Change app language programmatically WITHOUT restarting the app - swift

Question

When I change the language from my app it doesn't take effect until I close the app and restart it. I don't want to restart it. I tried also presenting rootViewController but doesn't work. Is there any solution?

Answer 1

You can change the language in every Single of ViewControllers inside ViewDidLoad() So when User Clicked on the purposed Language Save it with UserDefaults.standard.set("En", forKey: "languages") So when you've saved languages You can Get the Selected languages by UserDefaults.standard.String(forKey: "languages") Which will give you En String Value
override func viewDidLoad() {
super.viewDidLoad()
//Get Language Func
GetLanguage()
}
#IBAction func ChangeToEn(_ sender:Any) {
SaveSelectedLanguage(SomeString: "En")
}
func SaveSelectedLanguage(SomeString:String) {
//Save Selected Language
UserDefaults.standard.set("En", forKey: SomeString)
//GetResult By Get Language Func
GetLanguage()
}
func GetLanguage {
//initializing
Switch UserDefualts.standard.string(forkey:"languages") {
case "En":
lbl.text = "Hello World"
case "Tr":
lbl.text = "Merhaba Dunya"
case "Fa"
lbl.text = "سلام دنیا"
}
}

Answer 2

if you want to get the phone language once the app is lunch like in settings
class ViewController: UIViewController {
#IBOutlet weak var HeadTitle: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
//when You are trying to change the language
//Get Phone Language
GetPhoneLanguage()
//Get Language
GetLanguege()
}
#IBAction func SaveEn(_ sender: Any) {
SaveLanguage(Value: "en")
GetLanguege()
}
#IBAction func SaveTr(_ sender: Any) {
SaveLanguage(Value: "tr")
GetLanguege()
}
func SaveLanguage(Value:String){
UserDefaults.standard.set(Value, forKey: "AppleLanguages")
UserDefaults.standard.synchronize()
}
func GetPhoneLanguage(){
if UserDefaults.standard.string(forKey: "AppleLanguages") == nil {
let preferredLanguage = Locale.preferredLanguages[0] as String
print (preferredLanguage) //en-US
let arr = preferredLanguage.components(separatedBy: "-")
let deviceLanguage = arr.first
UserDefaults.standard.set(deviceLanguage!, forKey: "AppleLanguages")
}
}
func GetLanguege() {
switch UserDefaults.standard.string(forKey: "AppleLanguages") {
case "en":
HeadTitle.text = "Hello World"
case "tr":
HeadTitle.text = "Merhaba Dunya"
default:
print("No Languages")
}
}
}