如何在没有uiwebview的情况下在iphone中渲染SVG图像？

import WebKit

let webView = WKWebView(frame: CGRect(x: 0, y: 0, width: 320, height: 480))
view.addSubview(webView)

let svgString = "<svg width=\"100\" height=\"100\<circle cx=\"50\" cy=\"50\" r=\"40\" stroke=\"green\" stroke-width=\"4\" fill=\"yellow\"/></svg>"
webView.loadHTMLString(svgString, baseURL: nil)

import SwiftSVG

let svgURL = Bundle.main.url(forResource: "example", withExtension: "svg")!
let svg = try! SVGParser.parse(url: svgURL)

let imageView = UIImageView(frame: CGRect(x: 0, y: 0, width: 320, height: 480))
imageView.image = svg.image(size: imageView.frame.size)

view.addSubview(imageView)

import UIKit

class SVGView: UIView {
    override func draw(_ rect: CGRect) {
        guard let context = UIGraphicsGetCurrentContext() else { return }

        context.setFillColor(UIColor.yellow.cgColor)
        context.fillEllipse(in: CGRect(x: 50, y: 50, width: 100, height: 100))

        context.setStrokeColor(UIColor.green.cgColor)
        context.setLineWidth(4)
        context.strokeEllipse(in: CGRect(x: 50, y: 50, width: 100, height: 100))
    }
}

let svgView = SVGView(frame: CGRect(x: 0, y: 0, width: 320, height: 480))
view.addSubview(svgView)