[HowTo] Search Bar Fully Programmatic Approach

Search Bar without using any 3rd party library and fully programmatic approach

Code

//  ViewController.swift

import UIKit

class ViewController: UIViewController {
    
    //MARK: - Properties
    
    private let searchBar = UISearchBar()
    
    //MARK: - Life Cycle

    override func viewDidLoad() {
        super.viewDidLoad()
        configureUI()
    }
    
    //MARk: - Selectors
    
    @objc func handleShowSearhBar() {
        search(shouldShow: true)
        searchBar.becomeFirstResponder()
    }
    
    //MARk: - Helpers
    
    private func configureUI() {
        view.backgroundColor = .white
        
        navigationController?.navigationBar.prefersLargeTitles = true
        navigationController?.navigationBar.tintColor = .black
        navigationItem.title = "Search Bar"
        
        showSearchBarButton(shouldShow: true)
        
        searchBar.sizeToFit()
        searchBar.delegate = self
    }
    
    private func search(shouldShow: Bool) {
        showSearchBarButton(shouldShow: !shouldShow)
        searchBar.showsCancelButton = shouldShow
        navigationItem.titleView = shouldShow ? searchBar : nil
    }
    
    private func showSearchBarButton(shouldShow: Bool) {
        if shouldShow {
            navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .search, target: self, action: #selector(handleShowSearhBar))
        } else {
            navigationItem.rightBarButtonItem = nil
        }
    }
}

//MARK: - UISearchBarDelegate

extension ViewController: UISearchBarDelegate {
    
    func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
        print("Search bar did begin editing")
    }
    
    func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {
        print("Search bar did end editing")
    }
    
    func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
        search(shouldShow: false)
    }
    
    func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
        print("Search text is \(searchText)")
    }
}

References

Search Bar Github Link (opens new window)