iOS的WebView自适应内容高度

//_webView = [[UIWebView alloc] initWithFrame: CGRectMake(0, 0, self.view.frame.size.width, 0)];_webView.delegate = self;_webView.scrollView.bounces = NO;_webView.scrollView.showsHorizontalScrollIndicator = NO;_webView.scrollView.scrollEnabled = NO;[_webView sizeToFit];///////////////////////////////设置内容，这里包装一层div，用来获取内容实际高度（像素），htmlcontent是html格式的字符串//////////////NSString * htmlcontent = [NSString stringWithFormat:@"<div id=\"webview_content_wrapper\">%@</div>", htmlcontent];[_webView loadHTMLString:htmlcontent baseURL:nil];////////////////////////////////delegate的方法重载////////////////////////////////////////////- (void)webViewDidFinishLoad:(UIWebView *)webView{//获取页面高度（像素）NSString * clientheight_str = [webView stringByEvaluatingJavaScriptFromString: @"document.body.offsetHeight"];float clientheight = [clientheight_str floatValue];//设置到WebView上webView.frame = CGRectMake(0, 0, self.view.frame.size.width, clientheight);//获取WebView最佳尺寸（点）CGSize frame = [webView sizeThatFits:webView.frame.size];//获取内容实际高度（像素）NSString * height_str= [webView stringByEvaluatingJavaScriptFromString: @"document.getElementById('webview_content_wrapper').offsetHeight + parseInt(window.getComputedStyle(document.getElementsByTagName('body')[0]).getPropertyValue('margin-top'))  + parseInt(window.getComputedStyle(document.getElementsByTagName('bod4000y')[0]).getPropertyValue('margin-bottom'))"];float height = [height_str floatValue];//内容实际高度（像素）* 点和像素的比height = height * frame.height / clientheight;//再次设置WebView高度（点）webView.frame = CGRectMake(0, 0, self.view.frame.size.width, height);}