小编Jip*_*orn的帖子

如何在skiashark笔划上创建一个onclick函数？我创建了一个包含多个路径的圆形图:

https://i.stack.imgur.com/ngiz6.jpg

例如绿线:

SKPaint paint4 = new SKPaint
{
    Style = SKPaintStyle.Stroke,
    IsAntialias = true,
    Color = Color.FromHex("#5bd363").ToSKColor(),                   // Overlay Colour of Radial Gauge
    StrokeWidth = progressUtils.getFactoredWidth(radialGaugeWidth + 15), // Overlay Width of Radial Gauge
    StrokeCap = SKStrokeCap.Butt                                  // Round Corners for Radial Gauge
};

SKPath path4 = new SKPath();
path4.AddArc(rect, (360 / 24) * 9.25f + 90, (float)sweepAngleSlider3.Value);
canvas.DrawPath(path4, paint4)

我如何做到这一点,当你点击一个笔画,例如绿色笔画时,会发生什么？

当我将Xamarin表单更新为3.2.0或更高版本时，出现以下错误：

Error       Position 68:29. Signature (return type) of EventHandler
"TimeToSport.Views.ItemsPage.OnCanvasViewPaintSurfaceAsync" doesn't match
the event type  TimeToSport 
E:\Xamarin Projects\TimeToSport_master\TimeToSport\TimeToSport\Views\Main\ItemsPage.xaml    68  

错误来自以下代码（xaml）：

<skia:SKCanvasView x:Name="canvas" 
 PaintSurface="OnCanvasViewPaintSurfaceAsync" 
 Grid.Row="2" 
/>

在CS文件中：

SKCanvas canvas = surface.Canvas;

当我使用Xamarin表单版本3.1.0时，我没有收到此错误，并且一切正常。但是，我必须为一些需要使用的新功能更新Xamarin表单。

如何解决此错误？

编辑：

OnCanvasViewPaintSurfaceAsync：

    async Task OnCanvasViewPaintSurfaceAsync(object sender, SKPaintSurfaceEventArgs args1)

    {
        args = args1;
        await drawGaugeAsync();

    }

public async Task drawGaugeAsync()
    {
        // Radial Gauge Constants
        int uPadding = 130;
        int side = 370;
        int radialGaugeWidth = 20;

        // Line TextSize inside Radial Gauge
        int lineSize1 = 220;
        int lineSize2 …