Limit number of characters for a UIAlertViewStylePlainTextInput

Question

I'm creating a text input uialertview using the method below.

[dialog setAlertViewStyle:UIAlertViewStylePlainTextInput];

How can I limit the number of characters the user is able to input?

user `textfield delegate` and add this [Link](http://stackoverflow.com/questions/433337/set-the-maximum-character-length-of-a-uitextfield) — ChintaN -Maddy- Ramani, May 14 '14 at 11:26

score 3 · Answer 1 · edited May 23 '17 at 11:44

Try this code

First add UITextFieldDelegate

UIAlertView *dialog = [[UIAlertView alloc]init];// Setup your alert 
[dialog setAlertViewStyle:UIAlertViewStylePlainTextInput];
[dialog textFieldAtIndex:0].placeholder = @"";//add this if you need
[dialog textFieldAtIndex:0].delegate = self;

and add textfield delegate as per Check this Answer

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    NSUInteger newLength = [textField.text length] + [string length] - range.length;
    return (newLength > 25) ? NO : YES;
}

Maybe it will help you.

Your answer is correct. Please always provide the supported link on the top of the answer. — Himanshu Joshi, May 14 '14 at 11:32

score 0 · Answer 2 · edited May 14 '14 at 16:57

If you have instance of your alertView just do the following

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if([self.alertView textFieldAtIndex:0])
    {
      NSUInteger newLength = [textField.text length] + [string length] - range.length;
      return (newLength > 25) ? NO : YES;
    }
    return YES; // suppress warning about control reaching end of non-void function
}

Limit number of characters for a UIAlertViewStylePlainTextInput

2 Answers2