DebounceOperator.swift

import UIKit
import RxSwift
import RxCocoa
import Alamofire
import RxSwiftExt

class ViewController: UIViewController {
    let disposeBag = DisposeBag()
    @IBOutlet weak var textField: UITextField!

    
    override func viewDidLoad() {
        super.viewDidLoad()
        textFieldSample()
    }
    
    private func textFieldSample() {
        textField.rx.text
            .debounce(0.4, scheduler: MainScheduler.instance)  //Here we wait 0.3 seconds to be sure that user doesn't want to tap multiple times
            .subscribe(onNext: { [weak self] text in
                self?.search(withQuery: text);
            }).addDisposableTo(disposeBag)
    }
   }