Swift – iOS – Read Language JSON File Into Controls

If you have an app that doesn’t use the internet or can’t use the internet but still want basic multi-language capability the below will help.

First add some labels and buttons. In adding the buttons add it twice (once as IBOutlet and then IBAction)

Create a JSON file, in my example I named mine data.json

{
    "english":[
               {
               "Sunrise":"Sun Rise",
               "Sunset":"Sunset",
               "ShareBrief":"Share Brief",
               "ShareDetailed":"Share Detailed"
               }
               ],
    "spanish":[
               {
               "Sunrise":"Salida del Sol",
               "Sunset":"Puesta de Sol",
               "ShareBrief":"Compartir Breve",
               "ShareDetailed":"Compartir Detallado"
               }
               ],
    "french":[
              {
              "Sunrise":"Lever du Soleil",
              "Sunset":"Le Coucher du Soleil",
              "ShareBrief":"Partager Bref",
              "ShareDetailed":"Partager Détaillé"
              }
              ]
}

@IBAction func btnButtonTest(_ sender: Any) {
   GetLanguage(language: "english");
}
@IBOutlet weak var btnButtonTestLabel: UIButton!
    
@IBAction func btnButtonTest1(_ sender: Any) {
   GetLanguage(language: "spanish");
}
    
@IBOutlet weak var btnButtonTestLabel1: UIButton!

@IBOutlet weak var lblLabelTest: UILabel!
    
@IBOutlet weak var lblLabelTest1: UILabel!

override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
     
        // Get device language
        let dLanguageLocale = NSLocale.preferredLanguages[0]
        print(dLanguageLocale);
        let dLanguage = dLanguageLocale.components(separatedBy: "-")
        
        switch (dLanguage[0])
        {
        case "en":
            GetLanguage(language: "english");
        case "es":
            GetLanguage(language: "spanish");
        case "fr":
            GetLanguage(language: "french");
        default:
            GetLanguage(language: "english");
        }        
    }

func GetLanguage(language: String)
    {
        if let path = Bundle.main.url(forResource: "data", withExtension: "json") {
            
            do {
                let jsonData = try Data(contentsOf: path, options: .mappedIfSafe)
                do {
                    if let jsonResult = try JSONSerialization.jsonObject(with: jsonData, options: JSONSerialization.ReadingOptions(rawValue: 0)) as? NSDictionary {
                        if let personArray = jsonResult.value(forKey: language) as? NSArray {
                            for (_, element) in personArray.enumerated() {
                                if let element = element as? NSDictionary {
                                    let sSunrise = element.value(forKey: "Sunrise") as! String
                                    print(sSunrise)
                                    lblLabelTest4.text = sSunrise
                                    let sSunset = element.value(forKey: "Sunset") as! String
                                    print(sSunset)
                                    lblLabelTest5.text = sSunset
                                    let sBrief = element.value(forKey: "ShareBrief") as! String
                                    print(sBrief)
                                    btnButtonTestLabel.setTitle(sBrief, for: .normal)
                                    let sDetailed = element.value(forKey: "ShareDetailed") as! String
                                    print(sDetailed)
                                    btnButtonTestLabel1.setTitle(sDetailed, for: .normal)
                                }
                            }
                        }
                    }
                } catch let error as NSError {
                    print("Error: \(error)")
                }
            } catch let error as NSError {
                print("Error: \(error)")
            }
        }
    }