iOS - check if Timer is valid or not

user_8571142 0
Viewed 1314

In my iOS application, I need to do an action whenever there is no result coming in for 2 seconds.

So I set a timer at the beginning: 

var timer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(ViewController.noResults), userInfo: nil, repeats:false)

and whenever I get results, I destroy the timer and start a new timer object. I check if timer is valid to know if 2 seconds has been reached. When I get no results for 2 seconds, I do some action:

if result != nil {
    timer.invalidate()
    timer = Timer.scheduledTimer(timeInterval:2, target: self, selector: #selector(ViewController.noResults), userInfo: nil, repeats:false)
}

if timer.isValid {
    print("has not been 2 seconds yet")
} else {
    print("do some action")
}

This isn't working and I never get to the do some action clause. Can someone point me to the right way?

swift timer ios
1 Answers

In your code, instead of using timer.isValid, how about change to timer != nil, like following,

if result != nil {
    timer.invalidate()
//        timer = Timer.scheduledTimer(timeInterval:2, target: self, selector: #selector(ViewController.noResults), userInfo: nil, repeats:false)
}

if timer != nil { // here
    print("has not been 2 seconds yet")
} else {
    print("do some action")
}

Hope this help!

user_30896160
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