使用 WKWebView 读取本地存储数据

问题描述

我需要读取存储在 WKWbview 本地存储中的值.我尝试使用下面的代码但得到零.我能够在本地存储中写入值，但在从中读取值时遇到困难.

I need to read value stored in the local storage of WKWbview.I tried using the below code but getting nil.I am able to write values in local storage but facing difficulty in reading values from it.

  let script = "localStorage.getItem('token')"
        wkWebView.evaluateJavaScript(script) { (token, error) in
            print("token = \(token)")
        }

WKWebView 初始化代码:

WKWebView init code:

    // 1
    let accessToken = UserDefaults.standard.value(forKey: "token") as? String
    // 2
    let refreshToken = UserDefaults.standard.value(forKey: "RefreshToken") as? String
    // 3
    let configuration = WKWebViewConfiguration()
    // 4
    let contentController = WKUserContentController()
    let accessTokenScript = "javascript: localStorage.setItem('token', '\(accessToken!)')"
    // 5
    let userAccessTokenScript = WKUserScript(source: accessTokenScript, injectionTime: WKUserScriptInjectionTime.atDocumentStart, forMainFrameOnly: false)

    // 6
    contentController.addUserScript(userAccessTokenScript)
    configuration.userContentController = contentController
    self.wkWebView = WKWebView(frame: controller.view.bounds, configuration: configuration)

推荐答案

需要在网站已经加载时注入这个脚本:

You need to inject this script when the website has already loaded:

• 您的 WKWebView 需要分配 navigationDelegate

webView.navigationDelegate = self

在网站完全加载后注入脚本

inject the script when the website was loaded completely

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {

    //you might want to edit the script, with the escape characters
    let script = "localStorage.getItem(\"token\")"
    wkWebView.evaluateJavaScript(script) { (token, error) in
        if let error = error {
            print ("localStorage.getitem('token') failed due to \(error)")
            assertionFailure()
        }
        print("token = \(token)")
    }
}

这篇关于使用 WKWebView 读取本地存储数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！