UISearchBar detect when user stop type in swift

Question

Most of the example I found is in Objective - C which is very hard for me to understand can someone provide an example regarding this question in Swift. Here is one solution but it is in Objective C.

Answer 1

func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
    print("after every text gets changed")
    timer.invalidate()
    timer = NSTimer.scheduledTimerWithTimeInterval(5, target: self, selector: #selector(ViewController.output), userInfo: searchText, repeats: false)
}

func output(){
    print("hello")
    if timer.userInfo != nil {
        print(timer.userInfo)
    }
    timer.invalidate()
}