小费计算器应用程序和显示数据的问题

Question

大家好我的代码需要一些帮助当我 select 设置中的默认小费率并返回时，百分比标签似乎乘以 100。我给一位教授发了一封电子邮件，他告诉我：

(("It looks like it's because you are saving the default tip rate as "20" 而不是 "0.20" 所以当你乘以 "100" 你得到 "2000" 而不是 "20"."))) 有几种方法可以解决这个，但最简单的方法是在计算小费金额时除以 100。

非常感谢有人帮助我制作我需要将金额除以 100 的代码行。下面我将留下我的代码的一些屏幕截图。 Views的截图顺序是：

这是我的 MainViewController 代码

import UIKit
class ViewController: UIViewController, SettingsDelegate {
// Inputs
@IBOutlet weak var amountTextField: UITextField!
//Labels
@IBOutlet weak var TipPercentageLabel: UILabel!
@IBOutlet weak var numberOfPersonLabel: UILabel!
@IBOutlet weak var tipAmountLabel: UILabel!
@IBOutlet weak var totalBillLabel: UILabel!
@IBOutlet weak var billPerPersonLabel: UILabel!
//Slider & Stepper
@IBOutlet weak var tipSlider: UISlider!
@IBOutlet weak var personsStepper: UIStepper!
//Variables
var tipPercentage : Double = NSUserDefaults.standardUserDefaults().doubleForKey("DefaultTipRate") ?? 0.20
var numberOfPerson:Int = 1
let numberFormatter:NSNumberFormatter = NSNumberFormatter()


override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    tipAmountLabel.text = "[=10=].00"
    totalBillLabel.text = "Bill Total"
    billPerPersonLabel.text = "[=10=].00"
    numberOfPersonLabel.text = "1"
    self.amountTextField.becomeFirstResponder()

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


    tipSlider.minimumValue = 0
    tipSlider.maximumValue = 100
    tipSlider.value = 20
    tipSlider.addTarget(self, action: "sliderTipChanged:", forControlEvents: .ValueChanged)

    personsStepper.minimumValue = 1
    personsStepper.maximumValue = 30
    personsStepper.value = 1
    personsStepper.addTarget(self, action: "sliderPersonChanged:", forControlEvents: .ValueChanged)

    amountTextField.text = ""

    refreshCalculation()

}

@IBAction func OnEditingFieldBill(sender: AnyObject) {

    refreshCalculation()
}

func refreshCalculation() {

    numberFormatter.numberStyle = NSNumberFormatterStyle.DecimalStyle
    if let amount = numberFormatter.numberFromString(amountTextField.text!) as? Double {

        let tipAmount = amount * tipPercentage
        let totalBill = amount + tipAmount
        let billPerPerson = totalBill / Double(numberOfPerson)
        numberFormatter.numberStyle = NSNumberFormatterStyle.CurrencyStyle
        tipAmountLabel.text = numberFormatter.stringFromNumber(tipAmount)
        totalBillLabel.text = numberFormatter.stringFromNumber(totalBill)
        billPerPersonLabel.text = numberFormatter.stringFromNumber(billPerPerson)

    } else {

        tipAmountLabel.text = "-"
        totalBillLabel.text = "-"
        billPerPersonLabel.text = "-"
    }

    numberFormatter.numberStyle = NSNumberFormatterStyle.PercentStyle
    numberFormatter.minimumFractionDigits = 1
    numberFormatter.maximumFractionDigits = 1
    TipPercentageLabel.text = self.numberFormatter.stringFromNumber(tipPercentage)

   numberOfPersonLabel.text = "\(numberOfPerson)"

} 

@IBAction func sliderTipChanged(sender: UISlider) {

    tipPercentage = Double(round(tipSlider.value)) / 100
    refreshCalculation()
}


@IBAction func StepperPersonChanged(sender: UIStepper) {
    numberOfPerson = Int(round(personsStepper.value))
    refreshCalculation()
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if let SettingsViewController = segue.destinationViewController as? SettingsViewController {
        SettingsViewController.delegate = self
        refreshCalculation()
            }
        }
func tipPercentageChanged(newValue: Double) {
    TipPercentageLabel.text = "\(newValue)%"
    tipPercentage = newValue
    refreshCalculation()
}
}

这里是设置视图代码

import UIKit
protocol SettingsDelegate{
func tipPercentageChanged(newValue : Double)
}
class SettingsViewController: UIViewController {
@IBOutlet weak var tipControl: UISegmentedControl!
var tipRates: Double?
var destName : String!
var delegate :SettingsDelegate?

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
}

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

Answer 1

在设置视图中进行更改就足够了，因为您已经为其指定了正确的费率名称，您还应该将其设为费率

var tipRate = [5, 10, 15, 20, 25, 30]

到

var tipRate = [0.05, 0.10, 0.15, 0.20, 0.25, 0.30]

您也可以删除下一行，因为它不需要强制转换为 Double。

小费计算器应用程序和显示数据的问题

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