問題描述

- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler { 請問這里的 webView.URL 和 navigationAction.request.URL 有什么區(qū)別？ }- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler {請問這里的 webView.URL 和 navigationAction.request.URL 有什么區(qū)別？}

問題：1.上面代碼塊里面的問題 webView.URL 和 navigationAction.request.URL 有什么區(qū)別？2.當(dāng)我第一次加載一個網(wǎng)頁的時候，上面的代理方法為什么會被調(diào)用多次？3.如果我想攔截網(wǎng)頁的跳轉(zhuǎn)鏈接，希望通過 push 打開一個頁面重新展示一個 webview，最好是在哪個代理方法里攔截？ 遇到重定向問題怎么破？

問題解答

調(diào)多次 是不是因為url有重定向

你可以打印出來看看他們的值，看看跳轉(zhuǎn)網(wǎng)頁的時候是在哪里打印的。文檔里有關(guān)于這兩個代理的說明。

/*! @abstract Decides whether to allow or cancel a navigation. @param webView The web view invoking the delegate method. @param navigationAction Descriptive information about the action triggering the navigation request. @param decisionHandler The decision handler to call to allow or cancel the navigation. The argument is one of the constants of the enumerated type WKNavigationActionPolicy. @discussion If you do not implement this method, the web view will load the request or, if appropriate, forward it to another application. */- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;/*! @abstract Decides whether to allow or cancel a navigation after its response is known. @param webView The web view invoking the delegate method. @param navigationResponse Descriptive information about the navigation response. @param decisionHandler The decision handler to call to allow or cancel the navigation. The argument is one of the constants of the enumerated type WKNavigationResponsePolicy. @discussion If you do not implement this method, the web view will allow the response, if the web view can show it. */- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;