UIMenuController在被呈现后立即被解雇

I have subclassed UIWebView to add custom UIMenuController functionality in and it was working pretty well up until iOS 9. I am not sure what has changed, but now I am running into a situation where when I tap on a link, that should present the menu, the menu shows up briefly, but is dismissed (with no more tapping from me).I have subclassed UIWebView to add custom UIMen