mport UIKit/// 控制定时器的类
class ZDTimerTool: NSObject {/// 定时器
//    private var timer: Timer?/// GCD定时器private var GCDTimer: DispatchSourceTimer?/// GCD定时器的挂起状态private var isSuspend: Bool = falseoverride init() {super.init()}deinit {// 对象在销毁前会销毁定时器，所以使用定时器应该设置全局的属性
//        self.invaliTimer()self.invaliGCDTimer()DDLOG(message: "deinit: ZDTimerTool")}
}
/// GCD定时器相关方法
extension ZDTimerTool{/// 初始化得到GCD定时器func DispatchTimer(timeInterval: TimeInterval , handleBlock:@escaping (() -> Void)) {if self.GCDTimer == nil {self.GCDTimer = DispatchSource.makeTimerSource(flags: [], queue: DispatchQueue.main)self.GCDTimer?.schedule(deadline: DispatchTime.now(), repeating: timeInterval)self.GCDTimer?.setEventHandler{DispatchQueue.main.async {handleBlock()}}self.GCDTimer?.resume()self.GCDTimer?.schedule(deadline: DispatchTime.now(), repeating: timeInterval)}else{self.stopOrResumeGCDTimer(isStop: false)}}/// 暂停或者重启GCDTimerfunc stopOrResumeGCDTimer(isStop: Bool){guard self.isSuspend != isStop else {return}isStop == true ? self.GCDTimer?.suspend() : self.GCDTimer?.resume()self.isSuspend = isStop}/// 销毁GCD定时器func invaliGCDTimer() {if self.isSuspend == true {self.GCDTimer?.resume()}self.GCDTimer?.cancel() //销毁前不能为suspend(挂起状态)self.GCDTimer = nil}
}

    //倒计时var countdownTimer = ZDTimerTool()

适当地方开启定时器       countdownTimer.DispatchTimer(timeInterval: 1) { [weak self] inself?.handTimer()}

    func handTimer() {if self.remainingSeconds == 0{self.remainingSeconds = 60self.sendButton.setTitle("重新发送", for: .normal)self.sendButton.backgroundColor = UIColor.init(hexColor: "FF8E00")self.sendButton.isEnabled = trueself.countdownTimer.stopOrResumeGCDTimer(isStop: true)}else{sendButton.setTitle("\(remainingSeconds)秒后重新获取", for: .normal)self.sendButton.backgroundColor = UIColor.graysendButton.isEnabled = false}self.remainingSeconds -= 1}