将倒数计时器值重置为数组中保存的默认值

Question

我正在从数组中的默认 Int 值创建倒数计时器，但我无法弄清楚如何将计时器重置为数组中的原始值。 这意味着当用户按下“停止酿造”时，倒数计时器将从例如 5 分钟重新开始。 有人可以帮我找出我做错了什么或遗漏了什么吗？ 我正在迈出 iOS 开发的第一步。

提前致谢！

我的代码：

@objc func runTimer() {

    cafe.time -= 1
    labelCowntdownTimer.text = "\(cafe.time)"
    // MM:SS:_

    let flooredCounter = cafe.time

    let minute = (flooredCounter % 3600) / 60
    var minuteString = "\(minute)"
    if minute < 10 {
        minuteString = "0\(minute)"
    }

    let second = (flooredCounter % 3600) % 60
    var secondString  = "\(second)"
    if second < 10 {
        secondString = "0\(second)"
    }

    labelCowntdownTimer.text = "\(minuteString):\(secondString)"

}

//Mark: - resetTimer

@objc func resetTimer() {

    timer.invalidate()
    //cafe.time
    runTimer()

}


//Mark: - ButtonPressed - Start Timer

@IBAction func startButtonPressed(_ sender: Any) {

    if !isTimerRunning {

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

        isTimerRunning = true
        startButton.setTitle("Stop Brewing", for: .normal)
    } else {
        resetTimer()
        isTimerRunning = false
        startButton.setTitle("Start Brewing", for: .normal)

    }
}

Answer 1

在您的viewDidload()或每当您获得存储在数组中的值时，将该值存储在一个变量中。

var initialValueOfTime = 0   // the initial value is stored here. which is 300

override func viewDidLoad() {
    super.viewDidLoad()
    initialValueOfTime = cafe.time
}
@objc func runTimer() {

    if isTimerRunning {
        cafe.time -= 1
    } else {
        cafe.time = initialValueOfTime
    }
    labelCowntdownTimer.text = "\(cafe.time)"
    // MM:SS:_

    let flooredCounter = cafe.time

    let minute = (flooredCounter % 3600) / 60
    var minuteString = "\(minute)"
    if minute < 10 {
        minuteString = "0\(minute)"
    }

    let second = (flooredCounter % 3600) % 60
    var secondString  = "\(second)"
    if second < 10 {
        secondString = "0\(second)"
    }

    labelCowntdownTimer.text = "\(minuteString):\(secondString)"

}

//Mark: - resetTimer

@objc func resetTimer() {

    timer.invalidate()
    runTimer()
}


//Mark: - ButtonPressed - Start Timer

@IBAction func startButtonPressed(_ sender: Any) {

    if !isTimerRunning {
        isTimerRunning = true
        timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(runTimer), userInfo: nil, repeats: true)
        startButton.setTitle("Stop Brewing", for: .normal)
    } else {
        isTimerRunning = false
        resetTimer()
        startButton.setTitle("Star Brewing", for: .normal)

    }
}

Answer 2

试试下面的代码

@objc func resetTimer() {

    timer.invalidate()
    timer = nil //You should also need to nil to a timer to stop it.

    //runTimer() - also comment this line as its not needed to call this function after stop timer.

    //Reinitialize all your required variable here to calculate the time
}