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@aryamansharda
Created February 19, 2023 20:40
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Creating PDFs From WKWebView
//
// ViewController.swift
// WebKitPDFAndImageDemo
//
// Created by Aryaman Sharda on 2/18/23.
//
import UIKit
import WebKit
class ViewController: UIViewController {
private lazy var webView: WKWebView = {
// We'll go ahead and use the default configuration here. Some cool options here, but not in scope.
let webView = WKWebView(frame: .zero, configuration: WKWebViewConfiguration())
// This will be used to determine when the web page has fully loaded.
webView.navigationDelegate = self
view.addSubview(webView)
webView.pinToSuperview()
return webView
}()
override func viewDidLoad() {
super.viewDidLoad()
loadURL(from: "https://www.digitalbunker.dev")
}
private func loadURL(from string: String) {
guard let url = URL(string: string) else {
return
}
webView.load(URLRequest(url: url))
}
private func saveAsPDF(title: String?) {
let pdfConfiguration = WKPDFConfiguration()
/// Using `webView.scrollView.frame` allows us to capture the entire page, not just the visible portion
pdfConfiguration.rect = CGRect(x: 0, y: 0, width: webView.scrollView.contentSize.width, height: webView.scrollView.contentSize.height)
webView.createPDF(configuration: pdfConfiguration) { result in
switch result {
case .success(let data):
guard let downloadsDirectory = FileManager.default.urls(for: .downloadsDirectory, in: .userDomainMask).first else {
return
}
do {
let savePath = downloadsDirectory.appendingPathComponent(title ?? "PDF").appendingPathExtension("pdf")
try data.write(to: savePath)
print("Successfully created and saved PDF at \(savePath)")
} catch let error {
print("Could not save pdf due to \(error.localizedDescription)")
}
case .failure(let failure):
print(failure.localizedDescription)
}
}
}
}
extension ViewController: WKNavigationDelegate {
func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
// The web view has finished loading the resource, we can now create a PDF
saveAsPDF(title: webView.title)
}
}
extension UIView {
func pinToSuperview() {
guard let superview else { return }
translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
topAnchor.constraint(equalTo: superview.topAnchor),
bottomAnchor.constraint(equalTo: superview.bottomAnchor),
leadingAnchor.constraint(equalTo: superview.leadingAnchor),
trailingAnchor.constraint(equalTo: superview.trailingAnchor)
])
}
}
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