如何在swift中暂停并恢复NSTimer.scheduledTimerWithTimeInterval？

我正在开发一个游戏，我想创建一个暂停菜单。这是我的密码：

self.view?.paused = true

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

但是

NSTimer.scheduledTimerWithTimeInterval

仍在运行

 for var i=0; i < rocketCount; i++ {
    var a: NSTimeInterval = 1
    ii += a
    delaysShow = 2.0 + ((stimulus + interStimulus) * ii)       
    var time3 = NSTimer.scheduledTimerWithTimeInterval(delaysShow!, target: self, selector: Selector("showRocket:"), userInfo: rocketid[i], repeats: false)
 }

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

var i=0的

；我是火箭人；i++{
变量a:NSTimeInterval=1
ii+=a
延迟显示=2.0+（（刺激+间刺激）*ii）
var time3=NSTimer.scheduledTimerWithTimeInterval（delaysShow！，目标：self，选择器：选择器（“showRocket:”），用户信息：rocketid[i]，重复：false）
}

我希望

time3

在玩家单击暂停菜单时暂停计时器，并在玩家返回游戏时继续运行计时器，但是如何暂停

NSTimer.scheduledTimerWithTimeInterval

？请帮帮我。

停止

  time3.invalidate() 

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

重新开始

  time3.fire()

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

---

您需要使其无效并重新创建它。如果使用相同的按钮暂停和恢复计时器，则可以使用

isPaused

bool跟踪状态：

var isPaused = true
var timer = NSTimer()    
@IBAction func pauseResume(sender: AnyObject) {     
    if isPaused{
        timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("somAction"), userInfo: nil, repeats: true)
        isPaused = false
    } else {
        timer.invalidate()
        isPaused = true
    }
}

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

开始：

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

恢复：

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

暂停：

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer.invalidate

---

这对我有用。诀窍是不要寻找类似于

“timer.resume”

或

“timer.validate”

的东西。暂停后，只需使用“启动计时器的相同代码”将其恢复。

您无法恢复计时器。

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

与其继续，不如创建一个新的计时器

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

class SomeClass : NSObject { // class must be NSObject, if there is no "NSObject" you'll get the error at runtime

    var timer = NSTimer()

    init() {
        super.init()
        startOrResumeTimer()
    }

    func timerAction() {
        NSLog("timer action")
    }

    func pauseTimer() {
        timer.invalidate
    }

    func startOrResumeTimer() {
        timer = NSTimer.scheduledTimerWithTimeInterval(0.5, target: self, selector: Selector("timerAction"), userInfo: nil, repeats: true)
    }
}

开始 停顿 重置 “标签”是输出时的计时器。

SWIFT3

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

全球宣言：

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

 var swiftTimer = Timer()
 var count = 30
 var timer = Timer()
 @IBOutlet weak var CountDownTimer: UILabel!

viewDidLoad

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

override func viewDidLoad（）{
super.viewDidLoad（）
BtnStart.tag=0
}

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

触发的IBACTION：

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

@IBAction func BtnStartTapped(_ sender: Any) {
      if BtnStart.tag == 0 {
           BtnStart.setTitle("STOP", for: .normal)
           timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(ScoreBoardVC.update), userInfo: nil, repeats: true)

           BtnStart.tag = 1
      } else {

           BtnStart.setTitle("START", for: .normal)
           timer.invalidate()

           BtnStart.tag = 0
      }                    
 }

处理事物的函数：

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

func update(){

      if(count > 0){
           let minutes = String(count / 60)
           let ConvMin = Float(minutes)
           let minuttes1 = String(format: "%.0f", ConvMin!)

           print(minutes)
           let seconds = String(count % 60)
           let ConvSec = Float(seconds)
           let seconds1 = String(format: "%.0f", ConvSec!)

           CountDownTimer.text = (minuttes1 + ":" + seconds1)
           count += 1
      }          
 }

---

暂停计时器：计时器。无效（）

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

及

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

恢复计时器：重新创建计时器。很好

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(mainController.updateTimer), userInfo: nil, repeats: true)

---

尽管这里公开的解决方案很好，但我认为缺少了一个重要的见解。就像这里很多人解释的那样，计时器失效（）和重新创建是最好的选择。但有人可能会说，你可以这样做：

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

var paused:Bool

func timerAction() {
    if !paused {
        // Do stuff here
    }
}

更容易实现，但效率较低

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

出于能源影响的原因，苹果公司提倡尽可能避免使用计时器，并倾向于使用事件通知。如果您确实需要使用计时器，则应通过使当前计时器无效来有效地实现暂停。请阅读《苹果能效指南》中关于定时器的建议：

---

我刚刚解决了游戏中的一个类似问题，并找到了一个简单的解决方案

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

首先，我应该指出，和其他人一样，计时器和NSTimer没有暂停功能。必须使用Timer.invalidate（）停止计时器。使计时器无效后，必须再次初始化计时器才能启动计时器。引用函数.invalidate（）

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

停止计时器再次启动，并请求将其从 它的运行循环

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

要暂停计时器，我们可以使用timer.fireDate，这是timer（和NSTimer）保存计时器将来启动日期的地方

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

下面是我们如何通过保存计时器剩余的秒数来暂停计时器，直到它再次启动

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

//The variable we will store the remaining timers time in
var timeUntilFire = TimeInterval()

//The timer to pause
var gameTimer = Timer.scheduledTimer(timeInterval: delaysShow!, target: self, selector: #selector(GameClass.showRocket), userInfo: rocketid[i], repeats: false)

func pauseTimer()
{
    //Get the difference in seconds between now and the future fire date
    timeUntilFire = gameTimer.fireDate.timeIntervalSinceNow
    //Stop the timer
    gameTimer.invalidate()
}

func resumeTimer()
{
    //Start the timer again with the previously invalidated timers time left with timeUntilFire
    gameTimer = Timer.scheduledTimer(timeInterval: timeUntilFire, target: self, selector: #selector(GameClass.showRocket), userInfo: rocketid[i], repeats: false)
}

注意：在获取fireDate之前不要使计时器失效（）。调用invalidate（）后，计时器似乎会将fireDate重置为2001-01-01 00:00:00+0000

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

---

第二条注意：计时器可能会在其设定的点火日期后点火。这将导致一个负数，这将默认计时器在0.1毫秒后运行

检查这个答案@Christos Hadjikyriacou当我开火时，什么也没发生。有什么帮助吗？我想你应该重新初始化NSTimer。在Apple文档中：“（invalidate）停止接收器再次启动，并请求将其从运行循环中删除。“一旦调用invalidate，你应该将计时器设置为nil，并（重新）实例化/fire以“重启”。

。fire（）

不会再次启动计时器（从某种意义上说，它将继续重复对选择器的调用。）为了做到这一点（OP所说的“恢复”），您必须重新初始化计时器。@PanduArifSeptian如果您正在寻找适用于Swift 2的方法，这应该是可接受的答案。它适用于我。只是澄清一下，您想在“暂停”时暂停现有计时器按钮被按下…你想在按下“恢复”按钮时恢复计时器…正确吗？

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)

timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateView"), userInfo: nil, repeats: true)