swift - Swift 中的运行配速计算器

Question

我是 Swift 的新手。我在 Playground 中创建了一个运行配速计算器作为实验，它运行得很好，但我很难弄清楚如何将它连接到 UI。

目前我特别困扰的事情:

• 将文本字符串转换为 Int 标签
• 进行计算的函数是否在 IBAction 中？

Playground 代码

import UIKit

func PaceCalculator (minutes:Double, seconds:Double, distance:Double) -> Double{
    return ((minutes*60) + seconds) / distance
}

var paceInSeconds = PaceCalculator(28, 26, 10.1)
var paceInMinutes = paceInSeconds / 60
var roundedMinutes = Double(floor(paceInMinutes))
var decimalSeconds = paceInMinutes - roundedMinutes
var intPace = Int(floor(roundedMinutes))
var seconds = Int(floor(decimalSeconds * 60))

println("Your average pace is \(intPace):\(seconds)/km")

Swift 代码不完整

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    @IBAction func calculatePaceButton(sender: UIButton) {

    }

    @IBOutlet weak var minutesTextField: UITextField!
    @IBOutlet weak var distanceTextField: UITextField!
    @IBOutlet weak var paceLabel: UILabel!

}

Storyboard

免责声明:我也没有编程经验。因此，请谨慎对待术语和解释。)

Answer 1

希望这对您有用:

您没有将 secondsTextField 添加为 IBOutlet，请也检查一下。

class ViewController: UIViewController {

    @IBOutlet weak var minutesTextField: UITextField!
    @IBOutlet weak var distanceTextField: UITextField!
    @IBOutlet weak var paceLabel: UILabel!
    @IBOutlet weak var secondsTextField: UITextField!
    @IBAction func calculatePaceButton(sender: UIButton) {
        var paceInSeconds = PaceCalculator((minutesTextField.text as NSString).doubleValue, seconds: (secondsTextField.text as NSString).doubleValue, distance: (distanceTextField.text as NSString).doubleValue)
        var paceInMinutes = paceInSeconds / 60.0
        var roundedMinutes = Double(floor(paceInMinutes))
        var decimalSeconds = paceInMinutes - roundedMinutes
        var intPace = Int(floor(roundedMinutes))
        var seconds = Int(floor(decimalSeconds * 60))
        paceLabel.text = "\(intPace)"
    }

    func PaceCalculator (minutes:Double, seconds:Double, distance:Double) -> Double{
        return ((minutes*60) + seconds) / distance
    }
}