A simple class to debounce swift method, something like JavaScript debounce function
Switch branches/tags
Nothing to show
Clone or download
Latest commit bba65ef May 23, 2017
Failed to load latest commit information.
Debouncer.swift Update to Swift 3 syntax Feb 16, 2017
README.md Update README.md May 22, 2017


Debouncer Class

// file: Debouncer.swift
import Foundation

class Debouncer: NSObject {
    var callback: (() -> ())
    var delay: Double
    weak var timer: Timer?

    init(delay: Double, callback: @escaping (() -> ())) {
        self.delay = delay
        self.callback = callback

    func call() {
        let nextTimer = Timer.scheduledTimer(timeInterval: delay, target: self, selector: #selector(Debouncer.fireNow), userInfo: nil, repeats: false)
        timer = nextTimer

    func fireNow() {


let debouncedFunction = Debouncer(delay: 0.40) {
    print("delayed printing")


It works like JavaScript's debounce function, for example http://modernjavascript.blogspot.com/2013/08/building-better-debounce.html

About Debounce

The debounce function is an extremely useful tool that can help throttle requests. It is different to throttle though as throttle will allow only one request per time period, debounce will not fire immediately and wait the specified time period before firing the request. If there is another request made before the end of the time period then we restart the count. This can be extremely useful for calling functions that often get called and are only needed to run once after all the changes have been made.