Swift 4 Grand Central Dispatch Repeating Timer.
Ment for repeating tasks without the overhead of Timer.
Based on this StackOverFlow question and Rob answer.
- Add JBTimer.swift to your project (drag and drop)
- From your ViewController(or wherever you might want to use it):
let myTimer = JBTimer()
- Then you can start it like this:
//Where 500 is milliseconds, for closure auto-creation hit enter when suggestion is over it,
//you have to handle weak or unowned self.
myTimer.repeateTimer(timeInMilliSecs: 500) { [weak self] () -> Void in
//Do your stuff inside this closure
//I recommend using NSLog when testing time sensitive stuff, since it prints date to the logs.
NSLog("Working \(self!.description)")
}
- Later on you can modify the object:
myTimer.repeateTimer(timeInMilliSecs: 1000) { () -> Void in
//Do your stuff inside this closure
print("This starts to feel good, every 10 seconds")
}
- When bored of it, just call:
myTimer.stopTimer()
#Attention:
If you use it on a non global scope(local variable), for example inside an if statement, it will only work
while in that scope, for example if you want the timer to live while in a ViewController declare the object
at a class scope variable.
This timer was ment for cpu cycles efficiency, so IT IS NOT TIME CRITICAL, dont use it on things you need time critic response, also it has a leeway of 1 second to improve energy use. It gets more exact when the cpu is less busy, you can do tests using NSLog and comparing timestamps of fired events.
#Suggestion:
If using in a ViewController you might want to .stopTimer() when viewWillDisappear and/or in viewWillUnload.
Also you might want to re-start or re-create the timer in your viewWillAppear and/or viewDidAppear.
#Known Bug The first time you run the timer it fires the block instantly, not sure why yet, any help is appreciated.