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  • Get Value from textChange Without Using any Delegate Method of UITextField in Swift

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    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.
        }
    }
    
    

     

    Get Value from textChange Without Using any Delegate Method of UITextField in Swift

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