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Editorial Team
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Asked: 2026-05-30T11:30:30+00:00

I need to react in a way specific to my iPhone app when the

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I need to react in a way specific to my iPhone app when the user is typing inside some UITextView field.

Three examples :

  1. I want to dismiss the keyboard if the user types in: ‘E’.
  2. I want to jump to a new input line if the user types in: ‘nN’.
  3. I want to ignore if the user types in: ‘A’ or ‘b’.

I am sure there must be a quite simple way to do what I want. But after browsing for a while on the net, I do not find a clear answer.

What is the way to go?

Thanks for any tip.

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1 Answer

  1. Editorial Team

    If you are using a UITextField, give the text field a delegate (implementing the UITextFieldDelegate protocol), and in the delegate, implement textField:shouldChangeCharactersInRange:replacementString:. Examine the replacement string and take action based on whether it contains the characters you’re looking for.

    If you are using a UITextView, give the text view a delegate (implementing the UITextViewDelegate protocol), and in the delegate, implement textView:shouldChangeTextInRange:replacementText:.

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