TypingThrottler

TypingThrottler.swift

import Foundation

final class TypingThrottler {
  typealias Handler = (String) -> Void
  let interval: TimeInterval
  let handler: Handler

  private var workItem: DispatchWorkItem?

  // handler will be called after the user has stopped typing for the given `interval` (seconds)
  init(interval: TimeInterval = 0.4, handler: @escaping Handler) {
    self.interval = interval
    self.handler = handler
  }

  // call this every time the text changes
  func handleTyping(with text: String) {
    workItem?.cancel()
    workItem = DispatchWorkItem { [weak self] in
      self?.handler(text)
    }
    if let workItem = self.workItem {
      DispatchQueue.main.asyncAfter(deadline: .now() + interval, execute: workItem)
    }
  }
}