example.swift

let subtitleText = SoundPackStrings.DownloadSizeShort(size)

LocalizedString.swift

//
//  LocalizedString.swift
//  Medly
//
//  Created by Jayson Rhynas on 2016-03-29.
//  Copyright © 2016 Medly Labs Inc. All rights reserved.
//

import Foundation

func LocalizedString(_ key: String, tableName: String? = nil) -> String {
    return Bundle.main.localizedString(forKey: key, value: nil, table: tableName)
}

SoundPackStrings.swift

//
//  SoundPackStrings.swift
//  Medly
//
//  Created by Jayson Rhynas on 2016-03-26.
//  Copyright © 2016 Medly Labs Inc. All rights reserved.
//

import Foundation

class SoundPackStrings: NSObject {
    private class func LS(_ key: String, _ args: CVarArg...) -> String {
        return String(format: LocalizedString(key, tableName: "SoundPacks"), locale: Locale.current, arguments: args)
    }
    
    class var Starter:           String { return LS("Starter") }
    class var Essentials:        String { return LS("Essentials") }
    class var Rock:              String { return LS("Rock") }
    class var Jazz:              String { return LS("Jazz") }
    class var Classical:         String { return LS("Classical") }
    class var House:             String { return LS("House") }
    class var Trance:            String { return LS("Trance") }
    class var FutureBass:        String { return LS("FutureBass") }
    class var Band:              String { return LS("Band") }
    class var Demo:              String { return LS("Demo") }
    class var DemoFootnote:      String { return LS("DemoFootnote") }
    
    class var FullName: (_ pack: String) -> String {
        return { pack in LS("FullName", pack) }
    }
    
    
    class var IncludedString: String { return LS("IncludedString") }
    
    class var DownloadSize: (_ size: String) -> String {
        return { size in LS("DownloadSize", size) }
    }
    
    class var DownloadSizeShort: (_ size: String) -> String {
        return {size in LS("DownloadSizeShort", size) }
    }
    
    class var BandSubtitle: (_ numOfInsts: Int) -> String {
        return {numOfInsts in LS("BandSubtitle", numOfInsts) }
    }
    
    class var BandTotalCost: (_ cost: String) -> String {
        return { cost in LS("BandTotalCost", cost) }
    }
    
    class var BandDescription: (_ cost: String? ) -> String {
        return { cost in
            let desc1 = LS("BandDesc1")
            
            if let cost = cost {
                let desc2 = LS("BandDesc2", cost)
                return "\(desc1)\n\n\(desc2)"
            }
            
            return desc1
        }
    }
}