ios – Add house within the textfield after each 4 character, utilizing Swift

First, be sure that your view controller conforms to the UITextFieldDelegate protocol:

import UIKit
class ViewController: UIViewController, UITextFieldDelegate {

// Your different code

override func viewDidLoad() {
    tremendous.viewDidLoad()
    
    // Assuming you may have a UITextField named textField
    textField.delegate = self
}

// Your different code
}

Then, implement the textField(_:shouldChangeCharactersIn:replacementString:) methodology so as to add areas each 4 characters:
swift

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {

    @IBOutlet weak var textField: UITextField!
    
    override func viewDidLoad() {
        tremendous.viewDidLoad()
        
        textField.delegate = self
    }
    
    func textField(_ textField: UITextField, shouldChangeCharactersIn vary: NSRange, replacementString string: String) -> Bool {
        // Take away any areas from the present textual content
        let textWithoutSpaces = textField.textual content?.replacingOccurrences(of: " ", with: "") ?? ""
        
        // Mix the brand new string with the prevailing textual content with out areas
        let newText = (textWithoutSpaces as NSString).replacingCharacters(in: vary, with: string)
        
        // Insert areas each 4 characters
        let formattedText = newText.chunkFormatted(withChunkSize: 4, separator: " ")
        
        // Replace the textual content discipline's textual content
        textField.textual content = formattedText
        
        // Because you're updating the textual content manually, return false to stop default conduct
        return false
    }
}

extension String {
    func chunkFormatted(withChunkSize chunkSize: Int, separator: String) -> String {
        return stride(from: 0, to: depend, by: chunkSize).map {
            let begin = index(startIndex, offsetBy: $0)
            let finish = index(begin, offsetBy: chunkSize, limitedBy: endIndex) ?? endIndex
            return String(self[start..<end])
        }.joined(separator: separator)
    }
}