Swift playground - How to convert a string with comma to a string with decimal - swift

Question

I'm new in the Swift world.
How can I converting a String with a comma to a String with a decimal?
The code work's fine with a dot (.)
The problem is when I'm using a comma (,) ... with: var price
The origin of the problem is the Decimal french keyboard use a comma (,) instead of a dot (.)
Don't know exactly how to use NSNumberFormatter or generatesDecimalNumbers if it's the key. There's probebly more than one options.
//The answer change if "2,25" or "2.25" is used.
var price : String = "2,25"
var priceFloat = (price as NSString).floatValue
//I need to have 2.25 as answer.
var costString = String(format:"%.2f", priceFloat)
Thank's for your time and your help!

Answer 1

update: Xcode 8.2.1 • Swift 3.0.2
You can use NumberFormatter() to convert your string to number. You just need to specify the decimalSeparator as follow:
extension String {
static let numberFormatter = NumberFormatter()
var doubleValue: Double {
String.numberFormatter.decimalSeparator = "."
if let result = String.numberFormatter.number(from: self) {
return result.doubleValue
} else {
String.numberFormatter.decimalSeparator = ","
if let result = String.numberFormatter.number(from: self) {
return result.doubleValue
}
}
return 0
}
}
"2.25".doubleValue // 2.25
"2,25".doubleValue // 2.25
let price = "2,25"
let costString = String(format:"%.2f", price.doubleValue) // "2.25"
You should do the currency formatting also with NumberFormat, so create a read-only computed property currency extending FloatingPoint protocol to return a formatted string from the String doubleValue property.
extension NumberFormatter {
convenience init(style: Style) {
self.init()
self.numberStyle = style
}
}
extension Formatter {
static let currency = NumberFormatter(style: .currency)
}
extension FloatingPoint {
var currency: String {
return Formatter.currency.string(for: self) ?? ""
}
}
let costString = "2,25".doubleValue.currency // "$2.25"
Formatter.currency.locale = Locale(identifier: "en_US")
"2222.25".doubleValue.currency // "$2,222.25"
"2222,25".doubleValue.currency // "$2,222.25"
Formatter.currency.locale = Locale(identifier: "pt_BR")
"2222.25".doubleValue.currency // "R$2.222,25"
"2222,25".doubleValue.currency // "R$2.222,25"

Answer 2

You can use for this Swift 3:
let currentAmount = "2,50"
currentAmount = currentAmount.replacingOccurrences(of: ",", with: ".")
print(currentAmount) // "2.50\n"

Answer 3

var price = "2,25"
price = price.replacingOccurrences(of: ",", with: ".")
var priceFloat = (price as NSString).floatValue

Answer 4

Nullable extension version:
extension String
{
static let customNumberFormatter = NumberFormatter()
var doubleValue: Double? {
String.customNumberFormatter.decimalSeparator = "."
if let result = String.customNumberFormatter.number(from: self) {
return result.doubleValue
} else {
String.customNumberFormatter.decimalSeparator = ","
if let result = String.customNumberFormatter.number(from: self) {
return result.doubleValue
}
}
return nil
}
}

Answer 5

EDIT: Updated to work with the current version of Swift:
let amount = "8,35"
var counter: Int = 0
var noCommaNumber: String!
for var carattere in (amount) {
if carattere == "," { carattere = "." }
if counter != 0 { noCommaNumber = "\(noCommaNumber ?? "\(carattere)")" + "\(carattere)" } else { noCommaNumber = "\(carattere)" } // otherwise first record will always be nil
counter += 1
}
let importo = Float(noCommaNumber)