Question

I need to allow the end user enter only 1-9 digits:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{
        NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];
        if([newString length]>=1)
        {
            NSString *sepStr=[newString substringToIndex:1];
            return !([sepStr length]>1);
        }

        if ([string length] == 0 && range.length > 0){
            textField.text = [textField.text stringByReplacingCharactersInRange:range withString:string];
            return NO;
        }
        NSCharacterSet *nonNumberSet = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789"] invertedSet];
        if ([string stringByTrimmingCharactersInSet:nonNumberSet].length > 0)return YES;
        return NO;
    }

But it’s still possible to enter more than 1 number.
Please help to find an error.

Answer 1

Just add this to your first test :

if ([newString length] > 1)
    return NO;