In this tutorial we will learn to get value from textChange without using any delegate method of UITextField in swift.

let's see how:

1- We can achieve this using React, i.e. RxSwift

2- No need for textField delegate methods for this.

#Basic setup for project1- Create a new project in Xcode
3- Now we have to install the pods in our project for that jump to project directory.

4- Run the followings commands
    a) pod init
    b) open podfile
    c)  Your empty podfile will look like this

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

target 'YourProjectName' do
  # Comment the next line if you're not using Swift and don't want to use dynamic frameworks
  use_frameworks!

  # Pods for YourProjectName

end

Now add these two lines below user_frameworks!
pod 'RxSwift'
pod 'RxCocoa'

now  your podfile will look like this

# Uncomment the next line to define a global platform for your project
# platform :ios, '9.0'

target 'YourProjectName' do
  # Comment the next line if you're not using Swift and don't want to use dynamic frameworks
  use_frameworks!
    pod 'RxSwift'
    pod 'RxCocoa'
  # Pods for YourProjectName
end

d) now run pod install

5- Close your current project and open yourProject.xcworkspace and now we are ready to write code and setup UI.

6- In the main.storyboard add a UITextField and set the autolayout for that according to your need.

7- Also add a UILabel on the UIViewController which will be reprinting the text that we will enter in above textField.

8- Move to viewController.swift file.

import RxSwift
import RxCocoa

    @IBOutlet weak var rxTextField:UITextField! //outlet for textFields
    @IBOutlet weak var rxLabel:UILabel! //outlet for textFields
    let variable = Variable<String>("") //RxSwift String variable
    let disposeBag = DisposeBag()

now on viewDidLoad add these lines   

_ =  rxTextField.rx.text.orEmpty.bind(to:variable).disposed(by:disposeBag)
     variable.asObservable().bind(to: rxLabel.rx.text).disposed(by: disposeBag)

        or       

variable.asObservable().map({ (stringValue) -> String in
return stringValue.uppercased()//will print text in upper case letter in UILabel
}) .bind(to: rxLabel.rx.text).disposed(by: disposeBag)

9- Run your project.

10- As you start typing in textField text will start appear in label.
Your final snapshot for the controller will look like this

import UIKit
import RxSwift
import RxCocoa


class ViewController: UIViewController {
    
    @IBOutlet weak var rxTextField:UITextField!
    @IBOutlet weak var rxLabel:UILabel!
    let variable = Variable<String>("")
    let disposeBag = DisposeBag()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        _ =  rxTextField.rx.text.orEmpty.bind(to:variable).disposed(by:disposeBag)                            
          // it will bind the value of textField with the variable.
        
        variable.asObservable().map({ (stringValue) -> String in
            return stringValue.uppercased()
        }) .bind(to: rxLabel.rx.text).disposed(by: disposeBag)
        //as value of variable will change it will start observing that values and start printing that values in the label
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}