如何在UIWebView加載請求之前設置sessionStorage？

Question

碼

這是我一直在嘗試做的事情：

import UIKit
import WebKit

class WebViewViewController: UIViewController {
    @IBOutlet weak var webView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = NSURL(string: "http://example.com/index.html")
        webView.stringByEvaluatingJavaScript(from: "sessionStorage.setItem('exampleKey','exampleValue');")
        let request = URLRequest(url: url! as URL)
        webView.loadRequest(request)
    }
}

問題

但是，在Safari中為Simulator查找控制台時，sessionStorage不包含exampleKey 。

題

如何在加載http://example.com/index.html之前設置sessionStorage？

編輯

Alexandre Lara提出的解決方案對我不起作用。

import UIKit
import WebKit

class WebViewViewController: UIViewController, UIWebViewDelegate {
    @IBOutlet weak var webView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let url = NSURL(string: "http://example.com/index.html")
        let request = URLRequest(url: url! as URL)
        webView.delegate = self
        webView.loadRequest(request)
    }

    func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) -> Bool {
        webView.stringByEvaluatingJavaScript(from: "sessionStorage.setItem('exampleKey','exampleValue');")
        return true
    }
}

Answer 1

您可以通過從UIWebViewDelegate實現webView(_:shouldStartLoadWith:navigationType:)來解決此問題：

class WebViewViewController: UIViewController, UIWebViewDelegate {
    // ...
    let url = NSURL(string: "http://example.com/index.html")
    let request = URLRequest(url: url! as URL)
    webView.loadRequest(request)
    // ...

    // Set delegate and implement the method
    webView.delegate = self

    func webView(_ webView: UIWebView, shouldStartLoadWith request: URLRequest, navigationType: UIWebViewNavigationType) {
        webView.stringByEvaluatingJavaScript(from: "sessionStorage.setItem('exampleKey','exampleValue');")
    }
}