Formatting Numbers in Swift 3 - swift

Question

I want to format number to this: 123.234.234.234 from 123234234234 depends on what the user types into the text field.
I don't want to manage currency, it's not about currency, it is about the user has to type in a number and this number should be formatted correctly to be easier to read.
Not with a comma, with a dot.
I found only currency stuff in the whole research

Answer 1

What you are looking for is probably groupingSeparator of NumberFormatter
let formater = NumberFormatter()
formater.groupingSeparator = "."
formater.numberStyle = .decimal
let formattedNumber = formater.string(from: number)

Answer 2

There's actually much easier solution (there is no need to create NumberFormatter instance) and it takes into account the user's language:
let result = String(format: "%ld %#", locale: Locale.current, viewCount, "views")
Result for value 1000000 with English:
1,000,000
Russian:
1 000 000
p.s. in Android it's exactly the same String.format(Locale.getDefault(), "%,d %s", viewCount, "views")

Answer 3

You can do it with NumberFormatter:
let yourNumber = 123234234234
let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = NumberFormatter.Style.decimal
numberFormatter.groupingSeparator = "."
let formattedNumber = numberFormatter.string(from: NSNumber(value:yourNumber))

Answer 4

Details
Xcode 9.2, Swift 4
Xcode 10.2 (10E125), Swift 5
Solution
import Foundation
extension String { var toLocale: Locale { return Locale(identifier: self) } }
extension NumberFormatter {
convenience init(numberStyle: NumberFormatter.Style, groupingSeparator: String?, decimalSeparator: String?) {
self.init()
set(numberStyle: numberStyle, groupingSeparator: groupingSeparator, decimalSeparator: decimalSeparator)
}
convenience init(numberStyle: NumberFormatter.Style, locale: Locale) {
self.init()
set(numberStyle: numberStyle, locale: locale)
}
func set(numberStyle: NumberFormatter.Style, groupingSeparator: String?, decimalSeparator: String?) {
self.locale = nil
self.numberStyle = numberStyle
self.groupingSeparator = groupingSeparator
self.decimalSeparator = decimalSeparator
}
func set(numberStyle: NumberFormatter.Style, locale: Locale?) {
self.numberStyle = numberStyle
self.locale = locale
}
}
extension Numeric {
func format(formatter: NumberFormatter) -> String? {
if let num = self as? NSNumber { return formatter.string(from: num) }
return nil
}
}
Usage
let formatter = NumberFormatter(numberStyle: .decimal, locale: "fr_FR".toLocale)
print(value.format(formatter: formatter))
formatter.set(numberStyle: .decimal, groupingSeparator: " ", decimalSeparator: ".")
print(value.format(formatter: formatter))
Full sample
Do not forget to add the solution code here
func test<T: Numeric>(value: T) {
print("=========================================================")
print("\(T.self), value = \(value)")
let formatter = NumberFormatter(numberStyle: .decimal, locale: "fr_FR".toLocale)
print(value.format(formatter: formatter) ?? "nil")
formatter.set(numberStyle: .currency, locale: "de_DE".toLocale)
print(value.format(formatter: formatter) ?? "nil")
formatter.set(numberStyle: .decimal, groupingSeparator: " ", decimalSeparator: ".")
print(value.format(formatter: formatter) ?? "nil")
}
func print(title: String, value: String?) {
if let value = value { print("\(title) \(value)") }
}
test(value: Int(10000))
test(value: Double(10000.231))
test(value: Float(10000.231))
Result
=========================================================
Int, value = 10000
10 000
10.000,00 €
10 000
=========================================================
Double, value = 10000.231
10 000,231
10.000,23 €
10 000.231
=========================================================
Float, value = 10000.231
10 000,231
10.000,23 €
10 000.231

Answer 5

swift 4
extension Int {
func formatnumber() -> String {
let formater = NumberFormatter()
formater.groupingSeparator = "."
formater.numberStyle = .decimal
return formater.string(from: NSNumber(value: self))!
}
}

Answer 6

For leading zeros (Swift 5.2)
String(format: "%02d", intNumber) // 6 -> "06"
String(format: "%03d", intNumber) // 66 -> "066"
String(format: "%04d", intNumber) // 666 -> "0666"
from: https://stackoverflow.com/a/25566860/1064316

Answer 7

For swift 4, I implemented an extension where I can choose the formatting or use default one if none is selected.
extension Int {
func formatnumber(groupingSeparator: String?) -> String {
let formater = NumberFormatter()
formater.groupingSeparator = (groupingSeparator != nil) ? groupingSeparator! : ","
formater.numberStyle = .decimal
return formater.string(from: NSNumber(value: self))!
}
}

Answer 8

My script as an example:
1) Add extension to project
extension String {
public func subString(startIndex: String.Index, endIndex: String.Index) -> String {
return String(self[startIndex...endIndex])
}
public func subString(_ from: Int, _ to: Int) -> String {
let startIndex = self.index(self.startIndex, offsetBy: from)
let endIndex = self.index(self.startIndex, offsetBy: to)
return String(self[startIndex...endIndex])
}
}
2) Create file Utilites.swift and add my method
public func priceNumFormat(_ number: String)->String{
var formattedNumber = number
var print = number
var prefix = ""
if number.range(of:"-") != nil {
let index = number.index(of:"-")
formattedNumber.remove(at: index ?? formattedNumber.endIndex)
prefix = "-"
}
if formattedNumber.range(of:".") != nil {
let index = formattedNumber.index(of:".")
formattedNumber = formattedNumber.subString(startIndex: formattedNumber.startIndex, endIndex: index ?? formattedNumber.endIndex)
formattedNumber.remove(at: index ?? formattedNumber.endIndex)
}
if formattedNumber.count == 8 //10 000 000
{
let num0 = formattedNumber.subString(0, 1)
let num1 = formattedNumber.subString(2, 4)
let num2 = formattedNumber.subString(5, 7)
print = "\(num0) \(num1) \(num2)"
}
if formattedNumber.count == 7 //1 000 000
{
let num0 = formattedNumber.subString(0, 0)
let num1 = formattedNumber.subString(1, 3)
let num2 = formattedNumber.subString(4, 6)
print = "\(num0) \(num1) \(num2)"
}
if formattedNumber.count == 6 //100 000
{
let num0 = formattedNumber.subString(0, 2)
let num1 = formattedNumber.subString(3, 5)
print = "\(num0) \(num1)"
}
if formattedNumber.count == 5 //10 000
{
let num0 = formattedNumber.subString(0, 1)
let num1 = formattedNumber.subString(2, 4)
print = "\(num0) \(num1)"
}
if formattedNumber.count == 4 //1 000
{
let num0 = formattedNumber.subString(0, 0)
let num1 = formattedNumber.subString(1, 3)
print = "\(num0) \(num1)"
}
if formattedNumber.count == 3 //100
{
print = formattedNumber
}
if prefix.count > 0
{
print = "- \(print)"
}
return print;
}
3) Add code in your UIController
let utils = Utilites()
private func test(){
var price = self.utils.priceNumFormat("-12345678.000")
print("\(price)") //-12 345 678
price = self.utils.priceNumFormat("-1234567.000")
print("\(price)") //-1 234 567
price = self.utils.priceNumFormat("-123456.000")
print("\(price)") //-123 456
price = self.utils.priceNumFormat("-12345.000")
print("\(price)") //-12 345
price = self.utils.priceNumFormat("-1234.000")
print("\(price)") //-1 234
price = self.utils.priceNumFormat("-123.000")
print("\(price)") //-123
}