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Editorial Team
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Asked: 2026-05-28T08:06:49+00:00

I have started putting some validation in the text fields. There must be an

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I have started putting some validation in the text fields. There must be an easier way than writing every possible check.

There are two things I’d like to do:

  1. I need the user to type in a year. I have set the keyboard to numeric. how can I limit the length to max of 4, check to see if it is in the past < than current year, etc…
  2. Just want to limit the length of another entry to 7 characters
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1 Answer

  1. Editorial Team

    you would use the UITextField delegate
    set the delegate on the uitextfield and then implement these methods into your class

    - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

    then check whenever that updates if the string will be less than or equal to 4 characters and do any other sort of checks as to what will be changed nd return YES if you want to allow it and NO if not

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