調多次 是不是因為url有重定向

你可以列印出來看看他們的數值，看看跳轉網頁的時候是在哪裡列印的。
文檔裡有關於這兩個代理的說明。

/*! @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;