UISearchBar - Search with RxSwift Example

SampleRxSearchViewController.swift

final class SampleRxSearchViewController: UIViewController {
    
    // MARK: - Properties
    @IBOutlet fileprivate weak var tableView: UITableView!
    @IBOutlet fileprivate weak var searchBar: UISearchBar!
    
    fileprivate var tweets = [Tweet]()
    fileprivate var filteredTweets = [Tweet]()
    
    // MARK - Lifecycle
    fileprivate let disposeBag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        configureSearch()
    }
    
    fileprivate func configureSearch() {
      
      searchBar.rx.text
            .orEmpty
            .throttle(1.0, scheduler: MainScheduler.instance)
            .distinctUntilChanged()
            .subscribe { [unowned self] (query) in
                
                self.filteredTweets = self.tweets.search(query: query)
                self.tableView.reloadData()
                
            }.disposed(by: disposeBag)
    }
}

extension String {
    func search(_ term: String) -> Bool {
        let lowercasedSelf = self.lowercased()
        let lowercasedTerm = term.lowercased()
        return lowercasedSelf.localizedCaseInsensitiveContains(lowercasedTerm)
    }
}

extension Array where Element: Tweet {
    func search(query: Event<String>) -> [Element] {
        return self.filter({
            guard let text = $0.text, let queryElement = query.element else { return false }
            return text.search(queryElement)
        })
    }   
}