CODEWITHSUNDEEP
iosmultithreadingswifttimer
the_one
the_one

Reputation: 271

Swift , Apllication running on background on the emulator but not on the device

I did this code in swift (2.0)

var timer: dispatch_source_t!
var a = 0
func startTimer() {
    let queue = dispatch_queue_create("com.domain.app.timer", nil)
    timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue)
    dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, 1 * NSEC_PER_SEC, 1 * NSEC_PER_SEC) // every 60 seconds, with leeway of 1 second
    dispatch_source_set_event_handler(timer) {
        self.a = self.a+1
       print( self.a)
    }
    dispatch_resume(timer)
}

func stopTimer() {
    dispatch_source_cancel(timer)
    timer = nil
}

the problem is that this code work well on the emulator , I see in the consol a number incrementing every second, and when I go the the home page of the emulator the number is still incrementing , On the device, the number stop incrementing as soon as we quit the application context . so how can I make it keep incrementinf on the device ?

Upvotes: 0

Views: 512

Answers (1)

Kirsteins
Kirsteins

Reputation: 27345

By default iOS applications do not support background execution. You can start execute finite-length background tasks with beginBackgroundTaskWithName method or you have to enable special background modes like voip, location, remote notifications to run in background. (The use of those modes are reviewed by Apple when you submit app to Appstore)

More info: Background execution documentation

I agree that it is quite misleading that it works on simulator, when it is not supposed to.

Upvotes: 1

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