Question

In my iPad application, I have an UITextField. User should only type numerical. If user types alphabets or alphanumeric text then there should be an alert message saying “Enter only numerical”. What condition should I apply which would find the entered text is numeric, alphabet or alphanumeric?
Any help would be highly appreciated.

Thanks and regards

PC

Answer 1

Implement the UITextFieldDelegate method

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

You can then reject certain characters inside of that method.

Alternatively, set the keyboard style to:
.keyboardType = UIKeyboardTypePhonePad;