如何在ios-charts中更改PieChart中的CenterText字体？

import UIKit
import Charts

class CustomPieChartRenderer: PieChartRenderer {
    private var customFont: UIFont

    init(chart: PieChartView, animator: Animator, viewPortHandler: ViewPortHandler, customFont: UIFont) {
        self.customFont = customFont
        super.init(chart: chart, animator: animator, viewPortHandler: viewPortHandler)
    }

    override func drawCenterText(context: CGContext) {
        guard let centerText = self.chart.centerText else { return }

        let center = CGPoint(x: self.chart.center.x, y: self.chart.center.y)
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.alignment = .center

        let attributes: [NSAttributedString.Key: Any] = [
            .font: customFont,
            .paragraphStyle: paragraphStyle
        ]

        centerText.draw(with: CGRect(x: center.x - centerText.size().width / 2, y: center.y - centerText.size().height / 2, width: centerText.size().width, height: centerText.size().height), options: [.usesLineFragmentOrigin], attributes: attributes, context: nil)
    }
}

class CustomPieChartView: PieChartView {
    var customFont: UIFont?

    override func initialize() {
        super.initialize()
        if let customFont = customFont {
            renderer = CustomPieChartRenderer(chart: self, animator: self.animator, viewPortHandler: self.viewPortHandler, customFont: customFont)
        }
    }
}

// 使用示例
let pieChartView = CustomPieChartView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))
pieChartView.customFont = UIFont(name: "Arial-BoldMT", size: 16)
// 设置其他图表数据和属性