How can you add a UIGestureRecognizer to a UIBarButtonItem as in the common undo/redo UIPopoverController scheme on iPad apps?

Question

Problem

In my iPad app, I cannot attach a popover to a button bar item only after press-and-hold events. But this seems to be standard for

Answer 1

This is an old question, but it still comes up in google searches, and all of the other answers are overly complicated.

I have a buttonbar, with buttonbar items, that call an action:forEvent: method when pressed.

In that method, add these lines:

bool longpress=NO;
UITouch *touch=[[[event allTouches] allObjects] objectAtIndex:0];
if(touch.tapCount==0) longpress=YES;

If it was a single tap, tapCount is one. If it was a double tap, tapCount is two. If it's a long press, tapCount is zero.