cannot implement UISearchBar in swift - ios

Question

here is the code of the main file , it is not giving any errors but it's not working :
import UIKit
class mainVC: UIViewController,UITableViewDelegate,UITableViewDataSource , UISearchBarDelegate, UISearchDisplayDelegate {
//this is your tableview
#IBOutlet var table: UITableView!
#IBOutlet var selectedMin: NSString!
#IBOutlet var tasksList: NSArray!
#IBOutlet var searchResults :NSArray!
#IBOutlet var searchBar: UISearchBar!
override func viewDidLoad() {
super.viewDidLoad()
// navigationItem.titleView = UIImageView(image:UIImage(named: "logo3"))
navigationItem.title="مجمع الخدمات الحكومية"
//cell height
self.table.rowHeight = 50
//tableview background
self.table.backgroundView = UIImageView(image: UIImage(named: "space.jpg"))
if let path = NSBundle.mainBundle().pathForResource(selectedMin, ofType: "plist")
{
tasksList = NSArray(contentsOfFile: path)
}
table.separatorColor = UIColor.yellowColor()
}
func filterContentForSearchText(searchText:NSString , scope: String = "All")
{
//var searchText = ""
var resultPredicate : NSPredicate = NSPredicate(format: "name contains[c] %#", searchText)
//var recipes : NSArray = NSArray()
var searchResults = self.tasksList.filteredArrayUsingPredicate(resultPredicate)
}
func searchDisplayController(controller: UISearchDisplayController!, shouldReloadTableForSearchString searchString: String!) -> Bool {
let scopes = self.searchDisplayController!.searchBar.scopeButtonTitles as [String]
let selectedScope = scopes[self.searchDisplayController!.searchBar.selectedScopeButtonIndex] as String
self.filterContentForSearchText(searchString, scope: selectedScope)
return true
}
func searchDisplayController(controller: UISearchDisplayController!, shouldReloadTableForSearchScope searchOption: Int) -> Bool {
let scope = self.searchDisplayController!.searchBar.scopeButtonTitles as [String]
self.filterContentForSearchText(self.searchDisplayController!.searchBar.text, scope: scope[searchOption])
return true
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func viewWillAppear(animated: Bool) {
table.reloadData()
}
func tableView(tableView :UITableView,numberOfRowsInSection section:Int)->Int{
if table == self.searchDisplayController!.searchResultsTableView {
return self.searchResults.count
} else{
return tasksList.count}
}
func tableView(tableView :UITableView,cellForRowAtIndexPath indexpath:NSIndexPath)->UITableViewCell
{
var dict :NSDictionary!
let cell:UITableViewCell=UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "TableView")
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
cell.textLabel?.textColor=UIColor.whiteColor()
//assigning the content of var items to the textlabel of each cell
if table == self.searchDisplayController!.searchResultsTableView {
var dict = searchResults?.objectAtIndex(indexpath.row) as NSDictionary
cell.textLabel?.text = ( dict.objectForKey("NAME") as String)
}
else{
var dict = tasksList?.objectAtIndex(indexpath.row) as NSDictionary
cell.textLabel?.text = ( dict.objectForKey("NAME") as String)
}
if(indexpath.row % 2 == 0){
cell.backgroundColor = UIColor.clearColor()
}else{
//set cell opacity
cell.backgroundColor = UIColor.whiteColor().colorWithAlphaComponent(0.2)
}
return cell
}
func tableView(tableView :UITableView,didSelectRowAtIndexPath indexPath:NSIndexPath){
var dict=tasksList?.objectAtIndex(indexPath.row) as NSDictionary
//create an instance of detailVC
var detail:detailVC=self.storyboard?.instantiateViewControllerWithIdentifier("detailVC")as detailVC
//reference DetailVc s var cellName and assign it to the DetailVC s var items
detail.cellName = dict.objectForKey("NAME") as String
detail.cellDesc = dict.objectForKey("DESC") as String
//programatically push to associated vc "DetailVC"
self.navigationController?.pushViewController(detail, animated: true)
}
}