How can I get hundredths place instead of tenths place in output - swift

Question

When I enter an amount in the text field I get in total the amount in tenths place, so how can I get hundredths place instead of tenths place?
Also how can I get the tip percentage label an integer instead of a decimal?
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 = "$0.00"
totalBillLabel.text = "Bill Total"
billPerPersonLabel.text = "$0.00"
numberOfPersonLabel.text = "1"
self.amountTextField.becomeFirstResponder()
print("DefaultTipRate")
let tipPercentage : Double = NSUserDefaults.standardUserDefaults().doubleForKey("DefaultTipRate")
TipPercentageLabel.text = self.numberFormatter.stringFromNumber(tipPercentage)
}
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 = 2
numberFormatter.maximumFractionDigits = 2
TipPercentageLabel.text = String(format: "%.0f%%", tipPercentage)
numberOfPersonLabel.text = "\(numberOfPerson)"
}
#IBAction func sliderTipChanged(sender: AnyObject) {
tipPercentage = Double(round(tipSlider.value)) / 100
refreshCalculation()
}
#IBAction func StepperPersonChanged(sender: AnyObject) {
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()
}
SETTINGS VIEW CODE
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.
}
#IBAction func changeValue(sender: UISegmentedControl) {
var tipRate = [0.05, 0.10, 0.15, 0.20, 0.25, 0.30]
tipRates = (tipRate[tipControl.selectedSegmentIndex])
delegate?.tipPercentageChanged(tipRates!); print("(tipRates)")
NSUserDefaults.standardUserDefaults().setDouble(tipRates!, forKey: "DefaultTipRate")
NSUserDefaults.standardUserDefaults().synchronize()
}
}

Answer 1

Since you are using NSNumberFormatter, set maximumFractionDigits and minimumFractionDigits properties to 2:
let numberFormatter = NSNumberFormatter()
numberFormatter.maximumFractionDigits = 2
numberFormatter.minimumFractionDigits = 2
let str = numberFormatter.stringFromNumber(14.7) // "14.70"
Alternatively, you could use the String(format:) constructor:
let str = String(format: "%.2f", 14.7) // "14.70"
For your tip percentage, since you are storing it as a decimal percentage, you can do:
let tipPercentage: Double = 0.17
TipPercentageLabel.text = String(format: "%.0f%%", tipPercentage * 100) // "17%"