swift多线程定时器

swift多线程定时器的使用

func countDown(_ timeOut:Int,view: UIView){

var timeout = timeOut

let queue:DispatchQueue = DispatchQueue.global(qos: DispatchQoS.QoSClass.default)

if timer == nil {

timer = DispatchSource.makeTimerSource(flags: DispatchSource.TimerFlags(rawValue: 0), queue: queue) /*Migrator FIXME: Use DispatchSourceTimer to avoid the cast*/ as? DispatchSource

}

timer.schedule(deadline: DispatchTime.now(), repeating: DispatchTimeInterval.seconds(1), leeway: DispatchTimeInterval.seconds(0))

// timer.setTimer(start: DispatchWallTime(time: nil), interval: 1*NSEC_PER_SEC, leeway: 0)

//每秒执行

timer.setEventHandler(handler: { () -> Void in

if (timeout<=0) { //倒计时结束，关闭

self.timer.cancel()

DispatchQueue.main.async(execute: { () -> Void in

//设置界面的按钮显示 根据自己需求设置

//print("倒计时")

view.removerAlertView()

})

}else {//正在倒计时

let seconds = timeout % 60

// let strTime = NSString.localizedStringWithFormat("%.2d", seconds)

DispatchQueue.main.async(execute: { () -> Void in

//设置界面的按钮显示 根据自己需求设置

self.timerLabel.text = "\(seconds)"

})

timeout -= 1;

}

})

timer.resume()

}

暂停

var isSuspend = false

@objc func tap(_ gesture: UITapGestureRecognizer) {

if timer != nil && timer.isCancelled == false {

if isSuspend {

timer.resume()

} else {

timer.suspend()

}

isSuspend = !isSuspend

}

}

销毁

deinit {

if isSuspend {

timer?.resume() //先继续运行再销毁

}

timer?.cancel()

timer = nil

}