How to use search bar controller with Core data generated tabel view - Swift?

Question

I am new to iOS development and am in my second app with Swift. There are 2 views in my app. First View is an Array with fruits, that is randomly generate on a button click(by the user). Output of First View: [Apple, Orange, Banana, Pears]

Now the user clicks the generate button again. The View gives a random selection of fruits: [Pomegranate, Pears, Watermelon, Muskmelon]

The user clicks the generate button again and new list of array are generated.

All these generated arrays are stored in the Second View which is a Table view controller. The saving of array of fruits in second view controller is done by Core data.

Now, I have added a Search bar and Search display Controller in this second view, so that any fruit; say Pears; when entered by the user is filtered in the table and only those rows are displayed/filtered in the same table view.

I am not sure how do I read/search/filter data from Core data and make the Search Bar Controller work. I have tried many methods and read various articles on Core data and UI Search Bar Controller, but nothing helped. Please advice how do I proceed.

So Far my second view controller:

import UIKit
import CoreData
import Foundation

class HistoryTableViewController: UITableViewController {

     var totalGeneratedFruits: Int = 0
        let context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
        let managedObjectContext: NSManagedObjectContext? = (UIApplication.sharedApplication().delegate as? AppDelegate)?.managedObjectContext
        var arrayFiltered = [Fruits]() // SHOULD THE SEARCH ARRAY BE LIKE THIS??? 

        @IBOutlet weak var searchBar: UISearchBar! // UISearch Bar Controller
        @IBOutlet var tblHistory: UITableView! = nil // The Table view controller

        override func viewDidLoad()
        {
            super.viewDidLoad()
            var request = NSFetchRequest(entityName: "Fruits")
            request.returnsObjectsAsFaults = false
            totalGeneratedFruits = context.countForFetchRequest(request, error: nil )
           //for search
            ????????HOW to Overload search filtered data???????
        }
        // MARK: - Table view data source
        override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
                return 1
        }
        override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { 
                return totalGeneratedFruits
        }
        override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: (NSIndexPath!)) -> UITableViewCell
        {
            let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell
            let request = NSFetchRequest(entityName: "Fruits")
            request.returnsObjectsAsFaults = false
            //Get the contents of Generated fruits and put into cell to build History Table view rows
            var results : NSArray
            do {
                results = try context.executeFetchRequest(request)
                let thisFruit = results[indexPath.row] as! Fruits
                cell.textLabel?.text = thisFruit.fruit 
                cell.detailTextLabel?.text = thisFruit.date // As Subtitle

               //For search criteria
              ????????HOW TO SEARCH and FILTER data???????
                }
            }catch {}
            return cell
        } 
        // Override to support conditional editing of the table view.
        override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
            return true
        }
    }

??????????? WHICH DELEGATE FUNCTION SHOULD BE USED?? and how do I implement it?

My Core data class looks like: Core Data class name is Fruits.swift

import UIKit
import CoreData

@objc(Fruits)

class Fruits: NSManagedObject {
    @NSManaged var date: String
    @NSManaged var fruit: String
}

In the first view the array is saved in Core data by the following code:

let newFruit = Fruits(entity: ent!, insertIntoManagedObjectContext: context)
newFruit.fruit = displayLabel.text!
newFruit.date = dateFormatter.stringFromDate(NSDate())
        do {
            try context.save()
        }catch{}

After a couple of more research I added the below method for the search functionality to filter data. But the value in PREDICATE is always nil. What am I doing wrong?

func searchBar(searchBar: UISearchBar, textDidChange searchText: String) {
        if !searchText.isEmpty {
            fetchedResultsController = nil 
            var predicate: NSPredicate = NSPredicate()
            predicate = NSPredicate(format: "fruit contains [cd] %@", searchBar.text!)
            let sortDescriptor = NSSortDescriptor(key: "fruit", ascending: true)
            fetchRequest.sortDescriptors = [sortDescriptor]
            fetchedResultsController?.fetchRequest.predicate = predicate
            print(fetchedResultsController?.fetchRequest.predicate) 
 // HERE THE fetchedResultsController?.fetchRequest.predicate is ALWAYS NIL
            do {
                try fetchedResultsController?.performFetch()
            }catch{}
            fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: context, sectionNameKeyPath: nil, cacheName: nil)
            fetchedResultsController?.delegate = self
            tableView.reloadData() 
        }
    }