How to Check When a Uitextfield Changes

How do I check when a UITextField changes?

SWIFT

Swift 4.2

textfield.addTarget(self, action: #selector(ViewController.textFieldDidChange(_:)), for: .editingChanged)

and

@objc func textFieldDidChange(_ textField: UITextField) {

}

SWIFT 3 & swift 4.1

textField.addTarget(self, action: #selector(ViewController.textFieldDidChange(_:)), for: .editingChanged)

and

func textFieldDidChange(_ textField: UITextField) {

}

SWIFT 2.2

textField.addTarget(self, action: #selector(ViewController.textFieldDidChange(_:)), forControlEvents: UIControlEvents.EditingChanged)

and

func textFieldDidChange(textField: UITextField) {
    //your code
}

OBJECTIVE-C

[textField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];

and textFieldDidChange method is

-(void)textFieldDidChange :(UITextField *) textField{
    //your code
}

UITextField text change event

From proper way to do uitextfield text change call back:

I catch the characters sent to a UITextField control something like this:

// Add a "textFieldDidChange" notification method to the text field control.

In Objective-C:

[textField addTarget:self 
              action:@selector(textFieldDidChange:) 
    forControlEvents:UIControlEventEditingChanged];

In Swift:

textField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)

Then in the textFieldDidChange method you can examine the contents of the textField, and reload your table view as needed.

You could use that and put calculateAndUpdateTextFields as your selector.

How to detect live changes on TextField in SwiftUI?

You can create a binding with a custom closure, like this:

struct ContentView: View {
    @State var location: String = ""

    var body: some View {
        let binding = Binding<String>(get: {
            self.location
        }, set: {
            self.location = $0
            // do whatever you want here
        })

        return VStack {
            Text("Current location: \(location)")
            TextField("Search Location", text: binding)
        }

    }
}

Check for changes in UITextField

What you have to do is to attach an IBAction to your UITextField Sent Events Editing Changed:

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var strLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
    @IBAction func editingChanged(sender: UITextField) {
        strLabel.text = sender.text
    }
}

UITextField Value Changed Event?

Objective-C

[myTextField addTarget:self 
                action:@selector(textFieldDidChange:) 
      forControlEvents:UIControlEventEditingChanged];

Swift 4

myTextField.addTarget(self, action: #selector(textFieldDidChange(sender:)), for: .editingChanged)

@objc func textFieldDidChange(sender: UITextField) {...}

---

Related Topics