- (void)dealloc

{

    [[NSNotificationCenter defaultCenter] removeObserver:self];

}

- (void)registerNotification {

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(showKeyboard:) name:UIKeyboardWillShowNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self  selector:@selector(hideKeyboard:) name:UIKeyboardWillHideNotification object:nil];

}

#pragma mark - keyboard

- (void)showKeyboard:(NSNotification *)noti {

    NSDictionary *info=[noti userInfo];

    NSTimeInterval duration = [info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    UIViewAnimationOptions options = [info[UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue] << ;

    CGRect keyboardRect = [info[UIKeyboardFrameEndUserInfoKey] CGRectValue];

    CGFloat keyboardHeight = MIN(CGRectGetWidth(keyboardRect), CGRectGetHeight(keyboardRect));

    [UIView animateWithDuration:duration delay: options:options animations:^{

        CGFloat compareH = self.tableView.contentSize.height -(self.view.height -  -  - keyboardHeight);

        if (compareH >  ) {

            if (compareH < keyboardHeight) {

                self.tableView.transform = CGAffineTransformMakeTranslation(, -compareH);

            } else {

                self.tableView.transform = CGAffineTransformMakeTranslation(, -keyboardHeight);

            }

        }

        self.bottomView.transform = CGAffineTransformMakeTranslation(, -keyboardHeight);

    } completion:nil];

}

- (void)hideKeyboard:(NSNotification *)noti {

    NSDictionary *info=[noti userInfo];

    NSTimeInterval duration = [info[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

    UIViewAnimationOptions options = [info[UIKeyboardAnimationCurveUserInfoKey] unsignedIntegerValue] << ;

    [UIView animateWithDuration:duration delay: options:options animations:^{

        self.tableView.transform = CGAffineTransformIdentity;

        self.bottomView.transform = CGAffineTransformIdentity;

    } completion:nil];

}