webview高度自适应

-(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, SCREEN_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('body')[0]).getPropertyValue('margin-bottom'))"];    float webHeight = [height_str floatValue];    //内容实际高度（像素）* 点和像素的比    webHeight = webHeight * frame.height / clientheight;    //再次设置WebView高度（点）    webView.frame = CGRectMake(0, 0, self.view.frame.size.width, height);}