UiSearchController to UiCollectionView in Swift - swift

Question

I want to add Search bar programmatically. I want it to look like in Settings App (appear when scrolling down and disappear when scrolling up).
But Search Bar doesn't appear.
Outline:
ViewController:
import UIKit
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UISearchControllerDelegate, UISearchBarDelegate, UISearchResultsUpdating {
var filtered:[String] = []
var searchActive : Bool = false
let searchController = UISearchController(searchResultsController: nil)
#IBOutlet weak var collectionView: UICollectionView!
var items = ["Apple", "Orange", "Apple", "Orange", "Apple", "Orange", "Apple", "Orange", "Apple", "Orange", "Apple", "Orange"]
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
self.searchController.searchResultsUpdater = self
self.searchController.delegate = self
self.searchController.searchBar.delegate = self
self.searchController.hidesNavigationBarDuringPresentation = false
self.searchController.dimsBackgroundDuringPresentation = true
self.searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search..."
searchController.searchBar.sizeToFit()
searchController.searchBar.becomeFirstResponder()
self.navigationItem.titleView = searchController.searchBar
self.definesPresentationContext = true
self.searchController.searchBar.placeholder = "Search for Items"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if searchActive {
return filtered.count
}
else
{
return items.count
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
cell.contentView.layer.cornerRadius = 7.0
cell.contentView.layer.borderWidth = 1.0
cell.contentView.layer.borderColor = UIColor.clear.cgColor
cell.contentView.layer.masksToBounds = false
cell.layer.cornerRadius = 7.0
return cell
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchActive = false
self.dismiss(animated: true, completion: nil)
}
func updateSearchResults(for searchController: UISearchController)
{
let searchString = searchController.searchBar.text
filtered = items.filter({ (item) -> Bool in
let countryText: NSString = item as NSString
return (countryText.range(of: searchString!, options: NSString.CompareOptions.caseInsensitive).location) != NSNotFound
})
collectionView.reloadData()
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
searchActive = true
collectionView.reloadData()
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
searchActive = false
collectionView.reloadData()
}
func searchBarBookmarkButtonClicked(_ searchBar: UISearchBar) {
if !searchActive {
searchActive = true
collectionView.reloadData()
}
searchController.searchBar.resignFirstResponder()
}
}
App is working, showing items, but there is no search bar while scrolling.
Maybe this is because I am using UiCollectionView instead of UiTableView and I have to add some additional code?
What am I missing?
Video, how it looks: https://drive.google.com/file/d/1P0carjjgiForBnK_UmiuBWWk5A7BqSWB/view?usp=sharing

Answer 1

Are you running in iOS 11? Did you pull down the collection view? the search bar only appears when pull down. The only difference that I see with one that I have working is this, the navigationItem searchcontroller:
self.navigationItem.searchcontroller = searchcontroller

Answer 2

Your code is not working because you don’t have a navigation controller. At least it doesn’t show in the code or in the video. If you don’t, you need to embed the viewController in a navigationController.