cancelling queued performSelector:afterDelay calls

[NSObject cancelPreviousPerformRequestsWithTarget:]

or

[NSObject cancelPreviousPerformRequestsWithTarget:selector:object:]

The target is the original object on which performSelector:afterDelay: was called.

For example:

// schedule the selector
[self performSelector:@selector(mySel:) withObject:nil afterDelay:5.0];
// cancel the above call (and any others on self)
[NSObject cancelPreviousPerformRequestsWithTarget:self];

See apple docs, it's right at the end of the performSelector:withObject:afterDelay: description.

If you are looking for "performSelector" to have its matching "cancelPreviousPerformSelector"... it doesn't. (Ugh, Apple, why do you do that to me???)

The, er, ah, "matching" methods are:

performSelector

cancelPreviousPerformRequestsWithTarget

(Just to make it extra hard to remember, without searching the docs.)

In order to cancel all previous perform requests, you may use :

[NSObject cancelPreviousPerformRequestsWithTarget:self];