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PS：有更好的方式欢迎推荐。

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代码如下

一、创建 CountdownTimer.xaml 继承ContentControl代码如下。

using System;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Media.Effects;namespace WPFDevelopers.Controls
{public enum CountdownTimerEffect{Default,MultiColor}public class CountdownTimer : ContentControl{private Storyboard storyboard;private const double seconds = 800;private double currentSeconds = seconds;private Grid myGrid;public int Number{get { return (int)GetValue(NumberProperty); }set { SetValue(NumberProperty, value); }}public static readonly DependencyProperty NumberProperty =DependencyProperty.Register("Number", typeof(int), typeof(CountdownTimer), new PropertyMetadata(3));/// <summary>/// 完成后回到开始/// </summary>public bool IsFinishStart{get { return (bool)GetValue(IsFinishStartProperty); }set { SetValue(IsFinishStartProperty, value); }}public static readonly DependencyProperty IsFinishStartProperty =DependencyProperty.Register("IsFinishStart", typeof(bool), typeof(CountdownTimer), new PropertyMetadata(false));public CountdownTimerEffect CountdownTimerEffect{get { return (CountdownTimerEffect)GetValue(CountdownTimerEffectProperty); }set { SetValue(CountdownTimerEffectProperty, value); }}public static readonly DependencyProperty CountdownTimerEffectProperty =DependencyProperty.Register("ExhibitionEnum", typeof(CountdownTimerEffect), typeof(CountdownTimer), new PropertyMetadata(CountdownTimerEffect.Default));public override void OnApplyTemplate(){base.OnApplyTemplate();NameScope.SetNameScope(this, new NameScope());if (FontSize == SystemFonts.CaptionFontSize)FontSize = 200;FontFamily = DrawingContextHelper.FontFamily;storyboard = new Storyboard();myGrid = new Grid();myGrid.Name = "myGrid";myGrid.ToolTip = "MouseDown";myGrid.Background = new SolidColorBrush(Colors.White);var linearGradient = new LinearGradientBrush{GradientStops = new GradientStopCollection{new GradientStop{ Color = Colors.Red, Offset = 1 },new GradientStop{ Color = Colors.White, Offset = 1 },new GradientStop{ Color = Colors.White, Offset = .5 },new GradientStop{ Color = Colors.Red, Offset = .5 },new GradientStop{ Color = Colors.Red, Offset = 0 },new GradientStop{ Color = Colors.White, Offset = 0 },},StartPoint = new Point(0.5, 0),EndPoint = new Point(10, 10),SpreadMethod = GradientSpreadMethod.Reflect,MappingMode = BrushMappingMode.Absolute};SolidColorBrush solidColor;this.RegisterName(myGrid.Name, myGrid);var num = 0;for (int i = Number; i >= num; i--){var textBlock = new TextBlock();switch (CountdownTimerEffect){case CountdownTimerEffect.Default:if (i % 2 == 0)solidColor = Brushes.White;elsesolidColor = Brushes.Black;textBlock.Foreground = solidColor;break;case CountdownTimerEffect.MultiColor:textBlock.Foreground = linearGradient;break;}textBlock.Text = i.ToString();textBlock.Name = $"textBlock{i}";textBlock.FontSize = FontSize;textBlock.FontWeight = FontWeights.ExtraBold;textBlock.VerticalAlignment = VerticalAlignment.Center;textBlock.HorizontalAlignment = HorizontalAlignment.Center;textBlock.RenderTransformOrigin = new Point(.5, .5);textBlock.Effect = new DropShadowEffect{ShadowDepth = 2,RenderingBias = RenderingBias.Performance,Color = Colors.Red};if (!i.Equals(Number))textBlock.Opacity = 0;textBlock.RenderTransform = new ScaleTransform{ScaleX = 2,ScaleY = 2,};this.RegisterName(textBlock.Name, textBlock);TimeSpan beginTime = TimeSpan.Zero;if (storyboard.Children.Count > 0){beginTime = TimeSpan.FromMilliseconds(currentSeconds);currentSeconds += seconds;}var cubicEase = new CubicEase{EasingMode = EasingMode.EaseIn,};DoubleAnimation doubleAnimationScaleX = new DoubleAnimation();doubleAnimationScaleX.From = 2;doubleAnimationScaleX.To = 0;doubleAnimationScaleX.EasingFunction = cubicEase;Storyboard.SetTargetName(doubleAnimationScaleX, textBlock.Name);Storyboard.SetTargetProperty(doubleAnimationScaleX, new PropertyPath("(TextBlock.RenderTransform).(ScaleTransform.ScaleX)"));var doubleAnimationScaleY = new DoubleAnimation{From = 2,To = 0,EasingFunction = cubicEase};Storyboard.SetTargetName(doubleAnimationScaleY, textBlock.Name);Storyboard.SetTargetProperty(doubleAnimationScaleY, new PropertyPath("(TextBlock.RenderTransform).(ScaleTransform.ScaleY)"));doubleAnimationScaleX.BeginTime = beginTime;doubleAnimationScaleY.BeginTime = beginTime;doubleAnimationScaleX.Duration = TimeSpan.FromMilliseconds(seconds);doubleAnimationScaleY.Duration = TimeSpan.FromMilliseconds(seconds);if (!i.Equals(Number)){var doubleAnimationOpacity = new DoubleAnimation{Duration = TimeSpan.FromMilliseconds(0),BeginTime = beginTime,From = 0,To = 1};Storyboard.SetTargetName(doubleAnimationOpacity, textBlock.Name);Storyboard.SetTargetProperty(doubleAnimationOpacity, new PropertyPath(TextBlock.OpacityProperty));storyboard.Children.Add(doubleAnimationOpacity);}if (i % 2 == 0){var colorAnimation = new ColorAnimation{Duration = TimeSpan.FromMilliseconds(0),From = Colors.White,BeginTime = beginTime,To = Colors.Black};Storyboard.SetTargetName(colorAnimation, myGrid.Name);Storyboard.SetTargetProperty(colorAnimation, new PropertyPath("(Panel.Background).(SolidColorBrush.Color)"));storyboard.Children.Add(colorAnimation);}else{if (!i.Equals(Number)){var colorAnimation = new ColorAnimation{Duration = TimeSpan.FromMilliseconds(0),BeginTime = beginTime,From = Colors.Black,To = Colors.White};Storyboard.SetTargetName(colorAnimation, myGrid.Name);Storyboard.SetTargetProperty(colorAnimation, new PropertyPath("(Panel.Background).(SolidColorBrush.Color)"));storyboard.Children.Add(colorAnimation);}}storyboard.Children.Add(doubleAnimationScaleX);storyboard.Children.Add(doubleAnimationScaleY);myGrid.Children.Add(textBlock);}this.Content = myGrid;}protected override void OnMouseDown(MouseButtonEventArgs e){base.OnMouseDown(e);if (storyboard != null && storyboard.Children.Count > 0){storyboard.Completed += (s, y) =>{myGrid.Background = new SolidColorBrush(Colors.White);if (IsFinishStart){var scaleTransform = new ScaleTransform{ScaleX = 2,ScaleY = 2};var tb = myGrid.Children.Cast<TextBlock>().First();tb.RenderTransform = scaleTransform;}};storyboard.Begin(this);}}}
}

二、CountdownTimerExample.xaml 代码如下

<UserControl x:Class="WPFDevelopers.Samples.ExampleViews.CountdownTimerExample"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:local="clr-namespace:WPFDevelopers.Samples.ExampleViews"xmlns:wpfdev="https://github.com/yanjinhuagood/WPFDevelopers"mc:Ignorable="d" d:DesignHeight="450" d:DesignWidth="800"><Grid Margin="10" Grid.Row="1"><Grid.RowDefinitions><RowDefinition Height="Auto"/><RowDefinition Height="*"/></Grid.RowDefinitions><Border Margin="0,0,0,0" Background="{StaticResource WhiteSolidColorBrush}" CornerRadius="4,4,0,0" Effect="{StaticResource NormalShadowDepth}"><wpfdev:NavigateMenu TabStripPlacement="Top" SelectionChanged="NavigateMenu_SelectionChanged"><ListBoxItem Content="Default"/><ListBoxItem Content="MultiColor"/></wpfdev:NavigateMenu></Border><Border Grid.Row="1" Background="{StaticResource WhiteSolidColorBrush}" CornerRadius="0,0,4,4"Effect="{StaticResource NormalShadowDepth}"><Grid Margin="10"><wpfdev:CountdownTimer Number="3" x:Name="CountdownTimer1"/><UniformGrid Columns="4" Visibility="Collapsed" x:Name="CountdownTimerGroup"><wpfdev:CountdownTimer Number="9" CountdownTimerEffect="MultiColor" FontSize="150" IsFinishStart="True"/><wpfdev:CountdownTimer Number="5" CountdownTimerEffect="MultiColor" FontSize="150" IsFinishStart="True"/><wpfdev:CountdownTimer Number="2" CountdownTimerEffect="MultiColor" FontSize="150" IsFinishStart="True"/><wpfdev:CountdownTimer Number="7" CountdownTimerEffect="MultiColor" FontSize="150" IsFinishStart="True"/></UniformGrid></Grid></Border></Grid>
</UserControl>

三、CountdownTimerExample.xaml.cs 代码如下

using System.Windows;
using System.Windows.Controls;namespace WPFDevelopers.Samples.ExampleViews
{/// <summary>/// CountdownTimerExample.xaml 的交互逻辑/// </summary>public partial class CountdownTimerExample : UserControl{public CountdownTimerExample(){InitializeComponent();}private void NavigateMenu_SelectionChanged(object sender, SelectionChangedEventArgs e){var item = e.AddedItems[0] as ListBoxItem;if (item == null) return;switch (item.Content.ToString()){case "Default":if(CountdownTimer1.Visibility != Visibility.Visible){CountdownTimer1.Visibility = Visibility.Visible;CountdownTimerGroup.Visibility = Visibility.Collapsed;}break;case "MultiColor":if (CountdownTimerGroup.Visibility != Visibility.Visible){CountdownTimerGroup.Visibility = Visibility.Visible;CountdownTimer1.Visibility = Visibility.Collapsed;}break;}}}
}

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效果预览

鸣谢素材提供者 - 贺龙

源码地址如下

Github：https://github.com/WPFDevelopersOrg

Gitee：https://gitee.com/WPFDevelopersOrg

WPF开发者QQ群： 340500857

Github：https://github.com/WPFDevelopersOrg

出处：https://www.cnblogs.com/yanjinhua

版权：本作品采用「署名-非商业性使用-相同方式共享 4.0 国际」许可协议进行许可。

转载请著名作者出处 https://github.com/WPFDevelopersOrg