如何使用倒数计时器停止游戏 - iOS [SWIFT] -

Posted 2023-03-12

【中文标题】如何使用倒数计时器停止游戏 - iOS [SWIFT] -

【英文标题】：How to use a countdown timer to stop a game - iOS [SWIFT] -

【发布时间】：2014-09-20 14:58:45

【问题描述】：

我的游戏应该在 60 秒后停止。但是我的计时器代码没有任何反应。

var timer = NSTimer()
var counter:Int = 60
var labelCounter:SKLabelNode = SKLabelNode()

这是我的 GameScene 类中的代码：

func startTimer()

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


func updateTimer(dt:NSTimer)

    counter--

    if counter == 0 
        timer.invalidate()
        removeCountDownTimerView()
     else
        labelCounter.text = "\(counter)"
    


func removeCountDownTimerView()

    scene.view.paused = true

感谢您的洞察力:-)

【问题讨论】：

您是否尝试过暂停场景而不是视图：scene.paused = true

【参考方案1】：

试试这样的......

override func viewDidLoad() 
    super.viewDidLoad()
    //calling the wait function 
    self.callForWait()


func callForWait()
    //setting the delay time 60secs.
    let delay = 60 * Double(NSEC_PER_SEC)
    let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
    dispatch_after(time, dispatch_get_main_queue())  
        //call the method which have the steps after delay.
        self.stepsAfterDelay()
    



func stepsAfterDelay()
   //your code after delay takes place here...

【参考方案2】：

我在游戏中遇到过这个。希望对您有所帮助：

import UIKit

class ViewController: UIViewController 

    override func viewDidLoad() 
        super.viewDidLoad()

        startGame()
    

    var startTime = NSTimeInterval()
    var timer = NSTimer()
    var gameTime:Double = 10


    func startGame() 

        let aSelector : Selector = "updateTime"
        timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: aSelector, userInfo: nil, repeats: true)
        startTime = NSDate.timeIntervalSinceReferenceDate()

    

    func updateTime() 
        var currentTime = NSDate.timeIntervalSinceReferenceDate()
        var elapsedTime = currentTime - startTime
        var seconds = gameTime-elapsedTime
        if seconds > 0 
            elapsedTime -= NSTimeInterval(seconds)
            println("\(Int(seconds))")
         else 
            timer.invalidate()
        
    

【讨论】：

漂亮！史蒂夫只有一件事，有任何目的 elapsedTime -= NSTimeInterval(seconds) 吗？