jwrigh26

import {useEffect} from 'react';

export default function useScrollListener(callback = () => {}, ms = 150) {
  let onFinishedId;
  let scrollStarted = false;
  let scrollDirection = 'down';
  let scrollTop = 0;
  let prevScrollTop = scrollTop;

  useEffect(() => {

jwrigh26

import {useState, useEffect, useCallback} from 'react';

export function useLongPress(callback = () => {}, ms = 400) {
  const [startLongPress, setStartLongPress] = useState(false);

  useEffect(() => {
    let timerId;
    if (startLongPress) {
      timerId = setTimeout(callback, ms);
    } else {

jwrigh26

import {useReducer} from 'react';

export const rowAction = {
  add: 'ACTION_ADD',
  approve: 'ACTION_APPROVE',
  edit: 'ACTION_EDIT',
  note: 'ACTION_NOTE',
  reset: 'ACTION_RESET',
};

jwrigh26

##Creating a timer with Grand Central Dispatch

At the following is the implementation file of a sample class that shows, how to make a timer with the help of Grand Central Dispatch. The timer fires on a global queue, just change the queue to the main queue or any custom queue and the timer fires on this queue and not on the global queue anymore.

This was modified for swift 2.2 Also created an example of a background global queue variable. As well as a callback in the start timer so you can do some cool stuff everytime the timer is called.