How can I change locale programmatically with Swift

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Here’s a way to change it on the fly with Swift, add an extension function to String:

extension String {
func localized(lang:String) ->String {

    let path = NSBundle.mainBundle().pathForResource(lang, ofType: "lproj")
    let bundle = NSBundle(path: path!)

    return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "")
}}

Swift 4:

extension String {
func localized(_ lang:String) ->String {

    let path = Bundle.main.path(forResource: lang, ofType: "lproj")
    let bundle = Bundle(path: path!)

    return NSLocalizedString(self, tableName: nil, bundle: bundle!, value: "", comment: "")
}}

then assuming you have the regular Localizable.strings set up with lang_id.lproj ( e.g. en.lproj, de.lproj etc. ) you can use this anywhere you need:

var val = "MY_LOCALIZED_STRING".localized("de")

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