textfield inputs range in interface builder

Question

hi friends .. i have a multiple textfields in my nib file. i want to decide input range in my one textfield 6-16 digits.and don't wanna to change some other textfield input.for that i was made a method called tflimit as below.

-(IBAction)tflimit:(id)sender
{      
    if([textfields1.text length]>=15 )
    {
         [textfields1 resignFirstResponder]; 
    }   
}

for this method i can input only 16 digits input. how can i decide the range(6-16) of input in the textfield,without changing other codes. please help me.

Answer 1

You can filter user input in textField:shouldChangeCharactersInRange:replacementString: method in text field delegate:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
    if (textField == textfields1){// Apply logic only to required field
        NSString* newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
        return [newString length] < 16 && [newString length] > 5;
    }
    return YES;
}

Note that to work correctly this method require textfield to be pre-populated with text at least 5 characters long.

Answer 2

thanks Vladimir for ur reply..but i have to input from keyboard without populating any prior input.and for implementing this method i have to declare the in .h file.and for implementing this method my all fields are not responded.how to do perform my task.please help me .