mport UIKit

/// 控制定時器的類
class ZDTimerTool: NSObject {
    /// 定時器
//    private var timer: Timer?
    /// GCD定時器
    private var GCDTimer: DispatchSourceTimer?
    /// GCD定時器的掛起狀態
    private var isSuspend: Bool = false
    override init() {
        super.init()
    }
    deinit {
        // 對象在銷毀前會銷毀定時器，所以使用定時器應該設置全局的屬性
//        self.invaliTimer()
        self.invaliGCDTimer()
        DDLOG(message: "deinit: ZDTimerTool")
    }
}
/// GCD定時器相關方法
extension ZDTimerTool{
    /// 初始化得到GCD定時器
    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)
        }
        
        
        
    }
    /// 暫停或者重啟GCDTimer
    func stopOrResumeGCDTimer(isStop: Bool){
        guard self.isSuspend != isStop else {
            return
        }
        isStop == true ? self.GCDTimer?.suspend() : self.GCDTimer?.resume()
        self.isSuspend = isStop
    }
    /// 銷毀GCD定時器
    func invaliGCDTimer() {
        if self.isSuspend == true {
            self.GCDTimer?.resume()
        }
        self.GCDTimer?.cancel() //銷毀前不能為suspend(掛起狀態)
        self.GCDTimer = nil
    }
}

2.使用

swift - 添加定時器