IOS UIWebView 的缩放问题

通过下面一段代码可以实现webView的缩放以及获取网页的标题

- (void)webViewDidFinishLoad:(UIWebView *)webView {    //获取网页title    NSString *htmlTitle = @"document.title";    NSString *titleHtmlInfo = [webView stringByEvaluatingJavaScriptFromString:htmlTitle];    self.title = titleHtmlInfo;    //强制网页支持缩放    [self.webView stringByEvaluatingJavaScriptFromString:@"var element = document.createElement('meta');  element.name = \"viewport\";  element.content = \"width=device-width,initial-scale=1.0,minimum-scale=0.5,maximum-scale=3,user-scalable=1\"; var head = document.getElementsByTagName('head')[0]; head.appendChild(element);"];}