Why Does NSTimer.scheduledTimerWithInterval() Resume When App Becomes Active?

Question

In my app I declare a timer:

entropy = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("tick"), userInfo: nil, repeats: true)

Where entropy is:

var entropy: NSTimer

Then, within ApplicationWillResignActive entropy is invalidated:

main.entropy.invalidate()

Where main is:

let main = ViewController()

But then, when the application becomes active, the timer resumes from where it last was when the app resigned active.

What am I missing here?

Regards, Brandon

Where are you initialising the timer. If the initialisation of timer is more than once, even though if you have only one instance, there will be temporary timers created which might cause the problems. — Varun, Jan 17 '16 at 17:54
If the current timer is invalidated before a new one is initialized, does that count as multiple initializations? — Brandon Bradley, Jan 17 '16 at 18:17
No but if entropy is initialised again and again before invalidating, then that'll create multiple instances. So where did you initialise the entropy? — Varun, Jan 17 '16 at 19:02
Then no, the only initialization is this: ` if (commenceButton.currentTitle == "Start") { commenceButton.enabled = false commenceButton.setTitle("Stop", forState: .Normal) entropy = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("tick"), userInfo: nil, repeats: true) commenceButton.enabled = true } else { commenceButton.enabled = false entropy.invalidate() commenceButton.setTitle("Start", forState: .Normal) commenceButton.enabled = true }` — Brandon Bradley, Jan 17 '16 at 19:05

score 0 · Answer 1 · edited May 23 '17 at 11:44

0

This was the solution:

Basically, I needed to add observers to my ViewController. For more details click the link above.

edited May 23 '17 at 11:44

Community

answered Jan 17 '16 at 22:13

Brandon Bradley

1 Answers1