話不多說(shuō)，直接上代碼硬鞍！~

定時(shí)器

import UIKit

class XT_ZJTimer: NSObject {
    private(set) var _timer: Timer!
    fileprivate weak var _aTarget: AnyObject!
    fileprivate var _aSelector: Selector!
    var fireDate: Date {
        get{
            return _timer.fireDate
        }
        set{
            _timer.fireDate = newValue
        }
    }
    
    class func scheduledTimer(timeInterval ti: TimeInterval, target aTarget: AnyObject, selector aSelector: Selector, userInfo: Any?, repeats yesOrNo: Bool) -> XT_ZJTimer {
        let timer = XT_ZJTimer()
        
        timer._aTarget = aTarget
        timer._aSelector = aSelector
        timer._timer = Timer.scheduledTimer(timeInterval: ti, target: timer, selector: #selector(XT_ZJTimer.zj_timerRun), userInfo: userInfo, repeats: yesOrNo)
        return timer
    }
    
    func fire() {
        _timer.fire()
    }
    
    func invalidate() {
        _timer.invalidate()
    }
    
    @objc func zj_timerRun() {
        //如果崩在這里慧瘤，說(shuō)明你沒(méi)有在使用Timer的VC里面的deinit方法里調(diào)用invalidate()方法
        _ = _aTarget.perform(_aSelector)
    }
    
    deinit {
        print("計(jì)時(shí)器已銷毀")
    }
}

需要調(diào)用的類封裝

import UIKit

class XT_IntimateLoversTimer {
    /// 活動(dòng)結(jié)束秒數(shù)
    var secondsToEnd: Int = 0
    var myTimer: XT_ZJTimer!
    var callBack: ((String)->())?
    var isMin:Bool = false
    
    init(seconds: Int, isMin:Bool, callBack: ((String)->())?) {
        self.isMin = isMin
        self.secondsToEnd = seconds
        myTimer = XT_ZJTimer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(timerRun), userInfo: nil, repeats: true)
        //如果希望對(duì)Timer做自定義的操作，使用_Timer屬性
        RunLoop.current.add(myTimer._timer, forMode: RunLoop.Mode.common)
        myTimer.fire()
        self.callBack = callBack
    }
    
    deinit {
        myTimer.invalidate()
    }
    
    @objc func timerRun() {
        secondsToEnd -= 1
        if secondsToEnd == 0 {
            myTimer.invalidate()
        }
        if isMin == true {
            callBack?(minToTimeString(seconds: secondsToEnd))
        } else {
            callBack?(Func_HGT_secondsToTimeString(seconds: secondsToEnd))
        }
    }
    /// 秒數(shù)轉(zhuǎn)化為時(shí)間字符串
    func Func_HGT_secondsToTimeString(seconds: Int) -> String {
        //小時(shí)計(jì)算
        let hours = seconds/3600
        
        //分鐘計(jì)算
        let minutes = (seconds)%3600/60;
        
        //秒計(jì)算
        let second = (seconds)%60;
        
        let timeString  = String(format: "%02lu:%02lu:%02lu", hours, minutes, second)
        return timeString
    }
    
    /// 秒數(shù)轉(zhuǎn)化為時(shí)間字符串
    func minToTimeString(seconds: Int) -> String {
        //分鐘計(jì)算
        let minutes = seconds/60;

        //秒計(jì)算
        let second = (seconds)%60;

        let timeString  = String(format: "%02lu:%02lu", minutes, second)
        return timeString
    }
}

使用

import UIKit

import UIKit

class DemoView: UIView {
    var loveTimer:XT_IntimateLoversTimer!

    override func viewDidLoad() {
        //seconds根據(jù)實(shí)際計(jì)算（活動(dòng)結(jié)束時(shí)間減去當(dāng)前時(shí)間得出的秒數(shù)）
        if let applyEndTime = userModel?.apply?.applyEndTime {
                // 當(dāng)前時(shí)間
                let timeInterval: TimeInterval = Date().timeIntervalSince1970
                let timeStamp = Int(timeInterval)
                let loveTime = (applyEndTime) / 1000 - timeStamp
                
                loveTimer = XT_IntimateLoversTimer(seconds: loveTime, isMin: false, callBack: {[weak self] (text) in
                    let contentStr = String("\(text)  后結(jié)束")
                    self?.timeLabel.text = contentStr
                })
            }
    }
}