UIWebView嵌套UIScrollView 获取webVeiw页面高度

因为webView里面有 图片和表格 第一获取的高度可能不太准确需要多获取几次 每次获取不一样重新获取

- (void)updateUI{
    
    NSURL *url
    self.MainWebView.scrollView.scrollEnabled = NO;
    self.MainWebView.scalesPageToFit = YES;
    self.MainWebView.scrollView.delegate = self;
    [self.MainWebView loadRequest:[NSURLRequest requestWithURL:url]];
}

#pragma mark - webViewDelegate
- (void)webViewDidFinishLoad:(UIWebView *)webView {
    webView.scrollView.scrollEnabled = NO;
    
    CGFloat height = [[webView stringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight"] floatValue];
    DLog(@"-------网页高度--%f",height);
    if (self.WebViewHeight.constant != height && self.count <= 3) {
        self.WebViewHeight.constant = height;
        self.count++;
        [self updateUI];
    }
}