NStimer

NSTimer+closure.swift

extension NSTimer {
    class func scheduledTimerWithTimeInterval(interval: NSTimeInterval, repeats: Bool, handler: NSTimer! -> Void) -> NSTimer {
        let fireDate = interval + CFAbsoluteTimeGetCurrent()
        let repeatInterval = repeats ? interval : 0
        let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, repeatInterval, 0, 0, handler)
        CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, kCFRunLoopCommonModes)
        return timer
    }
}
 
// Usage:
var count = 0
NSTimer.scheduledTimerWithTimeInterval(1, repeats: true) { timer in
    println(++count)
    if count >= 10 {
        timer.invalidate()
    }
}