WPF 使用矩形实现加载Loading动画的方式

首先，创建一个用户控件实现动画Loading的功能：

<UserControl x:Class="K.Controls.Controls.LoadingControl"
             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:K.Controls.Controls"
             mc:Ignorable="d" x:Name="Self"
             Height="{Binding HeightControl,ElementName=Self}" Width="{Binding WidthControl,ElementName=Self}">
    <UserControl.Triggers>
        <EventTrigger RoutedEvent="Loaded">
            <BeginStoryboard>
                <Storyboard>
                    <DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[2].(RotateTransform.Angle)" 
                                                   Storyboard.TargetName="load" RepeatBehavior="Forever">
                        <EasingDoubleKeyFrame KeyTime="0" Value="0"/>
                        <EasingDoubleKeyFrame KeyTime="00:00:0.25" Value="90"/>
                        <EasingDoubleKeyFrame KeyTime="00:00:0.5" Value="180"/>
                        <EasingDoubleKeyFrame KeyTime="00:00:0.75" Value="270"/>
                        <EasingDoubleKeyFrame KeyTime="00:00:1" Value="360"/>
                    </DoubleAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>
        </EventTrigger>
    </UserControl.Triggers>
    <local:SimplePanel>
        <Ellipse x:Name="load" StrokeThickness="{Binding StrokeThicknessControl,ElementName=Self}" StrokeDashCap="Round" RenderTransformOrigin="0.5,0.5">
            <Ellipse.Stroke>
                <LinearGradientBrush StartPoint="0,0" EndPoint="1,1">
                    <GradientStop Color="{Binding LoadingBrush,ElementName=Self}" Offset="0"/>
                    <GradientStop Color="{Binding LoadingOpBrush,ElementName=Self}" Offset="0.8"/>
                </LinearGradientBrush>
            </Ellipse.Stroke>
            <Ellipse.RenderTransform>
                <TransformGroup>
                    <ScaleTransform/>
                    <SkewTransform/>
                    <RotateTransform />
                    <TranslateTransform/>
                </TransformGroup>
            </Ellipse.RenderTransform>
        </Ellipse>
        <local:SimpleStackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Margin="40,0">
            <TextBlock Text="{Binding LoadStr,ElementName=Self}" FontSize="32" Foreground="{DynamicResource RechargeDetailFontBackBrush}" TextWrapping="Wrap" MaxHeight="130" TextTrimming="CharacterEllipsis" TextAlignment="Center"/>
            <TextBlock Text="{Binding LoadSeconds,ElementName=Self,StringFormat=0S}" Visibility="{Binding SecondVisible,ElementName=Self}" FontSize="32" Foreground="{DynamicResource RechargeDetailFontBackBrush}" TextWrapping="Wrap" TextAlignment="Center"/>
        </local:SimpleStackPanel>
        
    </local:SimplePanel>
</UserControl>

 

2、使用依赖属性，来增加一些属性，供引用该该空间的页面，设置对应的需求值

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace K.Controls.Controls
{
    /// <summary>
    /// LoadingControl.xaml 的交互逻辑
    /// </summary>
    public partial class LoadingControl : UserControl
    {
            public LoadingControl()
        {
            InitializeComponent();
        }

        public double WidthControl
        {
            get { return (double)GetValue(WidthControlProperty); }
            set { SetValue(WidthControlProperty, value); }
        }
        public static readonly DependencyProperty WidthControlProperty =
            DependencyProperty.Register("WidthControl", typeof(double), typeof(LoadingControl), new PropertyMetadata(300.0));

        public double HeightControl
        {
            get { return (double)GetValue(HeightControlProperty); }
            set { SetValue(HeightControlProperty, value); }
        }
        public static readonly DependencyProperty HeightControlProperty =
            DependencyProperty.Register("HeightControl", typeof(double), typeof(LoadingControl), new PropertyMetadata(300.0));

        public double StrokeThicknessControl
        {
            get { return (double)GetValue(StrokeThicknessControlProperty); }
            set { SetValue(StrokeThicknessControlProperty, value); }
        }
        public static readonly DependencyProperty StrokeThicknessControlProperty =
            DependencyProperty.Register("StrokeThicknessControl", typeof(double), typeof(LoadingControl), new PropertyMetadata(24.0));

        public Color LoadingBrush
        {
            get { return (Color)GetValue(LoadingBrushProperty); }
            set { SetValue(LoadingBrushProperty, value); }
        }
        public static readonly DependencyProperty LoadingBrushProperty =
            DependencyProperty.Register("LoadingBrush", typeof(Color), typeof(LoadingControl), new PropertyMetadata((Color)ColorConverter.ConvertFromString(Application.Current.Resources["RechargeLoadingFontBrush"].ToString())));

        public Color LoadingOpBrush
        {
            get { return (Color)GetValue(LoadingOpBrushProperty); }
            set { SetValue(LoadingOpBrushProperty, value); }
        }
        public static readonly DependencyProperty LoadingOpBrushProperty =
            DependencyProperty.Register("LoadingOpBrush", typeof(Color), typeof(LoadingControl), new PropertyMetadata((Color)ColorConverter.ConvertFromString(Application.Current.Resources["RechargeLoadingOpBrush"].ToString())));


        public string LoadStr
        {
            get { return (string)GetValue(LoadStrProperty); }
            set { SetValue(LoadStrProperty, value); }
        }
        public static readonly DependencyProperty LoadStrProperty =
            DependencyProperty.Register("LoadStr", typeof(string), typeof(LoadingControl), new PropertyMetadata());

        public int LoadSeconds
        {
            get { return (int)GetValue(LoadSecondsProperty); }
            set { SetValue(LoadSecondsProperty, value); }
        }
        public static readonly DependencyProperty LoadSecondsProperty =
            DependencyProperty.Register("LoadSeconds", typeof(int), typeof(LoadingControl), new PropertyMetadata(5));

        public Visibility SecondVisible
        {
            get { return (Visibility)GetValue(SecondVisibleProperty); }
            set { SetValue(SecondVisibleProperty, value); }
        }
        public static readonly DependencyProperty SecondVisibleProperty =
            DependencyProperty.Register("SecondVisible", typeof(Visibility), typeof(LoadingControl), new PropertyMetadata(Visibility.Visible));

    }
}

　　

3、在其他页面引用上面所创建的控件，实现loading功能

<StackPanel x:Name="loading" Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Center" Visibility="Hidden" Grid.Row="1" Grid.RowSpan="2" Grid.Column="0" Grid.ColumnSpan="2" Margin="20">
    <controls:LoadingControl StrokeThicknessControl="4" WidthControl="38" HeightControl="38"
LoadingBrush="{DynamicResource CashierLoadingBrush}" LoadingOpBrush="{DynamicResource CashierLoadingOpBrush}"
HorizontalAlignment="Center" VerticalAlignment="Center"/>
    <TextBlock Text="正在为您加载商品" FontSize="40" Foreground="{DynamicResource QueryItemSelectForBrush}" VerticalAlignment="Center" HorizontalAlignment="Center" Margin="20,0,0,0"/>
</StackPanel>

　　

4、资源文件里获取对应的颜色

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:cal="clr-namespace:K.Controls.Controls"
                    xmlns:o="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"


    <SolidColorBrush o:Freeze="True" x:Key="QueryItemSelectForBrush" Color="#FFFFFF"/>
    <Color x:Key="RechargeLoadingFontBrush">#ED7C32</Color>
    <Color x:Key="RechargeLoadingOpBrush">#00ED7C32</Color>
    <Color x:Key="CashierLoadingBrush">#FFFFFF</Color>
    <Color x:Key="CashierLoadingOpBrush">#00FFFFFF</Color>

　　<!--资源文件中添加图片-->
　　<BitmapImage x:Key="LoadingWaitEIcon" UriSource="/K.Controls;component/Images/Black/ic_loading2.png"></BitmapImage>
</ResourceDictionary >