计算UIWebView加载的网页内容高度

key code

- (void)webViewDidFinishLoad:(UIWebView *)aWebView{
    CGRect frame = aWebView.frame;
    frame.size.height = 1;
    aWebView.frame = frame;
    CGSize fittingSize = [aWebView sizeThatFits:CGSizeZero];
    frame.size = fittingSize;
    aWebView.frame = frame;

    NSLog(@"size: %f, %f", fittingSize.width, fittingSize.height);
    _webViewHeight=fittingSize.height;
    [_tableView reloadData];
}