Swift WKWebView部分重定向链接无法加载问题求助

代理代码 #

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction,
             decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
    guard let url = navigationAction.request.url,
          let scheme = url.scheme else {
              decisionHandler(.cancel)
              return
          }

    // UIApplication.shared.open(url, options: [:]) <- 可打开但不想跳转Safari
    // webView.load(URLRequest(url: url)) <- 无效
    decisionHandler(.allow) <- 无效
}

问题详情 #

• 某广告链接：调用load方法或decisionHandler(.allow)均无法加载（其他链接正常），链接内容：

  https://googleads.g.doubleclick.net/pcs/click?xai=AKAOjsulcITSmZ0z5pq-Fm4gRcby0MY3XDGdBQ9P0VcUSq5vRrRY5oquSebdiCSkVQsI3C-5KypcWh_RVVN9I62STn_vbYr6hA6UcYTpZEfw0Hm1swqBGpmD3ZJDq1QCoC_XOkNMLGXHJwm4Jk9Zjw0l9K-HsGUbzZmGRusq1qZ-yJEXVMWtDF7oBM3uayRqQ4QCsJPJHCgzl9dULq-cAQvnYG4mlM3_Lo-EenB1UXciUMthZX-qzjD0ioVHbezNjN94Ona5UdkmOg4v3ipF3RVFXO7YyPjsblSkUOI5K5VgtHi3KObSDZDtg3g2x0AAASgU8Q&sai=AMfl-YSar3L61Tu_2cYOdew53xYAKFUkSe0nXaSrK_cbcVfon6D6hUTQ7tQmArm_V2o3VspTdDNjXQ7aSCVdw1XsGfAzrbheRzyS2lgFDbfsTrTR&sig=Cg0ArKJSzBZk-HtVwUYF&fbs_aeid=%5Bgw_fbsaeid%5D&adurl=https://www.iberdrola.es/servicios/equipos/smart-solar/oferta-energia-solar-unifamiliar-comunidades&nm=1&nx=225&ny=-37&mb=1&clkt=2
  

• 某AddThis链接：甚至不会触发decidePolicyFor navigationAction方法，链接内容：

  https://www.addthis.com/bookmark.php?v=300&winname=addthis&pub=ra-62320da012f4f327&source=tbx-300&lng=es&s=whatsapp&wid=i1gy&url=https%3A%2F%2Fwww.tribunavalladolid.com%2F&title=Tribuna%20de%20Valladolid.%20Noticias%20Castilla%20y%20Le%C3%B3n.%20Noticias%20Valladolid&ate=AT-ra-62320da012f4f327/-/-/62ff3759d4f4d6bb/8&frommenu=1&ips=1&uid=62cfeb788b64c651&description=Noticias%20sobre%20Valladolid%20y%20su%20provincia.%20Deportes%2C%20sucesos%2C%20cultura%2C%20econom%C3%ADa%2C%20empresas%2C%20en%20tu%20peri%C3%B3dico%20digital%20de%20Valladolid.&uud=1&ct=1&pre=https%3A%2F%2Fwww.google.com%2F&tt=0&captcha_provider=recaptcha2&pro=0
  

注：使用UIApplication.shared.open(url, options: [:])可打开目标页面，但需求是在WKWebView内加载，不跳转Safari。

解决方案 #

广告链接加载问题处理

这类DoubleClick跳转链接依赖请求上下文（如请求头、Cookie），直接调用decisionHandler(.allow)或重新构造URLRequest会丢失关键信息，可按以下方式修改代理方法：

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction,
             decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
    guard let url = navigationAction.request.url else {
        decisionHandler(.cancel)
        return
    }
    
    // 识别广告跳转链接
    if url.host?.contains("googleads.g.doubleclick.net") == true {
        // 取消原导航，复用原请求加载（保留所有上下文）
        decisionHandler(.cancel)
        webView.load(navigationAction.request)
    } else {
        decisionHandler(.allow)
    }
}

同时确保WKWebView启用默认Cookie存储：

let config = WKWebViewConfiguration()
config.websiteDataStore = WKWebsiteDataStore.default()
let webView = WKWebView(frame: .zero, configuration: config)

AddThis链接不触发代理问题处理

AddThis链接通常通过window.open发起新窗口请求，默认不会触发decidePolicyFor navigationAction，需实现createWebViewWith代理方法拦截：

func webView(_ webView: WKWebView, createWebViewWith configuration: WKWebViewConfiguration, for navigationAction: WKNavigationAction, windowFeatures: WKWindowFeatures) -> WKWebView? {
    // 在当前webView加载新窗口请求
    if let url = navigationAction.request.url {
        webView.load(navigationAction.request)
    }
    // 返回nil表示不创建新窗口
    return nil
}

注意需确保WKWebView的navigationDelegate已正确设置，否则代理方法不会被调用。

内容的提问来源于stack exchange，提问作者user19546760