我在我的UWP应用程序中使用PasswordBox，我想始终显示密码显示按钮。此外，按下时它应按预期工作，并应显示密码。
我修改了PasswordBox控件的默认样式，将Password Reveal按钮的可见性设置为true。它工作正常，按钮始终可见。但问题是密码泄露功能仅在密码被清除并从开始输入时才有效。
<Style x:Key="PasswordBoxStyle" TargetType="PasswordBox">
<Setter Property="Foreground" Value="Black"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="PasswordBox">
<Grid Background="Transparent">
<Grid.Resources>
<Style x:Name="RevealButtonStyle" TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid x:Name="ButtonLayoutGrid" BorderBrush="{ThemeResource TextBoxButtonBorderThemeBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Background="{ThemeResource TextBoxButtonBackgroundThemeBrush}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="GlyphElement"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAccentBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonLayoutGrid"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAccentBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="GlyphElement"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltChromeWhiteBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Storyboard.TargetName="ButtonLayoutGrid"
Storyboard.TargetProperty="Opacity"
To="0"
Duration="0" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<TextBlock x:Name="GlyphElement"
Foreground="{ThemeResource SystemControlForegroundChromeBlackMediumBrush}"
VerticalAlignment="Center"
HorizontalAlignment="Center"
FontStyle="Normal"
FontSize="16"
Text=""
FontFamily="{ThemeResource SymbolThemeFontFamily}"
AutomationProperties.AccessibilityView="Raw"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="HeaderContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseMediumLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BackgroundElement"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledTransparentBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement"
Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledChromeDisabledLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledChromeDisabledLowBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Normal">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="BorderElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="Gray"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="BorderElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="0.5"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="BackgroundElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="White"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="BorderElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="Gray"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="BorderElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="BackgroundElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="White"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Focused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="BorderElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="Gray"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderThickness" Storyboard.TargetName="BorderElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="1"/>
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="BackgroundElement">
<DiscreteObjectKeyFrame KeyTime="0" Value="White"/>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ButtonStates">
<VisualState x:Name="ButtonVisible">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="RevealButton"
Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="ButtonCollapsed" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
</Grid.RowDefinitions>
<Border x:Name="BackgroundElement"
Grid.Row="1"
Background="{TemplateBinding Background}"
Margin="{TemplateBinding BorderThickness}"
Opacity="{ThemeResource TextControlBackgroundRestOpacity}"
Grid.ColumnSpan="2"
Grid.RowSpan="1"/>
<Border x:Name="BorderElement"
Grid.Row="1"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Grid.ColumnSpan="2"
Grid.RowSpan="1"/>
<ContentPresenter x:Name="HeaderContentPresenter"
x:DeferLoadStrategy="Lazy"
Visibility="Collapsed"
Grid.Row="0"
Foreground="{ThemeResource SystemControlForegroundBaseHighBrush}"
Margin="0,0,0,8"
Grid.ColumnSpan="2"
Content="{TemplateBinding Header}"
ContentTemplate="{TemplateBinding HeaderTemplate}"
FontWeight="Normal" />
<ScrollViewer x:Name="ContentElement"
Grid.Row="1"
HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}"
HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}"
VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
IsHorizontalRailEnabled="{TemplateBinding ScrollViewer.IsHorizontalRailEnabled}"
IsVerticalRailEnabled="{TemplateBinding ScrollViewer.IsVerticalRailEnabled}"
Margin="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}"
IsTabStop="False"
ZoomMode="Disabled"
AutomationProperties.AccessibilityView="Raw"/>
<ContentControl x:Name="PlaceholderTextContentPresenter"
Grid.Row="1"
Foreground="{ThemeResource SystemControlPageTextBaseMediumBrush}"
Margin="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}"
IsTabStop="False"
Grid.ColumnSpan="2"
Content="{TemplateBinding PlaceholderText}"
IsHitTestVisible="False"/>
<Button x:Name="RevealButton"
Grid.Row="1"
Style="{StaticResource RevealButtonStyle}"
BorderThickness="{TemplateBinding BorderThickness}"
Margin="{ThemeResource HelperButtonThemePadding}"
IsTabStop="False"
Grid.Column="1"
Visibility="Visible"
FontSize="{TemplateBinding FontSize}"
VerticalAlignment="Stretch"
MinWidth="34" />
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
请注意，我已将“显示密码”按钮的样式更改为将可见性设置为true（默认情况下已折叠）：
<Button x:Name="RevealButton"
Grid.Row="1"
Style="{StaticResource RevealButtonStyle}"
BorderThickness="{TemplateBinding BorderThickness}"
Margin="{ThemeResource HelperButtonThemePadding}"
IsTabStop="False"
Grid.Column="1"
Visibility="Visible"
FontSize="{TemplateBinding FontSize}"
VerticalAlignment="Stretch"
MinWidth="34" />
答案 0 :(得分：3)
这是设计使然，您可以参考PasswordBox：
密码显示按钮仅在PasswordBox第一次收到焦点并输入字符时显示。如果PasswordBox失去焦点然后重新获得焦点，则除非清除密码并重新开始输入字符，否则不会再显示“显示”按钮。
默认情况下，它的行为类似，即使您始终显示RevealButton，现在的问题是Button无法正常工作。
官方推荐的方法是创建一个类似的UI，例如CheckBox，让用户切换显示模式。我还注意到您在样式中将默认ToggleButton更改为Button，如果您坚持使用此Button来切换显示模式，则可以在背后是这样的：
public Page21()
{
this.InitializeComponent();
this.Loaded += Page21_Loaded;
}
private Button RevealButton;
private void Page21_Loaded(object sender, RoutedEventArgs e)
{
RevealButton = FindChildOfType<Button>(passwordbox);
RevealButton.Tapped += RevealButton_Tapped;
RevealButton.ClickMode = ClickMode.Press;
RevealButton.Click += RevealButton_Click;
RevealButton.RightTapped += RevealButton_RightTapped;
}
private void RevealButton_RightTapped(object sender, RightTappedRoutedEventArgs e)
{
Debug.WriteLine("RevealButton_RightTapped");
passwordbox.PasswordRevealMode = PasswordRevealMode.Hidden;
}
private void RevealButton_Tapped(object sender, TappedRoutedEventArgs e)
{
Debug.WriteLine("RevealButton_Tapped");
passwordbox.PasswordRevealMode = PasswordRevealMode.Hidden;
}
private void RevealButton_Click(object sender, RoutedEventArgs e)
{
Debug.WriteLine("RevealButton_Click");
passwordbox.PasswordRevealMode = PasswordRevealMode.Visible;
}
public static T FindChildOfType<T>(DependencyObject root) where T : class
{
var queue = new Queue<DependencyObject>();
queue.Enqueue(root);
while (queue.Count > 0)
{
DependencyObject current = queue.Dequeue();
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(current); i++)
{
var child = VisualTreeHelper.GetChild(current, i);
var typedChild = child as T;
if (typedChild != null)
{
return typedChild;
}
queue.Enqueue(child);
}
}
return null;
}
这里的基本想法是首先获取RevealButton中的PasswordBox，然后更改ClickMode的{{1}}，以便在RevealButton事件被触发时触发正在按Click，默认情况下，指针释放时会触发Button / Tapped RightTapped事件，最后您可以更改Button在这两个事件中。 Tapped事件在PC上运行良好，但在移动设备上，我使用PasswordRevealMode作为RightTapped发布的点。
答案 1 :(得分：0)
只需找到按钮并将其可见性设置为Visibility.Visible，即可使按钮始终可见。我假设默认模板中的按钮使用TemplateBinding并且其可见性不是以编程方式切换的，因为直接设置其可见性会破坏任何现有绑定，例如前面提到的。
我使用以下扩展方法来查找按钮：
public static T GetChildOfType<T>(this DependencyObject Object) where T : DependencyObject
{
if (Object == null)
return null;
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(Object); i++)
{
var Child = VisualTreeHelper.GetChild(Object, i);
var Result = (Child as T) ?? GetChildOfType<T>(Child);
if (Result != null) return Result;
}
return null;
}
然后，当PasswordBox加载时，执行以下操作：
private void OnLoaded(object sender, RoutedEventArgs e)
{
var RevealButton = (sender as PasswordBox).GetChildOfType<Button>();
if (RevealButton != null)
RevealButton.Visibility = Visibility.Visible;
}
如果您愿意，可以将通用ContentControl类定义为子类PasswordBox;否则，只需将上述Loaded事件附加到每个实例。
但是有一个缺点：失去焦点后，按钮不再具有切换密码可见性的能力，尽管可见。目前还不清楚为什么。