iOS WKWebView 获取内容高度

//页面加载完成之后调用

• (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation { WS(weakSelf);
  [webView evaluateJavaScript:@“document.body.offsetHeight;”
  completionHandler:^(id _Nullable any, NSError * _Nullable error) {
  //这个高度有偏差 NSString *heightStr = [NSString
  stringWithFormat:@"%@",any]; NSLog(@“webHeight—%f”,heightStr);
  //加载完成 if ( ! self.webView.isLoading) {
  //重新给webView 赋高度 heightStr
  [self.webView mas_makeConstraints:^(MASConstraintMaker *make) {
  make.height.mas_equalTo(heightStr);
  }];

       NSLog(@"webHeight 实际高度---%@",NSStringFromCGSize(webView.scrollView.contentSize));
  
     weakSelf.webHeight =webView.scrollView.contentSize.height;
   }  }