Adding a SearchBar on TableView - ios

Question

I want to add a search bar in my tableview which is populated with data from Core Data. Below is parts of code from my TableViewController. How do I begin implementing the searchbar function after placing one on the tableview?
let managedObjectContext =
(UIApplication.sharedApplication().delegate
as! AppDelegate).managedObjectContext
var fetchedLastName = [String]()
var fetchedFirstName = [String]()
var fetchedImage = [UIImage]()
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:",name:"load", object: nil)
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: managedObjectContext)
let request = NSFetchRequest()
request.entity = entityDescription
do{
let objects = try managedObjectContext.executeFetchRequest(request)
let results = objects
if results.count > 0 {
for var i = 0; i < results.count; i += 1{
let match = results[i] as! NSManagedObject
fetchedLastName.append((match.valueForKey("lastname") as? String)!)
fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
let image = match.valueForKey("image") as! NSData
fetchedImage.append(UIImage(data: image)!)
}
} else {
}
}
catch{}
}
func reloadData(notification: NSNotification){
fetchedLastName.removeAll()
fetchedFirstName.removeAll()
fetchedImage.removeAll()
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: managedObjectContext)
let request = NSFetchRequest()
request.entity = entityDescription
do{
let objects = try managedObjectContext.executeFetchRequest(request)
let results = objects
if results.count > 0 {
for var i = 0; i < results.count; i += 1{
let match = results[i] as! NSManagedObject
fetchedLastName.append((match.valueForKey("lastname") as? String)!)
fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
let image = match.valueForKey("image") as! NSData
fetchedImage.append(UIImage(data: image)!)
}
} else {
}
}
catch{}
self.tableView.reloadData()
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("TEACH", forIndexPath: indexPath) as! TEACHTableViewCell
let row = indexPath.row
print(fetchedFirstName)
cell.facultyName.text = fetchedLastName[row] + ", " + fetchedFirstName[row]
cell.facultyImage.image = fetchedImage[row]
return cell
}
}

Answer 1

Try this code all tested:
//
// TEACHTableViewController.swift
// TEACH
//
// Created by ICST340.N1 on 9/29/15.
// Copyright © 2015 IyoTugs. All rights reserved.
//
import UIKit
import CoreData
class TEACHTableViewController: UITableViewController, UISearchBarDelegate, UISearchControllerDelegate, UISearchResultsUpdating {
var searchController = UISearchController()
var filteredTableData = [[String: AnyObject?]]()
var tableData = [[String: AnyObject?]]()
let managedObjectContext =
(UIApplication.sharedApplication().delegate
as! AppDelegate).managedObjectContext
var fetchedLastName = [String]()
var fetchedFirstName = [String]()
var fetchedImage = [UIImage]()
override func viewDidLoad() {
super.viewDidLoad()
//setup search controller
searchController = UISearchController(searchResultsController: nil)
searchController.searchResultsUpdater = self
searchController.dimsBackgroundDuringPresentation = false
searchController.delegate = self
tableView.tableHeaderView = searchController.searchBar
definesPresentationContext = true
searchController.searchBar.sizeToFit()
NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:",name:"load", object: nil)
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: managedObjectContext)
let request = NSFetchRequest()
request.entity = entityDescription
do{
let objects = try managedObjectContext.executeFetchRequest(request)
let results = objects
if results.count > 0 {
for var i = 0; i < results.count; i += 1{
let match = results[i] as! NSManagedObject
fetchedLastName.append((match.valueForKey("lastname") as? String)!)
fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
//added this is convert the image
let image = match.valueForKey("image") as! NSData
let realImage = UIImage(data: image)!
fetchedImage.append(UIImage(data: image)!)
tableData.append(["firstName" : match.valueForKey("firstname"), "lastName" : match.valueForKey("firstname"), "image" : realImage])
}
} else {
}
}
catch{}
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
func reloadData(notification: NSNotification){
fetchedLastName.removeAll()
fetchedFirstName.removeAll()
//Added this to remove all images
fetchedImage.removeAll()
tableData.removeAll()
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: managedObjectContext)
let request = NSFetchRequest()
request.entity = entityDescription
do{
let objects = try managedObjectContext.executeFetchRequest(request)
let results = objects
if results.count > 0 {
for var i = 0; i < results.count; i += 1{
let match = results[i] as! NSManagedObject
fetchedLastName.append((match.valueForKey("lastname") as? String)!)
fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
//added this is convert the image
let image = match.valueForKey("image") as! NSData
let realImage = UIImage(data: image)!
fetchedImage.append(UIImage(data: image)!)
tableData.append(["firstName" : match.valueForKey("firstname"), "lastName" : match.valueForKey("firstname"), "image" : realImage])
}
} else {
}
}
catch{}
self.tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
if searchController.active {
return filteredTableData.count
} else {
return fetchedLastName.count
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("TEACH", forIndexPath: indexPath) as! TEACHTableViewCell
if searchController.active {
let row = indexPath.row
print(fetchedFirstName)
let firstName = filteredTableData[row]["firstName"] as! String
let lastName = filteredTableData[row]["lastName"] as! String
let image = filteredTableData[row]["image"] as! UIImage
cell.facultyName.text = lastName + ", " + firstName
cell.facultyImage.image = image
} else {
let row = indexPath.row
print(fetchedFirstName)
cell.facultyName.text = fetchedLastName[row] + ", " + fetchedFirstName[row]
cell.facultyImage.image = fetchedImage[row]
}
return cell
}
func filterContentForSearchText(searchText: String) {
for singleTableData in tableData {
let firstname = singleTableData["firstName"] as! String
let lastname = singleTableData["lastName"] as! String
let image = singleTableData["image"] as! UIImage
print(firstname)
print(lastname)
if searchText != "" {
if (firstname.rangeOfString(searchText) != nil) {
filteredTableData.append(["firstName" : firstname, "lastName" : lastname, "image" : image])
} else if (lastname.rangeOfString(searchText) != nil) {
filteredTableData.append(["firstName" : firstname, "lastName" : lastname, "image" : image])
}
} else {
filteredTableData.append(["firstName" : firstname, "lastName" : lastname, "image" : image])
}
}
}
func updateSearchResultsForSearchController(searchController: UISearchController) {
filteredTableData.removeAll()
filterContentForSearchText(searchController.searchBar.text!)
tableView.reloadData()
}
}