WKWebView Completion handler passed to -[WebViewVC webView:runJavaScriptAlertPanelWithMessage:initi

WKWebView 获取js弹框报错

Completion handler passed to 
-[WebViewVC webView:runJavaScriptAlertPanelWithMessage:initiatedByFrame:completionHandler:] 
was not called

原因

For user security, your app should call attention to the fact
 that a specific website controls the content in this panel. A simple forumla
 for identifying the controlling website is frame.request.URL.host.
 The panel should have a single OK button.
 谷歌翻译:
 为了用户安全，您的应用应引起注意
  特定网站控制此面板中的内容。 一个简单的论坛
  用于标识控制网站的是frame.request.URL.host。
  该面板应具有一个“确定”按钮。

简而言之就是:
苹果要求显示js的弹框(比如alert())必须在
代理方法 runJavaScriptAlertPanelWithMessage:里面 调用completionHandler() block
也就是说在你自定义的alertView 中必须要执行completionHandler()

比如

- (void)webView:(WKWebView *)webView runJavaScriptAlertPanelWithMessage:(NSString *)message initiatedByFrame:(WKFrameInfo *)frame completionHandler:(void (^)(void))completionHandler
{
    TYAlertView *alertView = [TYAlertView alertViewWithTitle:@"TYAlertView" message:@"This is a message, the alert view containt text and textfiled. "];
    
    [alertView addAction:[TYAlertAction actionWithTitle:@"取消" style:TYAlertActionStyleCancle handler:^(TYAlertAction *action) {
        NSLog(@"%@",action.title);
        completionHandler();
    }]];

    [alertView addAction:[TYAlertAction actionWithTitle:@"确定" style:TYAlertActionStyleDestructive handler:^(TYAlertAction *action) {
        NSLog(@"%@",action.title);
        completionHandler();
    }]];
    
    [alertView addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"请输入账号";
    }];
    [alertView addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = @"请输入密码";
    }];
    
    // first way to show
    TYAlertController *alertController = [TYAlertController alertControllerWithAlertView:alertView preferredStyle:TYAlertControllerStyleAlert];
    //alertController.alertViewOriginY = 60;
    [self presentViewController:alertController animated:YES completion:nil];
}