UIWebView 禁止长按复制粘贴

直接上代码：

- (void)webViewDidFinishLoad:(UIWebView *)webView {
    // Disable user selection
    [webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitUserSelect='none';"];
    // Disable callout
    [webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.style.webkitTouchCallout='none';"];
}