ios - iOS 中的简单计时器

Question

我正在尝试使用 Swift 在 iOS 中制作一个简单的计时器。该程序运行良好，但每当按下我的 START UIButton 时，计时器功能就会启动并运行多次，次数与按下按钮的次数一样多。

我想在定时器功能启动后立即禁用 START UIButton，这样它就不会运行多次。

请帮助我。

这是我的ViewController代码

import UIKit

class ViewController: UIViewController {
    var time = 0.0
    var timer = Timer()

    @IBOutlet weak var lbl: UILabel!

    @IBAction func start(_ sender: UIButton)
    {
        timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(ViewController.action), userInfo: nil, repeats: true)
    }

    @IBAction func pause(_ sender: UIButton)
    {
        timer.invalidate()
    }

    @IBAction func reset(_ sender: UIButton)
    {
        timer.invalidate()
        time = 0.0
        lbl.text = ("0")
    }

    func action()
    {
        time += 0.1
        lbl.text = String(time)
    }

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

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

Answer 1

要禁用您的按钮，您只需在 start 函数中设置它的 isUserInteractionEnabled 属性:

@IBOutlet weak var startButton: UIButton!

@IBAction func start(_ sender: UIButton) {
    timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(ViewController.action), userInfo: nil, repeats: true)
    startButton.isEnabled = false
}

然后在pause和reset方法中将其设置回true:

@IBAction func pause(_ sender: UIButton) {
    timer.invalidate()
    startButton.isEnabled = true
}

@IBAction func reset(_ sender: UIButton) {
    timer.invalidate()
    startButton.isEnabled = true 
    //the rest of your code
}