ObjC/Cocoa class for converting size to human-readable string?

Question

Is there a simple way to do something like..

[NSMagicDataConverter humanStringWithBytes:20000000]

..which would return \"19.1MB\"?

Answer 1

I know the questions is for Obj C but if anyone looking for a swift version:

 public static func fileSizeDisplay(fromBytes:Int) -> String {
        let display = ["bytes","KB","MB","GB","TB","PB"]
        var value:Double = Double(fromBytes)
        var type = 0
        while (value > 1024){
            value /= 1024
            type = type + 1

        }
        return "\(String(format:"%g", value)) \(display[type])"

    }