LengthIndicatorVisible">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="LengthIndicator">
<DiscreteObjectKeyFrame KeyTime="0:0:0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Margin" Storyboard.TargetName="RootGrid">
<DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0, 0, 0, 27"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="LengthIndicator">
<DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0.6"/>
</ObjectAnimationUsingKeyFrames>
<DoubleAnimation Duration="0:0:0.350" To="32" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.Y)" Storyboard.TargetName="LengthIndicator">
<DoubleAnimation.EasingFunction>
<ExponentialEase Exponent="6"/>
</DoubleAnimation.EasingFunction>
</DoubleAnimation>
</Storyboard>
</VisualState>
<VisualState x:Name="LengthIndicatorHidden">
<Storyboard>
<DoubleAnimation Duration="0:0:0.350" To="0" Storyboard.TargetProperty="(UIElement.RenderTransform).(TranslateTransform.Y)" Storyboard.TargetName="LengthIndicator">
<DoubleAnimation.EasingFunction>
<ExponentialEase Exponent="6"/>
</DoubleAnimation.EasingFunction>
</DoubleAnimation>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Margin" Storyboard.TargetName="RootGrid">
<DiscreteObjectKeyFrame KeyTime="0:0:0" Value="0, 0, 0, 0"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity" Storyboard.TargetName="LengthIndicator">
<DiscreteObjectKeyFrame KeyTime="0:0:0.350" Value="0"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Visibility" Storyboard.TargetName="LengthIndicator">
<DiscreteObjectKeyFrame KeyTime="0:0:0.350">
<DiscreteObjectKeyFrame.Value>
<Visibility>Collapsed</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Border x:Name="LengthIndicatorBorder">
<TextBlock x:Name="LengthIndicator" Foreground="{StaticResource PhoneContrastBackgroundBrush}" FontSize="{StaticResource PhoneFontSizeNormal}" HorizontalAlignment="Right" Margin="0" Opacity="0" TextAlignment="Right" VerticalAlignment="Bottom">
<TextBlock.RenderTransform>
<TranslateTransform/>
</TextBlock.RenderTransform>
</TextBlock>
</Border>
<Border x:Name="HintBorder" BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{TemplateBinding Background}" Margin="0">
<Grid>
<ContentControl x:Name="HintContent" Background="Transparent" Content="{TemplateBinding Hint}"
HorizontalAlignment="Left" Margin="3,5,3,0" Style="{TemplateBinding HintStyle}"
Foreground="Gray"
Visibility="{TemplateBinding ActualHintVisibility}" VerticalAlignment="Top"/>
<ContentControl x:Name="ContentElement" BorderThickness="0" HorizontalContentAlignment="Stretch"
Margin="{StaticResource PhoneTextBoxInnerMargin}"
Padding="{TemplateBinding Padding}"
VerticalContentAlignment="Stretch"/>
</Grid>
</Border>
<Border x:Name="TextBorder" BorderBrush="White"
BorderThickness="{TemplateBinding BorderThickness}"
Background="Transparent" Margin="0" Visibility="Collapsed">
<TextBox x:Name="Text" Foreground="White"
FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}"
FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}"
HorizontalAlignment="Left" SelectionForeground="{TemplateBinding SelectionForeground}"
SelectionBackground="{TemplateBinding SelectionBackground}"
TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}"
Text="{TemplateBinding Text}"/>
</Border>
<Border x:Name="ActionIconBorder" Background="Transparent" HorizontalAlignment="Right" Height="54" VerticalAlignment="Bottom" Width="54">
<Image x:Name="ActionIcon" Height="54" Source="{TemplateBinding ActionIcon}" Width="54"/>
</Border>
<TextBlock x:Name="MeasurementTextBlock" FontWeight="{TemplateBinding FontWeight}" FontStyle="{TemplateBinding FontStyle}" FontStretch="{TemplateBinding FontStretch}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" IsHitTestVisible="False" Margin="8" Opacity="0" TextAlignment="{TemplateBinding TextAlignment}" TextWrapping="{TemplateBinding TextWrapping}" Text="{TemplateBinding Text}"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
可能您正在寻找CaretBrush, SelectionBackground and SelectionForeground。我不知道这些属性是否已绑定toolkit:PhoneTextBox，但无论如何你绝对可以手动重新设计它。
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