Overview
When you want to run something every x amount of time, you use an NSTimer. It is like the setInterval or setTimeout function from Javascript. You can find more information on NSTimers here.
Content
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
/*
class func scheduledTimerWithInterval(
_ seconds: NSTimeInterval,
target: AnyObject,
selector: Selector(String),
userInfo: AnyObject?,
repeats: Bool
)
*/
let timer = NSTimer.scheduledTimerWithInterval(
2.0,
target: self,
selector: "fire:", // the : means "call with an argument"
userInfo: nil,
repeats: true
)
func fire(timer: NSTimer) {
if imDoneWithThisTimer {
timer.invalidate()
}
}
Every 2 seconds, the method fire(NSTimer) will be invoked in self