In Swift 5, How to convert a Float to a String localized in order to display it in a textField? - swift

Question

I need to convert a Float to a localized String.
i write this function which is an extension from Float:
func afficherUnFloat() -> String {
let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .decimal
numberFormatter.locale = Locale.current
//numberFormatter.maximumFractionDigits = 2
//numberFormatter.maximumIntegerDigits = 6
if let result = numberFormatter.number(from: self) {
return numberFormatter.string(for: result) ?? "0"
}
return "0"
}
but it didn't work:
Here is the exemple
let xxx : Float = 111.222
myTextField.text = String(xxx).afficherUnFloat()
I have installed a pod KSNumericTextField, that limit the numbers in the textfield. He display it only if it is locally formatted.
When i run the app, it doesn't diplay 111,222 in a french region, or 111,222 in an arabic one.
nothing is dislpayed

Answer 1

Note that there is no need to cast your Float to NSNumber. You can use Formatter's method string(for: Any) instead of NumberFormatter's method string(from: NSNumber). Btw it will create a new number formatter every time you call this property. I would make your formatter static:
extension Formatter {
static let decimal: NumberFormatter = {
let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .decimal
numberFormatter.locale = .current
numberFormatter.maximumFractionDigits = 2 // your choice
numberFormatter.maximumIntegerDigits = 6 // your choice
return numberFormatter
}()
}
extension FloatingPoint {
var afficherUnFloat: String { Formatter.decimal.string(for: self) ?? "" }
}
let float: Float = 111.222
let string = float.afficherUnFloat // "111.22"

Answer 2

Here is finaly a solution:
extension Float {
func afficherUnFloat() -> String {
let text : NSNumber = self as NSNumber
let numberFormatter = NumberFormatter()
numberFormatter.numberStyle = .decimal
numberFormatter.locale = .current
numberFormatter.groupingSeparator = ""
numberFormatter.maximumFractionDigits = 2 // your choice
numberFormatter.maximumIntegerDigits = 6 // your choice
let result = numberFormatter.string(from: text) ?? ""
return result
}
}
With this, you can format every Float to a localized String, compatible with the keyboard choosen by the user, regardless of his locality or langage.
There is no need to force a special keyboard to have a specific decimal separator.
you can use it like this:
let myFloat: Float = 111.222
let myString :String = myFloat.afficherUnFloat()
myString will be displayed as the location requires