将UIWebView呈现为ImageContext

import UIKit

class ViewController: UIViewController {
    let webView = UIWebView()

    override func viewDidLoad() {
        super.viewDidLoad()

        webView.frame = view.bounds
        webView.loadRequest(URLRequest(url: URL(string: "https://www.example.com")!))
        view.addSubview(webView)

        DispatchQueue.main.asyncAfter(deadline: .now() + 5.0) {
            let image = self.imageFromWebView(webView: self.webView)
            // Do something with the image
        }
    }

    func imageFromWebView(webView: UIWebView) -> UIImage {
        UIGraphicsBeginImageContextWithOptions(webView.bounds.size, false, 0.0)
        webView.drawViewHierarchyInRect(webView.bounds, afterScreenUpdates: true)
        let image = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return image
    }
}