localizeWithFormat and variadic arguments in Swift

Question

I am trying to create a String extension to do something like that

\"My name is %@. I am %d years old\".localizeWithFormat(\"John\", 30)

w

Answer 1

In Swift 3

func localize(key: String, arguments: CVarArg...) -> String {
  return String(format: NSLocalizedString(key, comment: ""), arguments)
}

Answer 2

This should be pretty simple just change your parameters as follow:

extension String {
    func localizeWithFormat(name:String,age:Int, comment:String = "") -> String {
        return String.localizedStringWithFormat( NSLocalizedString(self, comment: comment), name, age)
    }
}

"My name is %@. I am %d years old".localizeWithFormat("John", age: 30)  // "My name is John. I am 30 years old"

init(format:locale:arguments:)

extension String {
    func localizeWithFormat(args: CVarArgType...) -> String {
        return String(format: self, locale: nil, arguments: args)
    }
    func localizeWithFormat(local:NSLocale?, args: CVarArgType...) -> String {
        return String(format: self, locale: local, arguments: args)
    }
}
let myTest1 = "My name is %@. I am %d years old".localizeWithFormat(NSLocale.currentLocale(), args: "John",30)
let myTest2 = "My name is %@. I am %d years old".localizeWithFormat("John",30)

Answer 3

This allows localized string with variadic arguments:

extension String {
      func localizedStringWithVariables(vars: CVarArgType...) -> String {
        return String(format: NSLocalizedString(self, tableName: nil, bundle: NSBundle.mainBundle(), value: "", comment: ""), arguments: vars)
      }
}

Call using:

"Hello, %@. Your surname is: %@.".localizedStringWithVariables("Neil", "Peart")