Cancel a timed event in Swift?

Update for Swift 3.0

Set Perform Selector

perform(#selector(foo), with: nil, afterDelay: 2)

foo method will call after 2 seconds

 func foo()
 {
         //do something
 }

To cancel pending method call

 NSObject.cancelPreviousPerformRequests(withTarget: self)

Swift 3 has DispatchWorkItem:

let task = DispatchWorkItem { print("do something") }

// execute task in 2 seconds
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 2, execute: task)

// optional: cancel task
task.cancel()