wkWebView 的js交互
与js交互

/// 5 页面加载完成之后调用

• (void)webView:(WKWebView )webView didFinishNavigation:(WKNavigation)navigation;
  {

  // 直接调用js
  [self.webViewevaluateJavaScript:@"document.documentElement.style.webkitUserSelect='none';"completionHandler:nil];
  // 调用js参数
  [self.webViewevaluateJavaScript:@"document.documentElement.style.webkitTouchCallout='none';"completionHandler:nil];
  [self.showViewremoveFromSuperview];
  NSString *jsToGetHTMLSource =@"document.getElementsByTagName('html')[0].innerHTML";
  [self.activityViewstopAnimating];
  // 调用js获取返回值
  [self.webViewevaluateJavaScript:jsToGetHTMLSourcecompletionHandler:^(id_Nullable HTMLSource, NSError * _Nullable error) {
  NSRange range = [HTMLSourcerangeOfString:@"Bad Gateway"];//判断字符串是否包含
  bool urlIsTrue = (range.location ==NSNotFound);
  if (urlIsTrue ==true ) {
  range = [HTMLSource rangeOfString:@"Network is unreachable"];
  urlIsTrue = (range.location ==NSNotFound);
  }

    if (urlIsTrue ==true ) {
        range = [HTMLSource rangeOfString:@"页面不存在"];
        urlIsTrue = (range.location ==NSNotFound);
    }
    if (urlIsTrue ==true) {
        range = [HTMLSource rangeOfString:@"网页无法访问"];
        urlIsTrue = (range.location ==NSNotFound);
    }
    if (urlIsTrue ==true) {
        range = [HTMLSource rangeOfString:@"Not Found"];
        urlIsTrue = (range.location ==NSNotFound);
    }
    //网页可访问隐藏我们自己的返回按钮
    if (urlIsTrue==true)
    {
        self.topView.hidden =YES;
    }
    else
    {
        [webView stopLoading];
        [selfaddShowView];
    }
  

  }];
  [webView stopLoading];

}