如何在Swift中创建渐变圆形路径

import UIKit
import CoreGraphics

class GradientCircleView: UIView {
    override func draw(_ rect: CGRect) {
        // 实现渐变圆形路径的绘制
    }
}

override func draw(_ rect: CGRect) {
    // 获取当前绘图上下文
    guard let context = UIGraphicsGetCurrentContext() else { return }
    
    // 创建渐变色
    let colors = [UIColor.red.cgColor, UIColor.blue.cgColor]
    let colorSpace = CGColorSpaceCreateDeviceRGB()
    let colorLocations: [CGFloat] = [0.0, 1.0]
    guard let gradient = CGGradient(colorsSpace: colorSpace, colors: colors as CFArray, locations: colorLocations) else { return }
    
    // 设置渐变的起始点和终止点
    let startPoint = CGPoint(x: rect.midX, y: rect.minY)
    let endPoint = CGPoint(x: rect.midX, y: rect.maxY)
    
    // 设置渐变的半径
    let radius = rect.width / 2.0
    
    // 创建渐变圆形路径
    let path = UIBezierPath(arcCenter: CGPoint(x: rect.midX, y: rect.midY), radius: radius, startAngle: 0, endAngle: CGFloat.pi * 2, clockwise: true)
    
    // 将路径添加到上下文中
    context.addPath(path.cgPath)
    
    // 使用剪切路径，以便只在路径内部绘制渐变
    context.clip()
    
    // 在路径内部绘制渐变
    context.drawLinearGradient(gradient, start: startPoint, end: endPoint, options: [])
}

let gradientCircleView = GradientCircleView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
view.addSubview(gradientCircleView)