uwp - 做一个相对炫酷的动画按钮/按钮动画

　　看腻了系统自带的button animation何不尝试下自定义一个较为炫酷的动画顺便提升用户体验。效果图：

动画分为几个部分，分别是：内圆从中心放大（1）并同时渐隐（2），外圆从中心放大（3）并同时渐隐（4），按钮整体从中心缩小放大（5），非常简单对吧，代码也是。

为了方便调用，我用一个自定义用户控件来做，图标是用iconfont，这样可以在任何地方使用，首先新建【AnimationButton.xaml】用户控件，前台代码将自动生成的部分替换：

<UserControl.Resources>
        <Storyboard x:Name="Storyboard">
            <!--整体缩小动画-->
            <DoubleAnimation From="0.5" To="1" Duration="00:00:0.5"
            Storyboard.TargetName="AnGridScaleTransform3"
            Storyboard.TargetProperty="ScaleY">
                <DoubleAnimation.EasingFunction>
                    <PowerEase  EasingMode="EaseInOut" 

                             />
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
            <DoubleAnimation From="0.5" To="1" Duration="00:00:0.5"
            Storyboard.TargetName="AnGridScaleTransform3"
            Storyboard.TargetProperty="ScaleX">
                <DoubleAnimation.EasingFunction>
                    <PowerEase EasingMode="EaseInOut"
                             />
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>

            <!--1-->
            <DoubleAnimation From="1" To="0" Duration="00:00:0.5"
            Storyboard.TargetName="Angrid"
            Storyboard.TargetProperty="Opacity">
                <DoubleAnimation.EasingFunction>
                    <PowerEase  EasingMode="EaseInOut" 

                             />
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>

            <DoubleAnimation From="0" To="2" Duration="00:00:0.5"
            Storyboard.TargetName="AnGridScaleTransform"
            Storyboard.TargetProperty="ScaleY">
                <DoubleAnimation.EasingFunction>
                    <PowerEase  EasingMode="EaseInOut" 

                             />
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
            <DoubleAnimation From="0" To="2" Duration="00:00:0.5"
            Storyboard.TargetName="AnGridScaleTransform"
            Storyboard.TargetProperty="ScaleX">
                <DoubleAnimation.EasingFunction>
                    <PowerEase EasingMode="EaseInOut"
                             />
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
            <!--2-->
            <DoubleAnimation From="1" To="0" Duration="00:00:0.5"
            Storyboard.TargetName="Angrid2"
            Storyboard.TargetProperty="Opacity">
                <DoubleAnimation.EasingFunction>
                    <PowerEase  EasingMode="EaseInOut" 

                             />
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>

            <DoubleAnimation From="0" To="1" Duration="00:00:0.5"
            Storyboard.TargetName="AnGridScaleTransform2"
            Storyboard.TargetProperty="ScaleY">
                <DoubleAnimation.EasingFunction>
                    <PowerEase  EasingMode="EaseInOut" 

                             />
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
            <DoubleAnimation From="0" To="1" Duration="00:00:0.5"
            Storyboard.TargetName="AnGridScaleTransform2"
            Storyboard.TargetProperty="ScaleX">
                <DoubleAnimation.EasingFunction>
                    <PowerEase EasingMode="EaseInOut"
                             />
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
        </Storyboard>
    </UserControl.Resources>
    <Grid x:Name="ABBg" Tapped="TsTapped">
        <Grid.RenderTransform>
            <ScaleTransform x:Name="AnGridScaleTransform3" CenterX="25" CenterY="25"/>
        </Grid.RenderTransform>
        <!--<Rectangle Fill="Red" x:Name="anm" Opacity="0" RadiusX="100" RadiusY="100">
            <Rectangle.RenderTransform>
                <ScaleTransform x:Name="AnGridScaleTransform" CenterX="25" CenterY="25"/>
            </Rectangle.RenderTransform>
        </Rectangle>-->
        <Grid Canvas.ZIndex="2" x:Name="Angrid" Opacity="1" Width="auto" HorizontalAlignment="Center" VerticalAlignment="Center" CornerRadius="{Binding ElementName=ab,Path=ActualWidth}" Background="{StaticResource ABColorA}">
            <Grid.RenderTransform>
                <ScaleTransform x:Name="AnGridScaleTransform" CenterX="25" CenterY="25"/>
            </Grid.RenderTransform>
        </Grid>
        <Grid Canvas.ZIndex="2" x:Name="Angrid2" Opacity="1" Width="auto" HorizontalAlignment="Center" VerticalAlignment="Center" CornerRadius="{Binding ElementName=ab,Path=ActualWidth}" Background="{StaticResource ABColorB}">
            <Grid.RenderTransform>
                <ScaleTransform x:Name="AnGridScaleTransform2" CenterX="25" CenterY="25"/>
            </Grid.RenderTransform>
        </Grid>
        <TextBlock x:Name="textblock_icon" Text="{Binding ElementName=ab,Path=Icon}" Style="{StaticResource system_iconfont}" HorizontalAlignment="Center" VerticalAlignment="Center"/>
    </Grid>

　　要注意修改的部分1是

{Binding ElementName=ab,Path=Icon}这里绑定了一个文本数据，就是iconfont图标u码，用你喜欢的方式改就行了，还有2是要改

{StaticResource ABColorA}

{StaticResource ABColorB}引用了资源字典，就是内圆颜色和外圆的颜色而已。

后台代码就一个处理事件：

分别负责设置动画GRID的宽高和中心点

private void TsTapped(object sender, TappedRoutedEventArgs e)
        {
            Angrid.Opacity = 1;

            Angrid.Width = this.ActualWidth;
            Angrid.Height = this.ActualHeight;

            Angrid.CornerRadius = new CornerRadius(this.ActualWidth);
            AnGridScaleTransform.CenterX = this.ActualWidth / 2;
            AnGridScaleTransform.CenterY = this.ActualHeight / 2;

            Angrid2.Opacity = 1;

            Angrid2.Width = this.ActualWidth;
            Angrid2.Height = this.ActualHeight;

            Angrid2.CornerRadius = new CornerRadius(this.ActualWidth);
            AnGridScaleTransform2.CenterX = this.ActualWidth / 2;
            AnGridScaleTransform2.CenterY = this.ActualHeight / 2;

            AnGridScaleTransform3.CenterX = this.ActualWidth / 2;
            AnGridScaleTransform3.CenterY = this.ActualHeight / 2;
            if (Animation == 0)
            {

            }
            else
            {

            }//启动动画
            Storyboard.Begin();
        }

　　this.close();