I implemented UISearchController in my app to search for users to follow and unfollow. I am using swift and Parse as a backend. The problem is, whenever I want to type something and then delete it, it keeps the retrieved results and does not delete them. When there is no result, the table view shows "No result" with the retrieved results because there are not deleted!! I can't figure out what is the problem. Any help?
Here is the code,
UISearchController delegate and methods,
// To search
var userSearchController: UISearchController!
var resultsController = UITableViewController()
var searchActive: Bool = false
// To follow and unfollow users
var userIds = [""]
var isFollowing = ["":false]
// MARK: - Lifecycle
override func viewDidLoad() {
super.viewDidLoad()
// tableview delegate and datasource
self.resultsController.tableView.dataSource = self
self.resultsController.tableView.delegate = self
self.resultsController.loadViewIfNeeded()
configureSearchController()
}
func configureSearchController(){
self.userSearchController = UISearchController(searchResultsController: nil)
// Set the search controller to the header of the table
self.tableView.tableHeaderView = self.userSearchController.searchBar
// This is used for dynamic search results updating while the user types
// Requires UISearchResultsUpdating delegate
self.userSearchController.searchResultsUpdater = self
self.userSearchController.dimsBackgroundDuringPresentation = false
self.definesPresentationContext = true
// Configure the search controller's search bar
self.userSearchController.searchBar.placeholder = "Search for a parent"
self.userSearchController.searchBar.sizeToFit()
self.userSearchController.searchBar.delegate = self
}
// MARK: - Search Bar Delegate Methods
func searchBarSearchButtonClicked(searchBar: UISearchBar) {
let searchString: String = searchBar.text!.lowercaseString
if searchActive == false {
searchActive = true
// Force search if user pushes button
if (searchString != "") {
loadSearchUsers(searchString)
}
self.resultsController.tableView.reloadData()
}
}
func searchBarTextDidBeginEditing(searchBar: UISearchBar) {
searchActive = true
}
func searchBarTextDidEndEditing(searchBar: UISearchBar) {
searchActive = false
}
func searchBar(searchBar: UISearchBar, textDidChange searchText: String){
if (searchBar.text == ""){
searchActive = false
}
else {
searchActive = true
let searchString: String = searchBar.text!.lowercaseString
if (searchString != ""){
loadSearchUsers(searchString)}
}
}
func searchBarCancelButtonClicked(searchBar: UISearchBar) {
searchActive = false
searchBar.text = ""
self.searchUsers.removeAll(keepCapacity: false)
self.resultsController.tableView.reloadData()
}
func updateSearchResultsForSearchController(searchController: UISearchController) {
if let searchString: String = searchController.searchBar.text!.lowercaseString {
if (searchString != "" && !self.searchActive) {
loadSearchUsers(searchString)
}
}
}
Here is the numberOfSectionsInTableView
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
var numOfSection: NSInteger = 0
if userIds.count > 0 {
//self.resultsController.tableView.reloadData()
self.tableView.backgroundView = nil
self.tableView.separatorStyle = UITableViewCellSeparatorStyle.SingleLine
numOfSection = 1
} else {
let noDataLabel: UILabel = UILabel(frame: CGRectMake(0, 0, self.tableView.bounds.size.width, self.tableView.bounds.size.height))
noDataLabel.text = "No result."
noDataLabel.textColor = UIColor(red: 22.0/255.0, green: 106.0/255.0, blue: 180.0/255.0, alpha: 1.0)
noDataLabel.textAlignment = NSTextAlignment.Center
self.tableView.backgroundView = noDataLabel
self.tableView.separatorStyle = UITableViewCellSeparatorStyle.None
}
return numOfSection
}
Let me know if you need more information. Thank you so much.
Table data wont get deleted just because you made changes in search text. You have to clear the data-set first and then set the search result into data-set and then reload, You already do this in searchBarCancelButtonClicked method.
self.searchUsers.removeAll()
self.searchUsers.appendContentsOf(results)
self.resultsController.tableView.reloadData()