Search bar not working in Swift 4 IOS App - ios

Question

I have implemented a search bar to search for users, but nothing shows up in the table view when I search for something. I have attached a picture of my view controller below.
View Controller:
This view controller shows a list of all the users and the search bar is supposed to help the user find a username.
import UIKit
class FindFriendsViewController: UIViewController {
var users = [User]()
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var searchBar: UISearchBar!
var searchItem = [String]()
var searching = false
override func viewDidLoad() {
super.viewDidLoad()
tableView.tableFooterView = UIView()
tableView.rowHeight = 71
let tap = UITapGestureRecognizer(target: self.view, action: #selector(UIView.endEditing(_:)))
tap.cancelsTouchesInView = false
self.view.addGestureRecognizer(tap)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
UserService.usersExcludingCurrentUser { [unowned self] (users) in
self.users = users
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}
extension FindFriendsViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if searching {
return searchItem.count
} else {
return users.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "FindFriendsCell") as! FindFriendsCell
// let user = users[indexPath.row]
var usernamesArr = [String]()
for user in users {
usernamesArr.append(user.username)
}
if searching {
cell.textLabel?.text = searchItem[indexPath.row]
} else {
cell.textLabel?.text = usernamesArr[indexPath.row]
cell.delegate = self
configure(cell: cell, atIndexPath: indexPath)
}
return cell
}
func configure(cell: FindFriendsCell, atIndexPath indexPath: IndexPath) {
let user = users[indexPath.row]
cell.usernameLabel.text = user.username
cell.followButton.isSelected = user.isFollowed
}
}
extension FindFriendsViewController: FindFriendsCellDelegate {
func didTapFollowButton(_ followButton: UIButton, on cell: FindFriendsCell) {
guard let indexPath = tableView.indexPath(for: cell) else { return }
followButton.isUserInteractionEnabled = false
let followee = users[indexPath.row]
FollowService.setIsFollowing(!followee.isFollowed, fromCurrentUserTo: followee) { (success) in
defer {
followButton.isUserInteractionEnabled = true
}
guard success else { return }
followee.isFollowed = !followee.isFollowed
self.tableView.reloadRows(at: [indexPath], with: .none)
}
}
}
extension FindFriendsViewController: UISearchBarDelegate {
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
var usernamesArr = [String]()
for user in users {
usernamesArr.append(user.username)
}
searchItem = usernamesArr.filter({$0.lowercased().prefix(searchText.count) == searchText.lowercased()})
searching = true
tableView.reloadData()
}
}

Answer 1

I am thinking about different problems that may occur in your code. You need to set the search bar delegate and the search Result Updater:
yourSearchController.searchBar.delegate = self
yourSearchController.searchResultsUpdater = self
If you don't have a controller, but directly the search bar:
yourSearchBar.delegate = self
yourSearchBar.searchResultsUpdater = self
And this as your delegate:
extension MasterViewController: UISearchBarDelegate {
// MARK: - UISearchBar Delegate
func searchBar(_ searchBar: UISearchBar, selectedScopeButtonIndexDidChange selectedScope: Int) {
filterContentForSearchText(searchBar.text!, scope: searchBar.scopeButtonTitles![selectedScope])
}
}
extension MasterViewController: UISearchResultsUpdating {
// MARK: - UISearchResultsUpdating Delegate
func updateSearchResults(for searchController: UISearchController) {
let searchBar = searchController.searchBar
let scope = searchBar.scopeButtonTitles![searchBar.selectedScopeButtonIndex]
filterContentForSearchText(searchController.searchBar.text!, scope: scope)
}
Or maybe you are missing something like updating. Check the data's path excluding the problem one for time. First, you enter the text inside the search bar, after that check in the code where the text goes and what happens. Did you update the table view when search bar is in end editing status?
If it doesn't help you, check this wonderful tutorial which I followed times ago: Search Bar iOS

Answer 2

try for search username using this method to filter
searchItem = users.filter({ (objUser) -> Bool in
return (objUser.username?.lowercased() ?? "").starts(with: searchBar.text!.trim().lowercased())
})
Hope this will help you.