iPhone开发 - 设置UIWebView字体

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var webView: UIWebView!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let url = URL(string: "https://www.example.com")
        let request = URLRequest(url: url!)
        webView.loadRequest(request)
        
        webView.delegate = self
    }
}

extension ViewController: UIWebViewDelegate {
    func webViewDidFinishLoad(_ webView: UIWebView) {
        let fontSize = CGFloat(18)
        let fontName = "Arial"
        
        let jsString = "var elements = document.getElementsByTagName('body'); for (var i=0; i<elements.length; i++) { elements[i].style.fontFamily = '\(fontName)'; elements[i].style.fontSize = '\(fontSize)px'; }"
        
        webView.stringByEvaluatingJavaScript(from: jsString)
    }
}