Search Bar controller in TableView - ios

Question

Hello I am trying to implement a SearchBarController but If I type something in the search bar data doesn't comes up according to the letters typed. Here is my code
class CountriesTableViewController: UITableViewController, UISearchResultsUpdating {
var dict = NSDictionary()
var filterTableData = NSDictionary()
var resultSearchController = UISearchController()
override func viewDidLoad() {
super.viewDidLoad()
getCountriesNamesFromServer()
self.resultSearchController = ({
let controller = UISearchController(searchResultsController: nil)
controller.searchResultsUpdater = self
controller.dimsBackgroundDuringPresentation = false
controller.searchBar.sizeToFit()
self.tableView.tableHeaderView = controller.searchBar
return controller
})()
self.tableView.reloadData()
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if(self.resultSearchController.active){
return self.filterTableData.count-1
}else {
return dict.count-1
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! CountriesTableViewCell
if(self.resultSearchController.active){
// (cell.contentView.viewWithTag(1) as! UILabel).text = filterTableData[indexPath.row]
cell.countryNameLabel.text = (((filterTableData["\(indexPath.item)"] as?NSDictionary)!["Countries"] as?NSDictionary)!["name"] as?NSString)! as String
return cell
}else{
cell.countryNameLabel.text = (((dict["\(indexPath.item)"] as?NSDictionary)!["Countries"] as?NSDictionary)!["name"] as?NSString)! as String
return cell
}
}
func updateSearchResultsForSearchController(searchController: UISearchController) {
let keys: NSArray = dict.allKeys
let filteredKeys: [String] = keys.filteredArrayUsingPredicate(NSPredicate(format: "SELF CONTAINS[c] %#", searchController.searchBar.text!)) as! [String]
filterTableData = dict.dictionaryWithValuesForKeys(filteredKeys)
}
I think Problem is in this function updateSearchResultsForSearchController because first I think I have to remove the object from Nsdictionary. I know in Array we do this
filterTableData.removeAll(keepCapacity: false)
and I think for NSDictionary I have to use NSMUtableDictionary But I don't know if that is the problem. If it is the problem still don't know how can I remove objects from NSMutableDictionary and in short to make this search functionality workable.
Note: Data is Populating successfully in tableView.. just the search functionality is not working