For get JSON localy

GetJSONLocalFile.Swift

class GetJSONLocalFile {
  
    class func fromFile(fileName: String) -> String? {
        guard let path: String = NSBundle.mainBundle().pathForResource(fileName, ofType: "json") else {
            print("Error!, Unable to load  \(fileName).json")
            return nil
        }
        do {
            guard let data: String = try String(contentsOfFile: path) else {
                return nil
            }
            
            return data
        } catch {
            fatalError("Error, Unable to parse  \(fileName).json")
        }
        return nil
    }
}