swift 3.0 短信验证码倒计时实现

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class TCCountDown {private var countdownTimer: Timer?var codeBtn = UIButton()private var remainingSeconds: Int = 0 {    willSet {        codeBtn.setTitle("重新获取\(newValue)秒", for: .normal)        if newValue <= 0 {            codeBtn.setTitle("获取验证码", for: .normal)            isCounting = false        }    }}var isCounting = false {    willSet {        if newValue {            countdownTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.updateTime), userInfo: nil, repeats: true)            remainingSeconds = 60            codeBtn.setTitleColor(BtnCodeColor, for: .normal)        } else {            countdownTimer?.invalidate()            countdownTimer = nil            codeBtn.setTitleColor(MainColor, for: .normal)        }        codeBtn.isEnabled = !newValue    }}@objc private func updateTime() {    remainingSeconds -= 1}  }  //调用方法  var countDown = TCCountDown()//实例化  countDown.isCounting = true//开启倒计时

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