ios webview自适应高度及关闭回弹效果

/////////////////////////////初始化,self.view是父控件/////////////////////////////////
  _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('body')[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);
}



关闭webvieew回弹效果代码
 [(UIScrollView *)[[_webView subviews] objectAtIndex:0] setBounces:NO];

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