How to add axis titles with DGCharts in Swift?

Question

We are updating our code to work with DGCharts v.4.0 (previously Charts) and our previously working solution (see below) for adding titles for the x and y axis is now no longer working, as "ChartUtils" cannot be found.

Does anyone know how this can be achieved with DGCharts?

`// MARK: Y-Axis titles.
private extension LineChartYAxisRenderer {
    func renderTitle(title: String, inContext context: CGContext, x: CGFloat) {
        var foregroundColor = UIColor.darkGray

        if #available(iOS 13.0, *) {
            foregroundColor = UIColor.secondaryLabel
        }
        
        let attributes: [NSAttributedString.Key: Any] = [
            .font: self.axis.labelFont,
            .foregroundColor: foregroundColor
        ]
        
        // Determine the chart title's y-position.
        let titleSize = title.size(withAttributes: attributes)
        let verticalTitleSize = CGSize(width: titleSize.height, height: titleSize.width)
        let point = CGPoint(x: x, y: ((viewPortHandler.chartHeight - verticalTitleSize.height) / 2)-30)
        
        // Render the chart title.
        ChartUtils.drawText(context: context,
                            text: title,
                            point: point,
                            attributes: attributes,
                            anchor: .zero,
                            angleRadians: .pi / -2)
    }
}`