How to pause Timer() when the app goes into the background

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So I am stuck I am building a bingo app and I want the app to stop the timer when the app goes into the background. my code looks like this

var timer = Timer()

func ViewDidLoad(){
    // other stuff
    timer = Timer.scheduledTimer(timeInterval: 5, target: self, selector: #selector(numberPicker), userInfo: nil, repeats: true)
}

In other posts I've read about this I've seen people recommend defining timer as a weak variable. When I try this My app crashes when it try's to make the timer.

A modern solution is a DispatchSourceTimer which can be suspended and resumed.

The two notification observers use also modern swifty block based API, no @objc needed.

let timer = DispatchSource.makeTimerSource(queue: DispatchQueue.global())

override func viewDidLoad() {
    super.viewDidLoad()
    timer.schedule(deadline: .now() + .seconds(5), repeating: 5.0)
    timer.setEventHandler {
        print("Timer fired")
    }

    NotificationCenter.default.addObserver(forName: UIApplication.didEnterBackgroundNotification, object: nil, queue: .main) { [weak self] _ in
        self?.timer.suspend()
    }
    NotificationCenter.default.addObserver(forName: UIApplication.didBecomeActiveNotification, object: nil, queue: .main) { [weak self] _ in
        self?.timer.resume()
    }

    timer.activate()
}

Pause NSTimer when app goes to background, However, when applicationDidEnterBackground or applicationWillResignActive the timer is not paused and continues to run when the app is in the backgorund. Stopping Apps from running in background only prevents the Apps from bringing fresh updates and this may slow down the Apps. However, once you launch the Apps on your computer and start using them, the Apps will have the opportunity to refessh their data and you will be able to use them as usual.

Try this. The timer will be restarted when the application returns from the background, as well.

class ViewController: UIViewController {

    var timer = Timer()
    var timerPaused = false

    override func viewDidLoad() {
        super.viewDidLoad()
        NotificationCenter.default
            .addObserver(self,
                         selector: #selector(applicationDidEnterBackground),
                         name: UIApplication.didEnterBackgroundNotification,
                         object: nil)
        NotificationCenter.default
            .addObserver(self,
                         selector: #selector(applicationDidBecomeActive),
                         name: UIApplication.didBecomeActiveNotification,
                         object: nil)
        timer = Timer.scheduledTimer(timeInterval: 5,
                                     target: self,
                                     selector: #selector(numberPicker),
                                     userInfo: nil,
                                     repeats: true)
    }

    @objc
    func applicationDidEnterBackground(_ notification: Notification) {
        if !timerPaused {
            timer.invalidate()
            timerPaused = true
        }
    }

    @objc
    func applicationDidBecomeActive(_ notification: Notification) {
        if timerPaused {
            timer = Timer.scheduledTimer(timeInterval: 5,
                                     target: self,
                                     selector: #selector(numberPicker),
                                     userInfo: nil,
                                     repeats: true)
            timerPaused = false
        }
    }

    @objc
    func numberPicker(_ sender: Any) {

    }

}

How to run timer in background for…, How to run timer in background for unlimited time while iphone screen locked app is in foreground, the problem we face is when the app goes background How do I make the app run in the background for once in every 5 mins till the user exits the region. countdownTimer, forMode: .common) RunLoop.current. run() }. App control How to stop apps from running in the background on Windows 10 You can stop apps from running in the background to save battery, data usage, and (some) system resources, and in this

Swift 5:

override func viewDidLoad() {
        super.viewDidLoad()
        let notificationCenter = NotificationCenter.default
        notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: UIApplication.willResignActiveNotification, object: nil)
    }

    @objc func appMovedToBackground() {
        timer.invalidate()
    }

SOLVED: Running a Timer while the App is in the Background , SOLVED: Running a Timer while the App is in the Background. Forums > var timer = Timer() @Published var func stop(){ timer.invalidate() }. Background Timer is a simple timer with alarm function, which is designed to run in the background on your Windows Phone. After having set a time and started the timer, you just close the app. The alarm will still sound when the time has expired.

Counting down with a Timer, That code starts our timer at 100 and makes it count down to 0, but we need to actually display it. Now tap your app's icon to go back to the app. runs for a few seconds in the background, then pauses until the app comes back. Next, we need to add two more onReceive() modifiers below the previous� I use .onReceive as noted in my SwiftUI code below to pause my game app whenever the app goes into the background (swiping up or using the home button to change the currently active app, tapping an email notification to view the message, etc.) and it works perfectly.

ocetnik/react-native-background-timer: Emit event , Emit event periodically (even when app is in the background) and build software together. Sign up. master. 1 branch 30 tags � Go to file To use the same code both on Android and iOS use runBackgroundTimer() and stopBackgroundTimer(). stopBackgroundTimer(); //after this call all code on background stop run. Tap on the ‘start’ button and your workout will begin. The timer clearly shows the time that has passed and the remaining time so doesn’t be afraid to miss the sound signal – you can always rely on the screen. You can pause the workout at any time by pressing the ‘pause’ button.

Background timer working on Android, but not iOS � Issue #54 , When running the same app on Android and iOS, it works perfectly on setInterval() inside componentDidMount(), which works perfectly fine on work as when the app goes in background mode the iOS seems to stop the� Turn off enable summary audio advice – notifies you of assist level, battery life every time you have an app open and switch power setting on the bike. This can be very annoying if left on, be sure to turn it off! Enable auto pause – pauses in the same way as your GPS cycling computer stops. If you stop midway through

Comments
  • you would have to make timer accessible to the app delegate and call timer.pause() when the application calls applicationDidEnterBackground
  • Alternatively, add an observer for the UIApplication.didEnterBackgroundNotification notification and pause your timer in its handler.
  • A timer automatically pauses in the background so what’s the actual problem?