iterating through plist file and storing data in array or Dictionary

Question

I am new in swift programing. I'm trying to learn plist file. I have a plist file which has data of Country, State and city. I want to iterate through the data of plist file. But I can't understand how to create an array or dictionary to store the data for country, state and City. Can you help me with how to manipulate the following data of plist file.

    {
Country =     (
            {
        CountryName = India;
        State =             (
                            {
                City =                     (
                    Ahmedabad,
                    Vadodara,
                    Surat,
                    Aanand,
                    Bharuch
                );
                StateName = Gujrat;
            },
                            {
                City =                     (
                    Mumbai,
                    Pune,
                    Nagpur,
                    Nasik,
                    Thane
                );
                StateName = Maharastra;
            },
                            {
                City =                     (
                    Kochi,
                    Kanpur,
                    Alleppey,
                    Thrissur,
                    Thiruvananthapuram
                );
                StateName = Kerala;
            }
        );
            },

Answer 1

// swift 3 using structure. Manually parsing of data.

struct ListData {
    var countries : [Country]?

    init(dict:[String:AnyObject]) {
        if let countryDict = dict["Country"] as? [[String:AnyObject]] {
            self.countries = parseArray(dictArray: countryDict)
        }
    }

    func parseArray(dictArray:[[String:AnyObject]]) -> [Country] {
        var array = [Country]()
        for dict in dictArray {
            let country = Country(dict: dict)
            array.append(country)
        }
        return array
    }
}
struct Country  {
    var countryName : String?
    var states : [State]?

    init(dict:[String:AnyObject]) {
        countryName = dict["CountryName"] as? String

        if let stateDict = dict["State"] as? [[String:AnyObject]] {
            states = parseArray(dictArray: stateDict)
        }
    }

    func parseArray(dictArray:[[String:AnyObject]]) -> [State] {
        var array = [State]()
        for dict in dictArray {
            let state = State(dict: dict)
            array.append(state)
        }
        return array
    }
}
struct State {
    var stateName : String?
    var cities : [String]?

    init(dict:[String:AnyObject]) {
        self.stateName = dict["StateName"] as? String

        if let cityDict = dict["City"] as? [AnyObject] {
            cities = parseArray(dictArray: cityDict)
        }
    }

    func parseArray(dictArray:[AnyObject]) -> [String] {
        var array = [String]()
        for dict in dictArray {
            array.append(dict as! String)
        }
        return array
    }
}

 var listData : ListData? = nil

 if let path = Bundle.main.path(forResource: "Property List" , ofType: "plist") {
            let rootDict = NSDictionary(contentsOfFile: path) as? [String:AnyObject]
            listData = ListData(dict: rootDict!)
    }

// Using swift 4 and codable protocol.

struct ListData : Codable {
    var countries : [Country]?

    enum CodingKeys : String, CodingKey {
        case countries =  "Country"
    }

}

struct Country : Codable {
    var countryName : String?
    var states : [State]?

    enum CodingKeys : String, CodingKey {
        case countryName =  "CountryName"
        case states = "State"
    }

}

struct State : Codable {
    var stateName : String?
    var cities : [String]?

    enum CodingKeys : String, CodingKey {
        case stateName =  "StateName"
        case cities = "City"
    }

}

var listData : ListData? = nil
if  let url = Bundle.main.url(forResource: "Property List", withExtension: "plist") {
            if let data = try? Data(contentsOf: url) {
                let decoder = PropertyListDecoder()
                do {
                    listData = try decoder.decode(ListData.self, from: data)
                } catch (let err) {
                    print(err.localizedDescription)
                }
            }
        }