Swizzling NSLocalizedString

Swizzling of Apple's APIs

Tolgee optionally supports swizzling of Bundle.localizedString, which is being used internally by NSLocalizedString function.

In order to enable swizzling, set enviromental variable TOLGEE_ENABLE_SWIZZLING=true in your scheme settings. Refer to our UIKit example to see it in action.

Following calls will then be backed by the Tolgee SDK:

Bundle.main.localizedString(forKey: "welcome_message")
NSLocalizedString("welcome_message", comment: "")

Regular string parameters are supported as well:

let userName = "John"
let welcomeMessage = String(format: NSLocalizedString("welcome_user", comment: ""), userName)

NOTE: Plural strings are currently not supported and will fall back to using the string bundled with the app.

warning

Method swizzling is a powerful technique, but it can lead to unexpected behavior if not used carefully, especially if there is multiple SDKs swizzling the same APIs. Make sure to test your application thoroughly after enabling swizzling.