How to add countdowntimer which will run in whole iOS application?

Question

I need to add a global timer of 60 minutes in the application which will show in all ViewControllers. But not able to implement this feature.

I have implemented timer in one ViewController till now. Here is my code:

 var timerCount = 3600
var timer = Timer()
 timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(update), userInfo: nil, repeats: true)

func update() {

    if(timerCount > 0){
        let minutes = String(timerCount / 60)
        let seconds = String(timerCount % 60)
        timeLbl.text = minutes + ":" + seconds
        timerCount -= 1
    }
    else {
        timer.invalidate()
        let vc = storyboard?.instantiateViewController(withIdentifier: "NavigateViewController")
        navigationController?.pushViewController(vc!, animated: true)

    }

}

I need to show this timer value in every ViewController of the application.

What do you mean by "not able to implement this feature"? Please be more specific. What is not working? Do you receive an error? — Dávid Pásztor, Aug 20 '17 at 11:42
Means I have created timer and its working. But how to make it global,and show the result in all viewcontroller — vickydutta, Aug 20 '17 at 11:46
Make a protocol and implement delegate functions in the viewcontrollers. — matiastofteby, Aug 20 '17 at 11:47
Why you need this process in all view you can use NSnotifications when timer invalidated — Abdelahad Darwish, Aug 20 '17 at 11:48
Its in project scope to show timer on top of every screen....... — vickydutta, Aug 20 '17 at 11:50
If you use pods then you can create static timer with AsyncTimer — Adrian Bobrowski, Aug 20 '17 at 13:02

score 2 · Accepted Answer · answered Aug 20 '17 at 12:09

2

// Create  class TimerManager

class TimerManager {
    var timerCount = 3600

       static let sharedInstance = TimerManager()
    var timer: Timer?

    init() {

        self.timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(update), userInfo: nil, repeats: true)


    }

    @objc func update() {
        if(timerCount > 0){
            let minutes = String(timerCount / 60)
            let seconds = String(timerCount % 60)
            timerCount -= 1
        }
        else {
            self.timer?.invalidate()


        }
    }


}


// At view Controller   you can access  timerCount

  print(TimerManager.sharedInstance.timerCount)

answered Aug 20 '17 at 12:09

Abdelahad Darwish

5,969
1
17
35

Will this be a NSObject class? And how to call method to start timer ? – vickydutta Aug 20 '17 at 12:21
Just timer will start after you sharedInstance – Abdelahad Darwish Aug 20 '17 at 12:45
It shows only Single value .E.g I if call print method in Viewcontroller A ==> ViewDidLoad , then it is not updating – vickydutta Aug 20 '17 at 13:02

score 0 · Answer 2 · answered Aug 20 '17 at 11:50

0

You should display it in a separate UIWindow instance. Put the label in a separate View Controller and refer to answer 42 from this post: To create a new UIWindow over the main window

answered Aug 20 '17 at 11:50

Arik Segal

2,963
2
17
29

score 0 · Answer 3 · edited Aug 20 '17 at 13:07

0

// Create  class TimerManager

class TimerManager {
    var timerCount = 3600

       static let sharedInstance = TimerManager()
    var timer: Timer!

    init() {

        self.timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(update), userInfo: nil, repeats: true)


    }

    @objc func update() {
        if(timerCount > 0){
            let minutes = String(timerCount / 60)
            let seconds = String(timerCount % 60)
            timerCount -= 1
        }
        else {
            self.timer?.invalidate()


        }
    }


}


// At view Controller   you can access  timerCount

  print(TimerManager.sharedInstance.timerCount)

edited Aug 20 '17 at 13:07

Suraj Rao

29,388
11
94
103

answered Aug 20 '17 at 12:21

Taniah1234

1

Will this be a NSObject class? And how to call method to start timer ? – vickydutta Aug 20 '17 at 12:23
Welcome to SO!. You might want to explain how your code solves the problem for OP. I suggest you edit your post and improve it. – Suraj Rao Aug 20 '17 at 13:09
you've missed the most important part: how to update the VC's with the current time. @vickydutta, you can have the `update` method send a notification and have all the VC register for it. when a VC gets a notification from the timer it is updating the timeLbl. – gutte Aug 20 '17 at 14:06

How to add countdowntimer which will run in whole iOS application?

3 Answers3