Question

我需要多个不同时期的倒数计时器。如何在相同的活动和相同的标签中停止一个并启动另一个。

我现在有这个代码：

import UIKit

类ViewController：UIViewController {

@IBOutlet weak var countDownLabel: UILabel!

    var count = Int()
    var timer = Timer()
    var timerIndex = Int()

override func viewDidLoad() {
    super.viewDidLoad()


     timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: Selector("update"), userInfo: nil, repeats: true)
}

var timerHasFinishedRunning: Bool = false
func update() {

    let minutes = String(count / 60)
    let seconds = String(count % 60)

    if count == 0 {


        if timerIndex == 0 { count = 12
        }
        else if timerIndex == 1 {
            count = 11
        }
        else if timerIndex == 2 {
            count = 10
        }
        else if timerIndex == 3 {
            count = 9
        }
        else {
            timer.invalidate()
            countDownLabel.text = "The timer has finished running!"
            timerHasFinishedRunning = true

        }
        if timerHasFinishedRunning == false{
            let minutes = String(count / 60)
            let seconds = String(count % 60)

            countDownLabel.text = minutes + ":" + seconds

            timer.invalidate()
            timerIndex += 1
            timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(ViewController.update), userInfo: nil, repeats: true)
        }

    }
    else {
        if timerIndex == 0{
            count -= 1
            let minutes = String(count / 60)
            let seconds = String(count % 60)
            countDownLabel.text = minutes + ":" + seconds
        }
        else if timerIndex == 1{
            count -= 1
            let minutes = String(count / 60)
            let seconds = String(count % 60)
            countDownLabel.text = minutes + ":" + seconds
        }
        else if timerIndex == 2{
            count -= 1
            let minutes = String(count / 60)
            let seconds = String(count % 60)
            countDownLabel.text = minutes + ":" + seconds
        }
        else if timerIndex == 3{
            count -= 1
            let minutes = String(count / 60)
            let seconds = String(count % 60)
            countDownLabel.text = minutes + ":" + seconds
        }

    }

}



override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

Answer 1

初步答复：

如果您希望格式为M：S：

，请将update()功能替换为此功能

var timerHasFinishedRunning: Bool = false


func update() {

        if count == 0{

            if timerIndex == 0{ count = 200 // or the desired value for the second timer


            }
            else if timerIndex == 1{
                count = 40 // or the desired value for the third timer
            }
            else {
            timer.invalidate()
            countDownLabel.text = "The timer has finished running!"
            timerHasFinishedRunning = true

            }
            if timerHasFinishedRunning == false{
            let minutes = String(count / 60)
            let seconds = String(count % 60)
            countDownLabel.text = minutes + ":" + seconds

            timer.invalidate()
            timerIndex += 1
            timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(ViewController.update), userInfo: nil, repeats: true)
          }  

        }
        else {
            if timerIndex == 0{
                count -= 1
                let minutes = String(count / 60)
                let seconds = String(count % 60)
                countDownLabel.text = minutes + ":" + seconds
            }
            else if timerIndex == 1{
                count -= 1
                let minutes = String(count / 60)
                let seconds = String(count % 60)
                countDownLabel.text = minutes + ":" + seconds
            }
            else if timerIndex == 2{
                count -= 1
                let minutes = String(count / 60)
                let seconds = String(count % 60)
                countDownLabel.text = minutes + ":" + seconds
            }
        }
    }

编辑：

将代码替换为此代码，然后添加新值！格式：MM：SS：

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var countDownLabel: UILabel!

    var count = Int()
    var timer = Timer()
    var timerIndex = 0
    var timerHasFinishedRunning: Bool = false

    override func viewDidLoad() {
        super.viewDidLoad()

        count = 5

        timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(ViewController.update), userInfo: nil, repeats: true)
    }

    func update() {
        if count == 0{

            if timerIndex == 0{ count = 3 // or the desired value for the second timer


            }
            else if timerIndex == 1{
                count = 2 // or the desired value for the third timer
            }
            else {

                timer.invalidate()
                countDownLabel.text = "The timer has finished running!"
                timerHasFinishedRunning = true

            }
            if timerHasFinishedRunning == false{
                let minutes = Int(count / 60)
                let seconds = Int(count % 60)
                if minutes > 9{
                    if  seconds >= 10{
                        countDownLabel.text = "\(minutes)" + ":" + "\(seconds)"
                    }
                    else if seconds < 10{
                        countDownLabel.text = "\(minutes)" + ":" + "0\(seconds)"
                    }
                }
                else if minutes<=9{
                    if  seconds >= 10{
                        countDownLabel.text = "0\(minutes)" + ":" + "\(seconds)"
                    }
                    else if seconds < 10{
                        countDownLabel.text = "0\(minutes)" + ":" + "0\(seconds)"
                    }
                }

            timer.invalidate()
            timerIndex += 1
            timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(ViewController.update), userInfo: nil, repeats: true)
            }

        }
        else {

                count -= 1
                let minutes = Int(count / 60)
                let seconds = Int(count % 60)
                if minutes > 9{
                    if  seconds >= 10{
                    countDownLabel.text = "\(minutes)" + ":" + "\(seconds)"
                    }
                    else if seconds < 10{
                        countDownLabel.text = "\(minutes)" + ":" + "0\(seconds)"
                    }
                }
                else if minutes<=9{
                    if  seconds >= 10{
                        countDownLabel.text = "0\(minutes)" + ":" + "\(seconds)"
                    }
                    else if seconds < 10{
                        countDownLabel.text = "0\(minutes)" + ":" + "0\(seconds)"
                    }
            }
        }


    }
}

如果我想找到解决问题的方法，我会再次更新答案。 希望这有帮助！

SIMULATOR：

Answer 2

试试这个......只是根据你的要求改变

 var count = Int()
 var timer = NSTimer()

 override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a 

  printSecondsToHoursMinutesSeconds(100)

  timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: #selector(ViewController.update), userInfo: nil, repeats: true)


}
 func update() {
count = 1 + count
if(count != 0) {
  printSecondsToHoursMinutesSeconds(count)

} else {
  timer.invalidate()
}

}

func printSecondsToHoursMinutesSeconds (seconds:Int) -> () {
 let (h, m, s) = secondsToHoursMinutesSeconds (Double(seconds))
print ("\(h) Hours, \(m) Minutes, \(s) Seconds")

}

func secondsToHoursMinutesSeconds (seconds : Double) -> (Double, Double, Double) {
let (hr,  minf) = modf (seconds / 3600)
let (min, secf) = modf (60 * minf)
return (hr, min, 60 * secf)

}

xcode中倒数计时器的继承

2 个答案:

初步答复：

编辑：

SIMULATOR：