我如何建立一个重复的倒数计时器？ [关闭]

Question

关闭。这个问题需要更多focused。它当前不接受答案。

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是否要改善此问题？更新问题，使其仅按editing this post专注于一个问题。

[<6天前关闭。

im试图构建具有2个倒数计时器。一暂停倒计时（15秒）和一设置倒计时（45秒）。当设置倒数计时到零时，我希望它重置为15秒（暂停倒计时）并自动将其倒计时。当“暂停持续时间”达到零时，我希望将其重置为45秒（设置倒计时）。我要么让它完全停止运行，要么工作一圈，然后再计算-1，-2，-3，-4

这是我到目前为止尝试过的

@ IBOutlet弱var goOrPauseLabel：UILabel！

@IBOutlet weak var countDownLabel: UILabel!


@IBAction func startButton(_ sender: Any) {
    timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(countDownMethod), userInfo: nil, repeats: true)
}

@objc func countDownMethod() {
    countDownLabel.text = "\(setCountdown)"
    setCountdown -= 1

    if setCountdown <= 0 {
        countDownLabel.text = "\(pauseCountdown)"
        pauseCountdown -= 1
    }
    else if pauseCountdown <= 0 {
        countDownLabel.text = "\(setCountdown)"
        setCountdown -= 1
    }
}

希望您能理解我的问题我感谢您的回答

Answer 1

我已经做了类似的工作。尝试将此代码粘贴到操场上，然后四处游玩以获得所需的结果。

import UIKit
import PlaygroundSupport

class CountdownTimer {

    var timer: Timer?

    init(_ time: Int, completion: @escaping (Int) -> Void) {
        var timePeriod = time
        timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { _ in
            timePeriod -= 1
            completion(timePeriod)
            if timePeriod == 0 {
                self.timer?.invalidate()
            }
        }
    }
}

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let label       = UILabel()
        label.text      = "5"
        label.textColor = .white
        label.translatesAutoresizingMaskIntoConstraints = false

        view.addSubview(label)
        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: view.centerYAnchor)])

        CountdownTimer(5) { time in
            label.text = "\(time)"
        }
    }
}

PlaygroundPage.current.liveView                 = ViewController()
PlaygroundPage.current.needsIndefiniteExecution = true