How I can read nested array at JSON file by SWIFT 2 - ios

Question

I wrote this code to read country at table view from this JSON file :
JSON:
[5]
0: {
"country": "Afghanistan"
"code": "AF"
}-
1: {
"country": "Åland Islands"
"code": "AX"
}-
2: {
"country": "Albania"
"code": "AL"
}-
3: {
"country": "Algeria"
"code": "DZ"
}-
4: {
"country": "American Samoa"
"code": "AS"
}
My code :
import UIKit
import CoreData
class ViewController: UIViewController, UITableViewDataSource,UITableViewDelegate {
#IBOutlet weak var tableCountryView: UITableView!
var json_url = "........ my url here ......... "
var TableData:Array< datastruct > = Array < datastruct >()
enum ErrorHandler:ErrorType
{
case ErrorFetchingResults
}
struct datastruct
{
var country_name:String?
var country_code:String?
init(add: NSDictionary)
{
country_name = add["country"] as? String
country_code = add["code"] as? String
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
tableCountryView.dataSource = self
tableCountryView.delegate = self
get_data_from_url(json_url)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return TableData.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
let data = TableData[indexPath.row]
cell.textLabel?.text = data.country_name! + " - " + data.country_code!
return cell
}
func get_data_from_url(url:String)
{
let url:NSURL = NSURL(string: url)!
let session = NSURLSession.sharedSession()
let request = NSMutableURLRequest(URL: url)
request.HTTPMethod = "GET"
request.cachePolicy = NSURLRequestCachePolicy.ReloadIgnoringCacheData
let task = session.dataTaskWithRequest(request) {
(
let data, let response, let error) in
guard let _:NSData = data, let _:NSURLResponse = response where error == nil else {
print("error")
return
}
dispatch_async(dispatch_get_main_queue(), {
self.extract_json(data!)
return
})
}
task.resume()
}
func extract_json(jsonData:NSData)
{
let json: AnyObject?
do {
json = try NSJSONSerialization.JSONObjectWithData(jsonData, options: [])
} catch {
json = nil
return
}
if let list = json as? NSArray
{
for (var i = 0; i < list.count ; i++ )
{
if let data_block = list[i] as? NSDictionary
{
TableData.append(datastruct(add: data_block))
}
}
do_table_refresh()
}
}
func do_table_refresh()
{
dispatch_async(dispatch_get_main_queue(), {
self.tableCountryView.reloadData()
return
})
}
}
This code is working true for the first JSON syntax but if I want to read sub-array like the syntax at the following JSON file , how I can edit that in my previous code.
JSON:
{
"Countries": [4]
0: {
"countryname": "Egypt"
"code": "20"
}-
1: {
"countryname": "India"
"code": "91"
}-
2: {
"countryname": "United States"
"code": "1"
}-
3: {
"countryname": "Turkey"
"code": "90"
}-
}
Also I have the button at my storyboard and I want to show this table view of country when clicking on this button and then choose one country and close this table and show the result on the button , I know this easy but I started to learn IOS from 2 weeks only, I hope if you can give me advice in these cases.