keyboard 에서 enter 키 누르면 키보드 숨기기

UITextField 의 경우

#pragma mark - UITextFieldDelegate

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

{

    if ([string isEqualToString:@"\n"]) {

        [self.view endEditing:YES];

    }

    return YES;

}

UITextView 의 경우

#pragma mark - UITextViewDelegate

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{

    if ([text isEqualToString:@"\n"]) {

        [self.view endEditing:YES];

    }

    return YES;

}