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- (void)viewDidAppear:(BOOL)animated {
  [super viewDidAppear:animated];
  [[NSNotificationCenter defaultCenter]
      addObserver:self
         selector:@selector(keyboardWillShow:)
             name:UIKeyboardWillShowNotification
           object:nil];
  [[NSNotificationCenter defaultCenter]
      addObserver:self
         selector:@selector(keyboardWillHide:)
             name:UIKeyboardWillHideNotification
           object:nil];
}

- (void)viewDidDisappear:(BOOL)animated {
  [super viewDidDisappear:animated];
  [[NSNotificationCenter defaultCenter]
      removeObserver:self
                name:UIKeyboardWillShowNotification
              object:nil];
  [[NSNotificationCenter defaultCenter]
      removeObserver:self
                name:UIKeyboardWillHideNotification
              object:nil];
}

- (void)adjustViewByKeyboardState:(BOOL)isShow
                     keyboardInfo:(NSDictionary *)info {
  if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
    NSValue *keyboardBoundsValue =
        [info objectForKey:UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardBounds;
    [keyboardBoundsValue getValue:&keyboardBounds];
    CGFloat keyboardHeight = keyboardBounds.size.height;

    CGFloat offset;

    if (isShow) {
      offset = keyboardHeight - 120;
    } else {
      offset = 0;
    }

    CGRect listFrame = CGRectMake(0, -offset, self.view.frame.size.width,
                                  self.view.frame.size.height);

    [UIView beginAnimations:@"anim" context:NULL];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:0.2];

    self.view.frame = listFrame;

    [UIView commitAnimations];
  }
}

- (void)keyboardWillShow:(NSNotification *)notification {
  NSDictionary *info = [notification userInfo];
  [self adjustViewByKeyboardState:YES keyboardInfo:info];
}

- (void)keyboardWillHide:(NSNotification *)notification {
  NSDictionary *info = [notification userInfo];
  [self adjustViewByKeyboardState:NO keyboardInfo:info];
}