Swift 自己写定时器

概述    private var timer: dispatch_source_t? = nil     private func startTimer() {         let updateInterval: UInt64 = 1         let interval = updateInterval * NSEC_PER_SEC         let leeway: UInt64 =

private var timer: dispatch_source_t? = nil

private func startTimer() {

let updateInterval: UInt64 = 1

let interval = updateInterval * NSEC_PER_SEC

let leeway: UInt64 = 300000000 // UInt64(0.3) * interval

let queue = dispatch_get_global_queue(disPATCH_QUEUE_PRIORITY_DEFAulT,0)

timer = dispatch_source_create(disPATCH_SOURCE_TYPE_TIMER,0,queue)

if timer != nil {

dispatch_source_set_timer(timer!,dispatch_walltime(nil,0),interval,leeway)

dispatch_source_set_event_handler(timer!,{ () -> VoID in

self.checkNewScreenshot()

})

}

dispatch_resume(timer!)

}

private func stopTimer() {

if timer != nil {

dispatch_suspend(timer!)

dispatch_resume(timer!)

timer = nil

}

}

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