先看一下效果吧：
isChecked = false 的时候的效果
isChecked = true 的时候的效果
然后我们来实现一下这个效果吧
第一步：创建一个空的wpf项目；
第二步：在项目里面添加一个checkbox
<Grid>
<CheckBox HorizontalAlignment="Center" IsChecked="True"
BorderBrush="Black" VerticalAlignment="Center"
Content="switch" Background="#FF00ADFF"/>
</Grid>
这个时候的checkbox的样子是这样的
第三步：在页面中右键checkbox，选择 编辑模板，再 编辑副本, 之后确定
vs就会给我们自动生成一个名为”CheckBoxStyle1” 的Checkbox的默认样式的代码,我们通过修改默认样式的代码，把普通的Checkbox变成一个开关。
第四步：修改默认样式
<Grid x:Name="templateRoot"Background="Transparent"SnapsToDevicePixels="True"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <Border x:Name="PART_Border"BorderBrush="{TemplateBinding BorderBrush}"Background="{TemplateBinding Background}"BorderThickness="1"Height="14"Width="25"CornerRadius="5"> <Border x:Name="SwitchBorder"BorderThickness="1"BorderBrush="Gray"Background="White"Width="10"Margin="1"CornerRadius="5"HorizontalAlignment="Right"/> </Border> <ContentPresenter x:Name="contentPresenter"Grid.Column="1"Focusable="False"HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"Margin="{TemplateBinding Padding}"RecognizesAccessKey="True"SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/> </Grid>
把之前的样式代码改成上面的代码，trigger部分，把报错的部分全部删除
这个时候，我们的开关样式就已经完成了
我们现在需要添加一些trigger和动画来实现切换效果
第五步：添加动画和trigger
<Storyboard x:Key="SwitchChecked"> <DoubleAnimationUsingKeyFrames Storyboard.TargetName="SwitchBorder"Storyboard.TargetProperty="(FrameworkElement.Width)"> <EasingDoubleKeyFrame KeyTime="00:00:00"Value="10"/> <EasingDoubleKeyFrame KeyTime="00:00:00.2500000"Value="20"/> <EasingDoubleKeyFrame KeyTime="00:00:00.5000000"Value="10"/> </DoubleAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SwitchBorder"Storyboard.TargetProperty="(FrameworkElement.HorizontalAlignment)"> <DiscreteObjectKeyFrame KeyTime="00:00:00"Value="{x:Static HorizontalAlignment.Left}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.2500000"Value="{x:Static HorizontalAlignment.Right}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.5000000"Value="{x:Static HorizontalAlignment.Right}"/> </ObjectAnimationUsingKeyFrames></Storyboard><Storyboard x:Key="SwitchUnchecked"> <DoubleAnimationUsingKeyFrames Storyboard.TargetName="SwitchBorder"Storyboard.TargetProperty="(FrameworkElement.Width)"> <EasingDoubleKeyFrame KeyTime="00:00:00"Value="10"/> <EasingDoubleKeyFrame KeyTime="00:00:00.2500000"Value="20"/> <EasingDoubleKeyFrame KeyTime="00:00:00.5000000"Value="10"/> </DoubleAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SwitchBorder"Storyboard.TargetProperty="(FrameworkElement.HorizontalAlignment)"> <DiscreteObjectKeyFrame KeyTime="00:00:00"Value="{x:Static HorizontalAlignment.Right}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.2500000"Value="{x:Static HorizontalAlignment.Left}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.5000000"Value="{x:Static HorizontalAlignment.Left}"/> </ObjectAnimationUsingKeyFrames></Storyboard>
上面这段代码就是表示不同状态下的不同动画效果，通过改变SwitchBoder的宽度和对齐方式，就可以实现了
然后我们再把这段动画效果运用到模板中,再添加3个trigger，就可以了
<ControlTemplate.Triggers> <Trigger Property="HasContent"Value="true"> <Setter Property="FocusVisualStyle"Value="{StaticResource OptionMarkFocusVisual}"/> <Setter Property="Padding"Value="4,-1,0,0"/> </Trigger> <EventTrigger RoutedEvent="{x:Static CheckBox.CheckedEvent}"> <BeginStoryboard Storyboard="{StaticResource SwitchChecked}"/> </EventTrigger> <EventTrigger RoutedEvent="{x:Static CheckBox.UncheckedEvent}"> <BeginStoryboard Storyboard="{StaticResource SwitchUnchecked}"/> </EventTrigger> <Trigger Property="IsEnabled"Value="false"> <Setter Property="Background"TargetName="PART_Border"Value="{StaticResource OptionMark.Disabled.Background}"/> <Setter Property="BorderBrush"TargetName="PART_Border"Value="{StaticResource OptionMark.Disabled.Border}"/> </Trigger> <Trigger Property="IsChecked"Value="False"> <Setter Property="Background"Value="White"TargetName="PART_Border"/> <Setter Property="HorizontalAlignment"Value="Left"TargetName="SwitchBorder"/> </Trigger> <Trigger Property="IsMouseOver"Value="True"> <Setter Property="BorderBrush"TargetName="PART_Border"Value="{StaticResource OptionMark.MouseOver.Border}"/> </Trigger> </ControlTemplate.Triggers>
到现在,样式和动画就已经完成了，我们再把代码全部剪切到App.xaml这个项目资源文件下面，再删掉style的命名,x:Key="CheckBoxStyle1"删掉，
这样子我们的项目里面的checkbox就都是开关的样式了，运行项目也不会报错啦,最后的代码如下
<Application.Resources> <Storyboard x:Key="SwitchChecked"> <DoubleAnimationUsingKeyFrames Storyboard.TargetName="SwitchBorder"Storyboard.TargetProperty="(FrameworkElement.Width)"> <EasingDoubleKeyFrame KeyTime="00:00:00"Value="10"/> <EasingDoubleKeyFrame KeyTime="00:00:00.2500000"Value="20"/> <EasingDoubleKeyFrame KeyTime="00:00:00.5000000"Value="10"/> </DoubleAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SwitchBorder"Storyboard.TargetProperty="(FrameworkElement.HorizontalAlignment)"> <DiscreteObjectKeyFrame KeyTime="00:00:00"Value="{x:Static HorizontalAlignment.Left}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.2500000"Value="{x:Static HorizontalAlignment.Right}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.5000000"Value="{x:Static HorizontalAlignment.Right}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> <Storyboard x:Key="SwitchUnchecked"> <DoubleAnimationUsingKeyFrames Storyboard.TargetName="SwitchBorder"Storyboard.TargetProperty="(FrameworkElement.Width)"> <EasingDoubleKeyFrame KeyTime="00:00:00"Value="10"/> <EasingDoubleKeyFrame KeyTime="00:00:00.2500000"Value="20"/> <EasingDoubleKeyFrame KeyTime="00:00:00.5000000"Value="10"/> </DoubleAnimationUsingKeyFrames> <ObjectAnimationUsingKeyFrames Storyboard.TargetName="SwitchBorder"Storyboard.TargetProperty="(FrameworkElement.HorizontalAlignment)"> <DiscreteObjectKeyFrame KeyTime="00:00:00"Value="{x:Static HorizontalAlignment.Right}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.2500000"Value="{x:Static HorizontalAlignment.Left}"/> <DiscreteObjectKeyFrame KeyTime="00:00:00.5000000"Value="{x:Static HorizontalAlignment.Left}"/> </ObjectAnimationUsingKeyFrames> </Storyboard> <Style x:Key="FocusVisual"> <Setter Property="Control.Template"> <Setter.Value> <ControlTemplate> <Rectangle Margin="2"StrokeDashArray="1 2"Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"SnapsToDevicePixels="true"StrokeThickness="1"/> </ControlTemplate> </Setter.Value> </Setter> </Style> <Style x:Key="OptionMarkFocusVisual"> <Setter Property="Control.Template"> <Setter.Value> <ControlTemplate> <Rectangle Margin="14,0,0,0"StrokeDashArray="1 2"Stroke="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"SnapsToDevicePixels="true"StrokeThickness="1"/> </ControlTemplate> </Setter.Value> </Setter> </Style> <SolidColorBrush x:Key="OptionMark.Static.Background"Color="#FFFFFFFF"/> <SolidColorBrush x:Key="OptionMark.Static.Border"Color="#FF707070"/> <SolidColorBrush x:Key="OptionMark.Static.Glyph"Color="#FF212121"/> <SolidColorBrush x:Key="OptionMark.MouseOver.Background"Color="#FFF3F9FF"/> <SolidColorBrush x:Key="OptionMark.MouseOver.Border"Color="#FF5593FF"/> <SolidColorBrush x:Key="OptionMark.MouseOver.Glyph"Color="#FF212121"/> <SolidColorBrush x:Key="OptionMark.Pressed.Background"Color="#FFD9ECFF"/> <SolidColorBrush x:Key="OptionMark.Pressed.Border"Color="#FF3C77DD"/> <SolidColorBrush x:Key="OptionMark.Pressed.Glyph"Color="#FF212121"/> <SolidColorBrush x:Key="OptionMark.Disabled.Background"Color="#FFE6E6E6"/> <SolidColorBrush x:Key="OptionMark.Disabled.Border"Color="#FFBCBCBC"/> <SolidColorBrush x:Key="OptionMark.Disabled.Glyph"Color="#FF707070"/> <Style TargetType="{x:Type CheckBox}"> <Setter Property="FocusVisualStyle"Value="{StaticResource FocusVisual}"/> <Setter Property="Background"Value="{StaticResource OptionMark.Static.Background}"/> <Setter Property="BorderBrush"Value="{StaticResource OptionMark.Static.Border}"/> <Setter Property="Foreground"Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/> <Setter Property="BorderThickness"Value="1"/> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type CheckBox}"> <Grid x:Name="templateRoot"Background="Transparent"SnapsToDevicePixels="True"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <Border x:Name="PART_Border"BorderBrush="{TemplateBinding BorderBrush}"Background="{TemplateBinding Background}"BorderThickness="1"Height="14"Width="25"CornerRadius="5"> <Border x:Name="SwitchBorder"BorderThickness="1"BorderBrush="Gray"Background="White"Width="10"Margin="1"CornerRadius="5"HorizontalAlignment="Right"/> </Border> <ContentPresenter x:Name="contentPresenter"Grid.Column="1"Focusable="False"HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"Margin="{TemplateBinding Padding}"RecognizesAccessKey="True"SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/> </Grid> <ControlTemplate.Triggers> <Trigger Property="HasContent"Value="true"> <Setter Property="FocusVisualStyle"Value="{StaticResource OptionMarkFocusVisual}"/> <Setter Property="Padding"Value="4,-1,0,0"/> </Trigger> <EventTrigger RoutedEvent="{x:Static CheckBox.CheckedEvent}"> <BeginStoryboard Storyboard="{StaticResource SwitchChecked}"/> </EventTrigger> <EventTrigger RoutedEvent="{x:Static CheckBox.UncheckedEvent}"> <BeginStoryboard Storyboard="{StaticResource SwitchUnchecked}"/> </EventTrigger> <Trigger Property="IsEnabled"Value="false"> <Setter Property="Background"TargetName="PART_Border"Value="{StaticResource OptionMark.Disabled.Background}"/> <Setter Property="BorderBrush"TargetName="PART_Border"Value="{StaticResource OptionMark.Disabled.Border}"/> </Trigger> <Trigger Property="IsChecked"Value="False"> <Setter Property="Background"Value="White"TargetName="PART_Border"/> <Setter Property="HorizontalAlignment"Value="Left"TargetName="SwitchBorder"/> </Trigger> <Trigger Property="IsMouseOver"Value="True"> <Setter Property="BorderBrush"TargetName="PART_Border"Value="{StaticResource OptionMark.MouseOver.Border}"/> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style> </Application.Resources>
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