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使用WPF怎么编写一个转圈进度条效果？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
1、控件界面
<UserControl x:Class="ProgressBarControl"
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"
mc:Ignorable="d" d:DesignHeight="200" d:DesignWidth="300"
Background="Gray" Loaded="ProgressBarControl_OnLoaded">
<Grid>
<Grid.Resources>
<Style TargetType="Ellipse">
<Setter Property="Height" Value="{Binding EclipseSize}"></Setter>
<Setter Property="Width" Value="{Binding EclipseSize}"></Setter>
<Setter Property="Stretch" Value="Fill"></Setter>
<!--设置圆的颜色-->
<Setter Property="Fill" Value="White"></Setter>
</Style>
</Grid.Resources>
<StackPanel HorizontalAlignment="Center"
VerticalAlignment="Center">
<Viewbox Width="{Binding ViewBoxSize}" Height="{Binding ViewBoxSize}"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<Grid x:Name="LayoutRoot"
Background="Transparent"
HorizontalAlignment="Center"
VerticalAlignment="Center">
<!--此处有canvas的加载和卸载事件-->
<Canvas x:Name="ProgressBarCanvas" RenderTransformOrigin="0.5,0.5"
HorizontalAlignment="Center"
VerticalAlignment="Center" Width="{Binding CanvasSize}"
Height="{Binding CanvasSize}" Loaded="HandleLoaded"
Unloaded="HandleUnloaded" >
<!--画圆-->
<Canvas.RenderTransform>
<RotateTransform x:Name="SpinnerRotate" Angle="0" />
</Canvas.RenderTransform>
</Canvas>
</Grid>
</Viewbox>
</StackPanel>
</Grid>
</UserControl>2、控件后台逻辑：
控件后台：
/// <summary>
/// 进度条
/// </summary>
public partial class ProgressBarControl : UserControl
{
//集成到按指定时间间隔和指定优先级处理的 System.Windows.Threading.Dispatcher 队列中的计时器。
private DispatcherTimer animationTimer;
private ProgressBarDataModel _dataModel;
private int index = 0;
#region 构造方法与加载
/// <summary>
/// 构造方法
/// </summary>
public ProgressBarControl()
{
InitializeComponent();
}
/// <summary>
/// 加载后刷新
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ProgressBarControl_OnLoaded(object sender, RoutedEventArgs e)
{
animationTimer = new DispatcherTimer(DispatcherPriority.ContextIdle, Dispatcher);
//指定时间间隔
animationTimer.Interval = new TimeSpan(0, 0, 0, 0, TimeSpan);
if (EllipseCount < 1)
{
EllipseCount = 12;
}
for (int i = 0; i < EllipseCount; i++)
{
ProgressBarCanvas.Children.Add(new Ellipse());
}
var dataModel = new ProgressBarDataModel()
{
CanvasSize = CanvasSize,
EclipseSize = EllipseSize
};
_dataModel = dataModel;
this.DataContext = dataModel;
}
#endregion
#region 属性
/// <summary>
/// 获取或设置圆圈数量
/// 默认12
/// </summary>
public double EllipseCount
{
get { return (double)GetValue(EllipseCountProperty); }
set { SetValue(EllipseCountProperty, value); }
}
public static readonly DependencyProperty EllipseCountProperty =
DependencyProperty.Register("EllipseCount", typeof(double), typeof(ProgressBarControl),
new FrameworkPropertyMetadata(10.0, FrameworkPropertyMetadataOptions.AffectsRender));
/// <summary>
/// 获取或设置圆圈大小
/// 默认10
/// </summary>
public double EllipseSize
{
get { return (double)GetValue(EllipseSizeProperty); }
set { SetValue(EllipseSizeProperty, value); }
}
public static readonly DependencyProperty EllipseSizeProperty =
DependencyProperty.Register("EllipseSize", typeof(double), typeof(ProgressBarControl),
new FrameworkPropertyMetadata(10.0, FrameworkPropertyMetadataOptions.AffectsRender));
/// <summary>
/// 获取或设置面板大小
/// 默认80
/// </summary>
public double CanvasSize
{
get { return (double)GetValue(CanvasSizeProperty); }
set { SetValue(CanvasSizeProperty, value); }
}
public static readonly DependencyProperty CanvasSizeProperty =
DependencyProperty.Register("CanvasSize", typeof(double), typeof(ProgressBarControl),
new FrameworkPropertyMetadata(80.0, FrameworkPropertyMetadataOptions.AffectsRender));
/// <summary>
/// 获取或设置每次旋转角度
/// 默认10.0
/// </summary>
public double StepAngle
{
get { return (double)GetValue(StepAngleProperty); }
set { SetValue(StepAngleProperty, value); }
}
public static readonly DependencyProperty StepAngleProperty =
DependencyProperty.Register("StepAngle", typeof(double), typeof(ProgressBarControl),
new FrameworkPropertyMetadata(10.0, FrameworkPropertyMetadataOptions.AffectsRender));
/// <summary>
/// 获取或设置每次旋转间隔时间（毫秒）
/// 默认100毫秒
/// </summary>
public int TimeSpan
{
get { return (int)GetValue(TimeSpanProperty); }
set { SetValue(TimeSpanProperty, value); }
}
public static readonly DependencyProperty TimeSpanProperty =
DependencyProperty.Register("TimeSpan", typeof(int), typeof(ProgressBarControl),
new FrameworkPropertyMetadata(100, FrameworkPropertyMetadataOptions.AffectsRender));
#endregion
#region 方法
/// <summary>
/// Canvas加载
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void HandleLoaded(object sender, RoutedEventArgs e)
{
//设置设置圆的位置和旋转角度
SetEclipsePosition(_dataModel);
//DesignerProperties 提供用于与设计器进行通信的附加属性。
if (!DesignerProperties.GetIsInDesignMode(this))
{
if (this.Visibility == System.Windows.Visibility.Visible)
{
//超过计时器间隔时发生。
animationTimer.Tick += HandleAnimationTick;
animationTimer.Start();
}
}
}
/// <summary>
/// 设置圆的位置和旋转角度
/// </summary>
private void SetEclipsePosition(ProgressBarDataModel dataModel)
{
//圆周长就是：C = π * d 或者C=2*π*r（其中d是圆的直径，r是圆的半径）
double r =dataModel.R;
var children=ProgressBarCanvas.Children;
int count = children.Count;
double step = (Math.PI * 2) / count;
//根据圆中正弦、余弦计算距离
int index = 0;
foreach (var element in children)
{
var ellipse = element as Ellipse;
//透明度
var opacity = Convert.ToDouble(index)/(count - 1);
ellipse.SetValue(UIElement.OpacityProperty, opacity<0.05?0.05:opacity);
//距离
double left = r + Math.Sin(step*index)*r;
ellipse.SetValue(Canvas.LeftProperty,left);
double top = r - Math.Cos(step*index)*r;
ellipse.SetValue(Canvas.TopProperty, top);
index++;
}
}
/// <summary>
/// Canvas卸载时
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void HandleUnloaded(object sender, RoutedEventArgs e)
{
animationTimer.Stop();
//除去委托
animationTimer.Tick -= HandleAnimationTick;
}
/// <summary>
/// 超过计时器间隔时发生。
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void HandleAnimationTick(object sender, EventArgs e)
{
//设置旋转角度
SpinnerRotate.Angle = (SpinnerRotate.Angle + StepAngle) % 360;
}
#endregion
}数据Model类：
/// <summary>
/// 进度条Model类
/// </summary>
public class ProgressBarDataModel
{
public double EclipseSize { get; set; }
public double CanvasSize { get; set; }
public double ViewBoxSize
{
get
{
double length = Convert.ToDouble(CanvasSize) - Convert.ToDouble(EclipseSize);
return length;
}
}
public double EclipseLeftLength
{
get
{
double length = Convert.ToDouble(CanvasSize) / 2;
return length;
}
}
public double R
{
get
{
double length = (Convert.ToDouble(CanvasSize) - Convert.ToDouble(EclipseSize)) / 2;
return length;
}
}
}3、取用控件
<control:ProgressBarControl CanvasSize="100" EllipseCount="10" EllipseSize="10" StepAngle="36" TimeSpan="60"/>
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