秒表在后台运行-Swift

Question

我在iOS课程中创建了一个简单的秒表应用。完成后，我意识到它没有做任何重要的事情，它没有在后台运行。

这怎么办？我在这个主题上进行了很多搜索，但是找不到正确的答案。

任何想法都值得赞赏。下面的代码是目前集成在应用程序中的代码。

var timer: Timer!
var minutes = 0
var seconds = 0
var fractions = 0
var lapArray: [String]? = []// to track the laps
var addLap = false
var counterString = ""
var isStarted = false


//MARK: - Methods
override func viewDidLoad() {
    super.viewDidLoad()
    makeStatusBarWhite()
    configureInterface()

    timeLabel.text  = "00:00.00"


}


func configureInterface() {
    startButton.layer.cornerRadius = startButton.frame.size.height/2
    lapButton.layer.cornerRadius = startButton.frame.size.height/2
}


@objc func timeDidIncrease() {

    fractions += 1
    if fractions == 100 {
        seconds += 1
        fractions = 0
    }
    if seconds == 60 {
        minutes += 1
        seconds = 0
    }

    let fractionsString = fractions > 9 ? "\(fractions)" : "0\(fractions)"
    let secondsString = seconds > 9 ? "\(seconds)" : "0\(seconds)"
    let minutesString = minutes > 9 ? "\(minutes)" : "0\(minutes)"


    counterString = "\(minutesString):\(secondsString).\(fractionsString)"
    timeLabel.text = counterString

}


func configureAndStartTimer() {
    timer = Timer.scheduledTimer(timeInterval: 0.01, target: self, selector: #selector(timeDidIncrease) , userInfo: nil, repeats: true)

    RunLoop.current.add(timer, forMode: RunLoop.Mode.common) //timer will not be affected by UI interaction
}


//MARK: - Actions
@IBAction func didTapLap(_ sender: Any) {

    if isStarted {
        lapArray?.insert(timeLabel.text!, at:0)


    }else {
        timeLabel.text = "00:00.00"
        fractions = 0
        minutes = 0
        seconds = 0
        timer.invalidate()
        lapArray?.removeAll()
        resetStartButton()
        lapButton.setTitle("Lap", for: .normal)
        lapButton.isUserInteractionEnabled = false
        lapButton.alpha = 0.3

    }
    lapsTableView.reloadData()
}