Negative String do decimal nsnumber

Question

Im trying to convert a String to a decimal Double or NSNumber.

Heres my string :

"-2000" or "2000"

which should become :

-20.00 or 20.00

already tried :

print("NSNumber \(NSNumberFormatter().numberFromString(amount)!.decimalValue)")
print("Double \(Double(amount))")

but when its negative return nil, or when its positive returns only one number after the comma.

Answer 1

You can do

Double(("-2000" as NSString).doubleValue / 100)

I would create a simple extension (String+decimalPrice.swift) for that

extension String {
    var decimalPrice: Double {
        return (self as NSString).doubleValue / 100
    }
}

let price = "-999".decimalPrice
print(price) # -> -9.99