RXSwift之swift几种定时器方式(3)

记录几种swift常用的定时器方式；

1、Timer

      跟OC的NSTimer一样，有两种创建方式

var timer: Timer?

 

(1)    timer = Timer.init(timeInterval: 1, target: self, selector: #selector(timerCountDown), userInfo: nil, repeats: true)

         RunLoop.current.add(timer!, forMode: .common)

(2)    timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { (timer) in

            print(timer!)

        })

// 第一种方式必须加入当前的runloop，定时器才会起作用，第二种默认加入default模式

      销毁timer  

timer?.invalidate()

timer = nil

2、DispatchSourceTimer

      一种GCD 封装的timer，不受scrollview滑动影响

var gcdTimer: DispatchSourceTimer?

 

gcdTimer = DispatchSource.makeTimerSource()

gcdTimer?.schedule(deadline: DispatchTime.now(), repeating: DispatchTimeInterval.seconds(1))

gcdTimer?.setEventHandler(handler: {

            print("hello GCD")

 })

gcdTimer?.resume()

    暂停计时器

gcdTimer?.suspend()

    继续

gcdTimer?.resume()

     停止、销毁计时器

gcdTimer?.cancel()

gcdTimer = nil

3、CADisplayLink

var cadTimer: CADisplayLink?

 

cadTimer = CADisplayLink(target: self, selector: #selector(timerFire))

cadTimer?.preferredFramesPerSecond = 1

cadTimer?.add(to: RunLoop.current, forMode: .common)

必须加入当前的runloop，定时器才会起作用

    销毁定时器

cadTimer?.invalidate()

cadTimer = nil

4、RXSwift里面的定时器

不受scrollView滑动影响

var timer: Observable!

let disposeBag = DisposeBag()

 

timer = Observable.interval(1, scheduler: MainScheduler.instance)

timer.subscribe(onNext: { (num) in

            print(num)

  }).disposed(by: disposeBag)