Validation for allow only numeric value in IPhone

- (void)textFieldDidEndEditing:(UITextField *)textField

{

    NSString *phoneRegex = @"^([0-9]+)?(\\.([0-9]{1,2})?)?$";

    NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", phoneRegex];

   

    if([phoneTest evaluateWithObject:textField.text]==NO)

    {

        UIAlertView *alertView = [[UIAlertView alloc]

                                  initWithTitle:@"Validation" message:@"Only Number allow."

                                  delegate:self cancelButtonTitle:@"Yes" otherButtonTitles:nil, nil];

       

        [alertView show];

        [textField becomeFirstResponder];

    }

}