CODEWITHSUNDEEP
iosstringswiftdoublensnumber
Vinicius Albino
Vinicius Albino

Reputation: 763

Negative String do decimal nsnumber

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.

Upvotes: 1

Views: 1218

Answers (3)

Arnaud
Arnaud

Reputation: 17737

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

Upvotes: 0

marcdaywalker
marcdaywalker

Reputation: 51

Quick way to convert a String into a NSNumber and then print it with 2 numbers after the comma

let value = "-2000"
let f = NSNumberFormatter()
f.numberStyle = .DecimalStyle      
let n = f.numberFromString(value)!
NSLog("%.2f", n.floatValue)

Upvotes: 0

phnmnn
phnmnn

Reputation: 13230

var amount = "-2000"  // String
var doubleNumber = Double(amount / 100)! // Double
var stringWithFormat = NSString(format: "formatted number %.2f", doubleNumber) // to get String with your format

When variable is Double. -20.0 and -20.00 are same value. Only if variable is String "-20.0" and "-20.00" are different

Upvotes: 1

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