/**
 *  根據webView、navigationAction相關資訊決定這次跳轉是否可以繼續進行,這些資訊包含HTTP傳送請求，如頭部包含User-Agent,Accept,refer
 *  在傳送請求之前，決定是否跳轉的代理
 *  @param webView
 *  @param navigationAction
 *  @param decisionHandler
 */
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{
    decisionHandler(WKNavigationActionPolicyAllow);
}

/**
 *  這個代理方法表示當客戶端收到伺服器的響應頭，根據response相關資訊，可以決定這次跳轉是否可以繼續進行。
 *  在收到響應後，決定是否跳轉的代理
 *  @param webView
 *  @param navigationResponse
 *  @param decisionHandler
 */
- (void)webView:(WKWebView *)webView decidePolicyForNavigationResponse:(WKNavigationResponse *)navigationResponse decisionHandler:(void (^)(WKNavigationResponsePolicy))decisionHandler{
    decisionHandler(WKNavigationResponsePolicyAllow);
}

/**
 *  準備載入頁面。等同於UIWebViewDelegate: - webView:shouldStartLoadWithRequest:navigationType
 *
 *  @param webView
 *  @param navigation
 */
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation{
}

/**
 *  這個代理是伺服器redirect時呼叫
 *  接收到伺服器跳轉請求的代理
 *  @param webView
 *  @param navigation
 */
- (void)webView:(WKWebView *)webView didReceiveServerRedirectForProvisionalNavigation:(null_unspecified WKNavigation *)navigation{

}

- (void)webView:(WKWebView *)webView didFailProvisionalNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error{

}

/**
 *  內容開始載入. 等同於UIWebViewDelegate: - webViewDidStartLoad:
 *
 *  @param webView
 *  @param navigation
 */
- (void)webView:(WKWebView *)webView didCommitNavigation:(null_unspecified WKNavigation *)navigation{

}

/**
 *  頁面載入完成。 等同於UIWebViewDelegate: - webViewDidFinishLoad:
 *
 *  @param webView
 *  @param navigation
 */
- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation{

}

/**
 *  頁面載入失敗。 等同於UIWebViewDelegate: - webView:didFailLoadWithError:
 *
 *  @param webView
 *  @param navigation
 *  @param error      
 */
- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error{

}

- (void)webViewWebContentProcessDidTerminate:(WKWebView *)webView NS_AVAILABLE(10_11, 9_0){

}

/*
 我們看看WKUIDelegate的幾個代理方法，雖然不是必須實現的，但是如果我們的頁面中有呼叫了js的alert、confirm、prompt方法，我們應該實現下面這幾個代理方法，然後在原來這裡呼叫native的彈出窗，因為使用WKWebView後，HTML中的alert、confirm、prompt方法呼叫是不會再彈出視窗了，只是轉化成ios的native回撥代理方法
 */
#pragma mark - WKUIDelegate

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{
    UIAlertController *alertView = [UIAlertController alertControllerWithTitle:@"h5Container" message:message preferredStyle:UIAlertControllerStyleAlert];
//    [alertView addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
//        textField.textColor = [UIColor redColor];
//    }];
    [alertView addAction:[UIAlertAction actionWithTitle:@"我很確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
        completionHandler();
    }]];
    [self presentViewController:alertView animated:YES completion:nil];
}