如何从渐变层上方的"drawInRect“生成文本？

import UIKit
import CoreText

func drawTextOnGradientLayer() {
    // 创建渐变层
    let gradientLayer = CAGradientLayer()
    gradientLayer.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
    gradientLayer.colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
    
    // 创建绘制上下文
    UIGraphicsBeginImageContextWithOptions(gradientLayer.frame.size, false, 0)
    guard let context = UIGraphicsGetCurrentContext() else { return }
    
    // 创建富文本字符串
    let attributedString = NSAttributedString(string: "Hello, World!", attributes: [
        .font: UIFont.systemFont(ofSize: 20),
        .foregroundColor: UIColor.white
    ])
    
    // 创建文本框
    let framesetter = CTFramesetterCreateWithAttributedString(attributedString as CFAttributedString)
    let framePath = CGPath(rect: gradientLayer.bounds, transform: nil)
    let frame = CTFramesetterCreateFrame(framesetter, CFRangeMake(0, attributedString.length), framePath, nil)
    
    // 绘制文本框
    CTFrameDraw(frame, context)
    
    // 获取绘制结果
    guard let image = UIGraphicsGetImageFromCurrentImageContext() else { return }
    UIGraphicsEndImageContext()
    
    // 将渐变层绘制到目标视图上
    gradientLayer.contents = image.cgImage
    
    // 添加渐变层到目标视图
    let targetView = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
    targetView.layer.addSublayer(gradientLayer)
}