WPF实现好看的Loading动画的示例代码

实现思路

框架使用大于等于.NET40；

Visual Studio 2022;

项目使用 MIT 开源许可协议；

老板觉得公司系统等待动画转圈太简单，所以需要做一个稍微好看点的，就有这篇等待RingLoading动画

最外层使用Viewbox为父控件内部嵌套创建三组 Grid -> Ellipse 、 Border分别给它们指定不同的Angle从左侧开始 -135 225 54，做永久 Angle 动画；

• PART_Ring1.RotateTransform.Angle从From -135 到 -495；
• PART_Ring2.RotateTransform.Angle从From 225 到 -585；
• PART_Ring3.RotateTransform.Angle从From -54 到 -315；

如何绘制；

对Ellipse的StrokeDashArray进行设置23 100就能达到效果；

Border 做为圆设置 Effect 可实现阴影效果；

实现代码

1）RingLoading.cs代码如下；

using System.Windows;
using System.Windows.Controls;

namespace WPFDevelopers.Controls
{
    public class RingLoading : Control
    {
        // Using a DependencyProperty as the backing store for IsStart.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty IsStartProperty =
            DependencyProperty.Register("IsStart", typeof(bool), typeof(RingLoading), new PropertyMetadata(default));

        // Using a DependencyProperty as the backing store for ProgressValue.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty ProgressValueProperty =
            DependencyProperty.Register("ProgressValue", typeof(double), typeof(RingLoading),
                new PropertyMetadata(0d, OnProgressValueChangedCallBack));

        // Using a DependencyProperty as the backing store for Progress.  This enables animation, styling, binding, etc...
        internal static readonly DependencyProperty ProgressProperty =
            DependencyProperty.Register("Progress", typeof(string), typeof(RingLoading), new PropertyMetadata(default));

        // Using a DependencyProperty as the backing store for Maximum.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty MaximumProperty =
            DependencyProperty.Register("Maximum", typeof(double), typeof(RingLoading),
                new PropertyMetadata(100d, OnMaximumPropertyChangedCallBack));

        // Using a DependencyProperty as the backing store for Description.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty DescriptionProperty =
            DependencyProperty.Register("Description", typeof(string), typeof(RingLoading),
                new PropertyMetadata(default));

        static RingLoading()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(RingLoading),
                new FrameworkPropertyMetadata(typeof(RingLoading)));
        }

        public bool IsStart
        {
            get => (bool)GetValue(IsStartProperty);
            set => SetValue(IsStartProperty, value);
        }


        public double ProgressValue
        {
            get => (double)GetValue(ProgressValueProperty);
            set => SetValue(ProgressValueProperty, value);
        }


        internal string Progress
        {
            get => (string)GetValue(ProgressProperty);
            set => SetValue(ProgressProperty, value);
        }


        public double Maximum
        {
            get => (double)GetValue(MaximumProperty);
            set => SetValue(MaximumProperty, value);
        }

        public string Description
        {
            get => (string)GetValue(DescriptionProperty);
            set => SetValue(DescriptionProperty, value);
        }

        private static void OnProgressValueChangedCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (!(d is RingLoading control))
                return;

            if (!double.TryParse(e.NewValue?.ToString(), out var value))
                return;

            var progress = value / control.Maximum;
            control.SetCurrentValue(ProgressProperty, progress.ToString("P0"));
        }

        private static void OnMaximumPropertyChangedCallBack(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (!(d is RingLoading control))
                return;

            if (!double.TryParse(e.NewValue?.ToString(), out var maxValue))
                return;

            if (maxValue <= 0)
                return;

            var progress = control.ProgressValue / maxValue;
            control.SetCurrentValue(ProgressProperty, progress.ToString("P0"));
        }
    }
}

2）RingLoading.xaml代码如下

3）RingLoadingExample.xaml代码如下

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