UIWebViewDelegate

UIWebViewNavigationType{
UIWebViewNavigationTypeLinkClicked，點擊鏈接
UIWebViewNavigationTypeFormSubmitted挪拟，提交表單
UIWebViewNavigationTypeBackForward挨务，點擊前進或返回按鈕
UIWebViewNavigationTypeReload，點擊重新加載按鈕
UIWebViewNavigationTypeFormResubmitted玉组，重復提交表單
UIWebViewNavigationTypeOther谎柄，發(fā)生其它行為
}
  __TVOS_PROHIBITED @protocol UIWebViewDelegate <NSObject>
    @optional
//詢問是否允許加載頁面請求。UIWebViewNavigationType是個枚舉惯雳。 可以通過判斷不同的枚舉值拿到事件朝巫，進行操作。
    - (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;
//頁面開始加載
    - (void)webViewDidStartLoad:(UIWebView *)webView;
//頁面加載完成
    - (void)webViewDidFinishLoad:(UIWebView *)webView;
//頁面加載失敗
    - (void)webView:(UIWebView *)webView didFailLoadWithError:(nullable NSError *)error;

    @en

WKWebView的WKNavigationDelegate比uiwebViewdelegate更加細化

@protocol WKNavigationDelegate <NSObject>

@optional
//請求之前石景，決定是否要跳轉:用戶點擊網(wǎng)頁上的鏈接捍歪，需要打開新頁面時，將先調用這個方法鸵钝。
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler;
//接收到相應數(shù)據(jù)后糙臼，決定是否跳轉
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler;
//頁面開始加載時調用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation;
// 主機地址被重定向時調用
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation;
// 頁面加載失敗時調用
- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;
// 當內(nèi)容開始返回時調用
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation;
// 頁面加載完畢時調用
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation;
//跳轉失敗時調用
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error;
// 如果需要證書驗證，與使用AFN進行HTTPS證書驗證是一樣的
- (void)webView:(WKWebView *)webView didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition, NSURLCredential *__nullable credential))completionHandler;
//9.0才能使用恩商，web內(nèi)容處理中斷時會觸發(fā)
- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView NS_AVAILABLE(10_11, 9_0);

@end