绘制表盘

配置项目并添加用于实现表盘服务的类后，您便可以开始编写代码以初始化和绘制自定义表盘。

每个表盘都会创建一个渲染程序的自定义子类，用于实现绘制表盘所需的一切。

渲染程序结合使用 UserStyle、ComplicationSlotsManager 中的复杂功能信息、当前时间和其他状态信息来渲染表盘，如以下示例所示：

class CustomCanvasRenderer(
    private val context: Context,
    surfaceHolder: SurfaceHolder,
    watchState: WatchState,
    private val complicationSlotsManager: ComplicationSlotsManager,
    currentUserStyleRepository: CurrentUserStyleRepository,
    canvasType: Int
) : Renderer.CanvasRenderer(
    surfaceHolder = surfaceHolder,
    currentUserStyleRepository = currentUserStyleRepository,
    watchState = watchState,
    canvasType = canvasType,
    interactiveDrawModeUpdateDelayMillis = 16L
) {
    override fun render(canvas: Canvas, bounds: Rect, zonedDateTime: ZonedDateTime) {
        // Draw into the canvas
    }

    override fun renderHighlightLayer(canvas: Canvas, bounds: Rect, zonedDateTime: ZonedDateTime) {
        // Draw into the canvas
    }
}