在 Swift 中运行配速计算器

Question

我是 Swift 的新手。我在 Playground 中创建了一个跑步速度计算器作为实验，它运行良好，但我很难弄清楚如何将它连接到 UI。

我目前特别纠结的事情：

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

游乐场代码

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")

不完整的 Swift 代码

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!

}

故事板

免责声明：我也没有编程经验。所以对行话和解释要温柔。）

Answer 1

希望这对你有用：

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
    }
}

Answer 2

在这里我想分享我的计算速度的解决方案。计算基于时间和位置的输入，更通用和有用。

typealias ShortFullTupleStrings = (short: String, full: String)
class PaceCalculator {
    private static func relatedTimeString(
      for value: TimeInterval)
      -> ShortFullTupleStrings?
    {
      let fm = DateComponentsFormatter()
      switch abs(value) {
      case 0 ..< 24*3600: // within one day
        fm.allowedUnits = [.year, .day, .hour, .minute, .second]
      case 24*3600 ..< 24*3600*10: // within 1-10 days
        fm.allowedUnits = [.year, .day, .hour, .minute]
      case 24*3600*10 ..< 24*3600*365: // within 10-365 days
        fm.allowedUnits = [.year, .day, .hour]
      default: // within 365-1000 days
        fm.allowedUnits = [.year, .day]
      }
      fm.unitsStyle = .short
      let short = fm.string(from: value)
      fm.unitsStyle = .full
      let full = fm.string(from: value)
      if let short = short, let full = full {
        return (short, full)
      } else {
        return nil
      }
    }

    static var isMetric: Bool {
      let locale = NSLocale.current
      let metricSystem = locale.usesMetricSystem
      return metricSystem
    }

    static func paceFrom( _
      dt1: Date, to dt2: Date,
      distanceFrom loc1: CLLocation, to loc2: CLLocation) -> 
    ShortFullTupleStrings?
    {
      let timeInterval = dt2.timeIntervalSince(dt1)
      let dist = loc2.distance(from: loc1)
      let pace: ShortFullTupleStrings?
      if !dist.isZero {
        let paceV: TimeInterval
        if isMetric {
            paceV = timeInterval / (dist / 1000.0)
        } else {
            paceV = timeInterval / (dist / 1609.344)
        }
        pace = relatedTimeString(for: paceV)
      } else {
        pace = nil
      }
      return pace
    }
}

relatedTimeString 是一个辅助函数，用于获取格式为 # yrs、#days、#hrs、#min、#sec 和 #years 的完整格式的时间字符串，...，具体取决于没有零值。例如，短格式为 6 分 5 秒，完整格式为 6 分 5 秒。

这样，func 更加通用，并支持本地化和可访问性。