//第一种方法
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
   CGFloat webViewHeight=[webView.scrollView contentSize].height;
    
    CGRect newFrame = webView.frame;
    newFrame.size.height = webViewHeight;
    webView.frame = newFrame;
    _webTablewView.contentSize = CGSizeMake(320, newFrame.size.height + 64 + KWIDTH - 100);

}

//2.执行js语句 直接获取html文档的dom高度
- (void)webViewDidFinishLoad:(UIWebView *)webView{
 
CGFloatwebViewHeight =[[webViewstringByEvaluatingJavaScriptFromString:@"document.body.offsetHeight"]floatValue];
// CGFloat webViewHeight= [[webViewstringByEvaluatingJavaScriptFromString:@"document.body.scrollHeight"]floatValue];
CGRectnewFrame = webView.frame;
newFrame.size.height= webViewHeight;
webView.frame= newFrame;
}
//方法3.先将UIWebView的高度设为最小，然后再使用sizeThatFits就会返回刚好合适的大小
-(void)webViewDidFinishLoad:(UIWebView*)webVie{
    CGSize actualSize = [webView sizeThatFits:CGSizeZero];
    CGRect newFrame = webView.frame;
    newFrame.size.height = actualSize.height;
    webView.frame = newFrame;
}
//方法4.遍历webview子视图 获取UIWebDocumentView高度即实际高度
-(void)webViewDidFinishLoad:(UIWebView *)webView{
    CGFloat webViewHeight = 0.0f;
    
    if([webView.subviews count] > 0)
    {
        UIView *scrollerView = webView.subviews[0];
        
        if([scrollerView.subviews count] >
             0)
        {
            UIView *webDocView = scrollerView.subviews.lastObject;
            if ([webDocView isKindOfClass:[NSClassFromString(@"UIWebDocumentView")class]])
            {
                webViewHeight = webDocView.frame.size.height;//获取文档的高度
                
                webView.frame=webDocView.frame;
                
                //更新UIWebView 的高度
            }
            
        }
    }
}