ios nsdecimalnumber string swift

Convert String to NSDecimalNumber

I try to convert a String into a NSDecimalNumber here it my code:

class func stringToDecimal (dataToDecimal: String) -> NSDecimalNumber {
let dataToDecimal = dataToDecimal.stringByReplacingOccurrencesOfString(",", withString: ".")
let decimalReturn = NSDecimalNumber(string: dataToDecimal)
if decimalReturn == NSDecimalNumber.notANumber(){
return 0.00
return decimalReturn

First I thought that maybe the , is wrong but even with . it doesn’t work.
The first print (before converting) shows e.g 80,00 but the print(decimalReturn) shows only 80

the if line is the just to check if the result is not a number.