ios - Swift 计时器标签重复出现 9

Question

我在 swift 3 中创建了一个简单的计时器。

尽管出于某种原因，即使标签显示了太多数字，但它仍然显示了太多的数字 :S 它显示了大量的 9。这与四舍五入有关吗？

谢谢，下面的代码:)

---

var swiftTimer : Timer?
var swiftCounter: Double = 0.00

@IBOutlet weak var displayTimeLBL: UILabel!

@IBAction func start(_ sender: Any) {
    swiftTimer = Timer.scheduledTimer(timeInterval: 0.01, target: self, selector: #selector(ViewController.updateCounter), userInfo: nil, repeats: true)

    }

@IBAction func stop(_ sender: Any) {
    if swiftTimer != nil{
        swiftTimer?.invalidate()
        swiftCounter = 0.00
        updateLabel()
        swiftTimer = nil
    }
}

func updateLabel(){
    displayTimeLBL.text = String(swiftCounter)
}
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

func updateCounter(){
    swiftCounter+=0.01
    round(swiftCounter)
    updateLabel()
}

enter image description here

Answer 1

最简单的解决方案:

func updateCounter(){
        swiftCounter+=0.01
        round(swiftCounter)
        swiftCounter = Double(round(100*swiftCounter)/100)
        updateLabel()
    }