iOS solution to convert large numbers to smaller format. See : http://stackoverflow.com/a/35504720/1661338

Int+Extenstion.swift

extension Int {

    func formatUsingAbbrevation () -> String {
        let numFormatter = NSNumberFormatter()

        typealias Abbrevation = (threshold:Double, divisor:Double, suffix:String)
        let abbreviations:[Abbrevation] = [(0, 1, ""),
                                           (1000.0, 1000.0, "K"),
                                           (100_000.0, 1_000_000.0, "M"),
                                           (100_000_000.0, 1_000_000_000.0, "B")]
                                           // you can add more !

        let startValue = Double (abs(self))
        let abbreviation:Abbrevation = {
            var prevAbbreviation = abbreviations[0]
            for tmpAbbreviation in abbreviations {
                if (startValue < tmpAbbreviation.threshold) {
                    break
                }
                prevAbbreviation = tmpAbbreviation
            }
            return prevAbbreviation
        } ()

        let value = Double(self) / abbreviation.divisor
        numFormatter.positiveSuffix = abbreviation.suffix
        numFormatter.negativeSuffix = abbreviation.suffix
        numFormatter.allowsFloats = true
        numFormatter.minimumIntegerDigits = 1
        numFormatter.minimumFractionDigits = 0
        numFormatter.maximumFractionDigits = 1

        return numFormatter.stringFromNumber(NSNumber (double:value))!
    }

}


let testValue:[Int] = [598, -999, 1000, -1284, 9940, 9980, 39900, 99880, 399880, 999898, 999999, 1456384, 12383474]

testValue.forEach() {
    print ("Value : \($0) -> \($0.formatUsingAbbrevation ())")
}


/////
// Result :
// Value : 598 -> 598
// Value : -999 -> -999
// Value : 1000 -> 1K
// Value : -1284 -> -1.3K
// Value : 9940 -> 9.9K
// Value : 9980 -> 10K
// Value : 39900 -> 39.9K
// Value : 99880 -> 99.9K
// Value : 399880 -> 0.4M
// Value : 999898 -> 1M
// Value : 999999 -> 1M
// Value : 1456384 -> 1.5M
// Value : 12383474 -> 12.4M

I don't find the license for this extension, is a MIT one?

I appreciate this work anyway. Thank you :)

I think there is an error. If you try to format the number 1000, the output is not 1K. The solution for this is to change the abbreviation's array to:

I hope I can help 👍