how to change storyboard based on language at runtime in swift - ios

Question

To support localization I have made two Main.stroyboard, one for Persian and one for English (rather than just have .string file)
It acts good for different localization.
Now I want to have language options in my app, so user can change the language of app. For this I want to load correct storyboard based on user selection.
what i am using is as following:
let path = Bundle.main.path(forResource: "fa", ofType: "lproj")
let bundle = Bundle(path: path!)
let nsb = UIStoryboard.init(name: "Main", bundle: bundle)
let vc = nsb.instantiateViewController(withIdentifier: "MainController")
self.navigationController?.pushViewController(vc, animated: true)
Although it changes the Storyboard based on user selection but all the images are missing!
is there any reason for that?
is my method statndard?

Answer 1

You can change it at runtime:
define a new bundle class:
var bundleKey: UInt8 = 0
class AnyLanguageBundle: Bundle {
override func localizedString(forKey key: String,
value: String?,
table tableName: String?) -> String {
guard let path = objc_getAssociatedObject(self, &bundleKey) as? String,
let bundle = Bundle(path: path) else {
return super.localizedString(forKey: key, value: value, table: tableName)
}
return bundle.localizedString(forKey: key, value: value, table: tableName)
}
}
and then extend Bundle class like this:
extension Bundle {
class func setLanguage(_ language: String) {
defer {
object_setClass(Bundle.main, AnyLanguageBundle.self)
}
objc_setAssociatedObject(Bundle.main, &bundleKey, Bundle.main.path(forResource: language, ofType: "lproj"), .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
}
}
and finally for change language at runtime use this:
Bundle.setLanguage("tr")
Bundle.setLanguage("en")..
when you change the language you should reload your view controller by instantiating again your viewcontroller from its storyboard because we changed our bundle.