Localizing Plurals in Swift

example.swift

print(~"foo")
// bar

print("LOCALIZED STRING KEY"~[0])
// FORMAT OF STRING WITH ZERO HERE

print("LOCALIZED STRING KEY"~[1])
// FORMAT OF STRING WITH ONE HERE

print("LOCALIZED STRING KEY"~[7])
// FORMAT OF STRING WITH 7 HERE

Localizable.strings

// the strings without format can be included here

"foo" = "bar";

Localizable.stringsdict

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>LOCALIZED STRING KEY</key>
	<dict>
		<key>NSStringLocalizedFormatKey</key>
		<string>FORMAT OF STRING WITH %#@VARIABLE@ HERE</string>
		<key>VARIABLE</key>
		<dict>
			<key>NSStringFormatSpecTypeKey</key>
			<string>NSStringPluralRuleType</string>
			<key>NSStringFormatValueTypeKey</key>
			<string>zd</string>
			<key>zero</key>
			<string>ZERO</string>
			<key>one</key>
			<string>ONE</string>
			<key>two</key>
			<string></string>
			<key>few</key>
			<string></string>
			<key>many</key>
			<string></string>
			<key>other</key>
			<string>%lu</string>
		</dict>
	</dict>
</dict>
</plist>

String.swift

import UIKit

prefix func ~ (key: String) -> String {
    return NSLocalizedString(key, comment: "No Comment")
}

infix operator ~ {associativity left precedence 150}

func ~ (key: String, args: [CVarArgType]) -> String {
    let localizedString = NSLocalizedString(key, comment: "No Comment")
    return String(format:localizedString, arguments:args)
}