Stop user from entering only spaces in textfield?

Question

In my app I have a textfield in which users have to enter a string from 1-25 characters. The problem I'm having is stopping them from only entering spaces. I want them to be able to use spaces but only if they have other characters (abc, 1-9, etc.). How can I stop them from only entering spaces?

possible duplicate of [How to know if a UITextField in iOS has blank spaces](http://stackoverflow.com/questions/8238691/how-to-know-if-a-uitextfield-in-ios-has-blank-spaces) — jprofitt, Feb 04 '14 at 04:30

Akshay Nalawade · Answer 1 · 2014-02-04T05:42:22.337

2

In your view controller set delegate of UITextField to self. Then implement following method.

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

  if([[textField.text stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] length] == 0){
      return NO;
   }

  return YES;
}

edited Feb 04 '14 at 05:42

answered Feb 04 '14 at 05:33

Akshay Nalawade

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score 1 · Accepted Answer · edited May 23 '17 at 12:21

1

Sounds like this question might help.

Just trim the whitespace off the string and then check to see if it is the empty string.

edited May 23 '17 at 12:21

Community

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answered Feb 04 '14 at 04:30

therealrootuser

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score 0 · Answer 3 · answered Feb 04 '14 at 04:30

0

Perform a whitespace "trim" on their input and check to see if the result matches an empty string.

answered Feb 04 '14 at 04:30

Nick Coad

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Stop user from entering only spaces in textfield?

3 Answers3