How can i get a callback for a long press event performed on button

I am trying to get some way to get callback on long press event. I don't know if there is any support provided by the IPHONE sdk for this.

Do i have to design this functionality开发者_如何学JAVA by my own or is there anything i am missing to do it.

---

iOS 3.2 and later supports UILongPressGestureRecognizer (documentation).