CODEWITHSUNDEEP
iosswiftuitextfield
F. Suyuti
F. Suyuti

Reputation: 327

SWIFT: Extension for UITextField that doesn't accept whitespace as input

I know shouldChangeTextInRange method on UITextFieldDelegate can filter input on UITextField, it's ok if i only need to filter one UITextField. Now my problem is i have lot of UITextField that need to filter whitespace. And i don't want to implement shouldChangeTextInRange on every UIViewController that have UITextField in it. Is there anyway to make extension of the UITextField or other?

Upvotes: 3

Views: 1197

Answers (2)

unknowncoder
unknowncoder

Reputation: 132

Actually this is quite simple, just subclass UITextField, add delegate to it, and implement the shouldChangeTextInRange there.

class CustomTextField: UITextField, UITextFieldDelegate {
  override func awakeFromNib() {
    super.awakeFromNib()

    delegate = self
  }

  func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
    if (string.rangeOfCharacterFromSet(.whitespaceCharacterSet()) != nil) {
      return false
    } else {
      return true
    }
  }
}

Upvotes: 1

Santosh
Santosh

Reputation: 2914

Swift allows to extend the protocols as well. You can make an extension UITextFieldDelegate and implement your custom code in that method. But there are some limitations, check this answer, it will help you swift 2.0 - UITextFieldDelegate protocol extension not working

Upvotes: 0

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