ios8 - How can I pause and resume NSTimer.scheduledTimerWithTimeInterval in swift?

Question

I'm developing a game and I want to create a pause menu. Here is my code:

self.view?.paused = true

but NSTimer.scheduledTimerWithTimeInterval still running...

 for var i=0; i < rocketCount; i++ {
    var a: NSTimeInterval = 1
    ii += a
    delaysShow = 2.0 + ((stimulus + interStimulus) * ii)       
    var time3 = NSTimer.scheduledTimerWithTimeInterval(delaysShow!, target: self, selector: Selector("showRocket:"), userInfo: rocketid[i], repeats: false)
 }

I want time3 to pause the timer when player click pause menu and continue run the timer when player come back to the game, but how can I pause NSTimer.scheduledTimerWithTimeInterval? help me please.

Answer 1

You need to invalidate it and recreate it. You can then use an isPaused bool to keep track of the state if you have the same button to pause and resume the timer:

var isPaused = true
var timer = NSTimer()    
@IBAction func pauseResume(sender: AnyObject) {     
    if isPaused{
        timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("somAction"), userInfo: nil, repeats: true)
        isPaused = false
    } else {
        timer.invalidate()
        isPaused = true
    }
}