Start a timer when Object is created

Question

I like a timer to start when an object is created. (see code below in playground). My problem is the timer seem to never start.

How can I start a timer when a Object is created?

import Foundation

class Test {
    var counter = 60
    var timer = Timer()
    init() {
        timer = .scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(updateCounter), userInfo: nil, repeats: true)
    }
    @objc func updateCounter() {
        // example functionality
        if counter > 0 {
            counter -= 1
            print(counter)
        } else {
            counter = 60
        }
    }
}

var newTest = Test()

Leo Dabus · Accepted Answer · 2023-03-10 21:21:45Z

2

What you need is to import PlaygroundSupport and set playground page needsIndefiniteExecution to true

import PlaygroundSupport
PlaygroundPage.current.needsIndefiniteExecution = true

answered Mar 10, 2023 at 21:21

Leo Dabus

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2 Comments

Duncan C Over a year ago

This is indeed the correct answer, (voted) but we should tell people why. Normally, playgrounds run top to bottom and then stop. Thus the timer is created but the playground code stops running before it can fire. By setting the playground page's needsIndefiniteExecution flag to true, the playground keeps running, and so does the users timer.

marc0 Over a year ago

Thanks Duncan... I completely understand is now.

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