首先要设置WKWebView的代理

self.webView.UIDelegate = self;复制代码

实现以下三个代理方法即可

#pragma mark -- WKUIDelegate// 显示一个按钮。点击后调用completionHandler回调- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler{        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message message:nil preferredStyle:UIAlertControllerStyleAlert];    [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {        completionHandler();    }]];    [self presentViewController:alertController animated:YES completion:nil];}// 显示两个按钮，通过completionHandler回调判断用户点击的确定还是取消按钮- (void)webView:(WKWebView *)webView runJavaScriptConfirmPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(BOOL))completionHandler{        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:message message:nil preferredStyle:UIAlertControllerStyleAlert];    [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {                completionHandler(YES);    }]];    [alertController addAction:[UIAlertAction actionWithTitle:@"取消" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {                completionHandler(NO);    }]];    [self presentViewController:alertController animated:YES completion:nil];    }// 显示一个带有输入框和一个确定按钮的，通过completionHandler回调用户输入的内容- (void)webView:(WKWebView *)webView runJavaScriptTextInputPanelWithPrompt:(NSString *)prompt defaultText:(NSString *)defaultText initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(NSString * _Nullable))completionHandler{        UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:nil preferredStyle:UIAlertControllerStyleAlert];    [alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {            }];    [alertController addAction:[UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {                completionHandler(alertController.textFields.lastObject.text);    }]];    [self presentViewController:alertController animated:YES completion:nil];}复制代码