在Swift 3

Question

我正在尝试访问Swift 3中的UIWebView的URL。以下是我用来完成此操作的代码（我的webview的名称是RootView）：

let currentURL : NSString = RootView.request?.URL?.absoluteString

但是，我收到错误消息＆＃34;类型＆＃39; URLRequest＆＃39;没有会员＆＃39; URL＆＃39;＆＃34;这阻止我编译。我知道以前的堆栈溢出用户已成功使用同一行代码，所以我不确定是什么阻止我也获取URL。问题可能在于苹果公司对Swift 3的改变吗？谢谢！

这是我完整的ViewController.swift文件，我把这段代码放在了：

import UIKit

class ViewController: UIViewController, UIWebViewDelegate {

    @IBOutlet weak var RootView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.RootView.delegate = self
        let url1 = URL (string: "https://www.google.com")!
        RootView.loadRequest(URLRequest(url: url1))
        RootView.scrollView.isScrollEnabled = true
        RootView.isUserInteractionEnabled = true
        let currentURL : NSString = RootView.request?.URL?.absoluteString
        print(currentURL)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

Answer 1

尝试删除＆＃34;请求＆＃34;，并使用以下内容：

let currentURL：NSString = RootView.URL？.absoluteString

Answer 2

您有三种方法可以访问网址

let currentURL : String? = RootView.request?.mainDocumentURL?.absoluteString
let currentURL : String? = RootView.request?.url?.absoluteString
let currenturl : String? = RootView.stringByEvaluatingJavaScript(from: "window.location.href")

但所有这三个值都会返回nil，因为请求需要时间，他们不会准备好直到请求完成。试一试。

import UIKit

class URLResearchVC: UIViewController , UIWebViewDelegate {

    @IBOutlet weak var RootView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()
        self.RootView.delegate = self
        let url1 = URL (string: "https://www.google.com")!
        RootView.loadRequest(URLRequest(url: url1))
        RootView.scrollView.isScrollEnabled = true
        RootView.isUserInteractionEnabled = true
        let currentURL : String? = RootView.request?.mainDocumentURL?.absoluteString
        let currentUrl : String? = RootView.request?.url?.absoluteString
        let currenturl : String? = RootView.stringByEvaluatingJavaScript(from: "window.location.href")
        print(currentURL)
        print(currentUrl)
        print(currenturl)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func webViewDidStartLoad(_ webView: UIWebView) {
        print("-------")
        print(webView.request?.mainDocumentURL)
        print("-------")
        print(webView.request?.url?.absoluteString)
        print("-------")
        print(webView.stringByEvaluatingJavaScript(from: "window.location.href"))
    }
    func webViewDidFinishLoad(_ webView: UIWebView) {
        print("-------")
        print(webView.request?.mainDocumentURL)
        print("-------")
        print(webView.request?.url?.absoluteString)
        print("-------")
        print(webView.stringByEvaluatingJavaScript(from: "window.location.href"))
    }
}