更新聊天应用程序的tableview视图

Question

我正在使用firebase在我的应用程序中实现实时聊天，如果显示键盘并且用户连续发送了10条消息，他的消息最终会隐藏在我的键盘后面或者从tableview视图下面出去（如果键盘没有显示）。我认为这与调整视图以适应tableview中的行数有关。最终，每次发送消息或接收最新消息时，我都需要将最新的单元格放在文本字段的正上方（无论是否显示键盘）。有小费吗？我看了github上的firechat，他们似乎没有任何代码：https://github.com/firebase/firechat-ios/blob/master/Firechat/ViewController.m

- (void)viewWillAppear:(BOOL)animated
{
    [[NSNotificationCenter defaultCenter]
    addObserver:self selector:@selector(keyboardWillShow:)
    name:UIKeyboardWillShowNotification object:nil];

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

- (void)keyboardWillShow:(NSNotification*)notification
{
    [self moveView:[notification userInfo] up:YES];
}

- (void)keyboardWillHide:(NSNotification*)notification
{
    [self moveView:[notification userInfo] up:NO];
}

- (void)moveView:(NSDictionary*)userInfo up:(BOOL)up
{
    CGRect keyboardEndFrame;
    [[userInfo objectForKey:UIKeyboardFrameEndUserInfoKey]
     getValue:&keyboardEndFrame];

    UIViewAnimationCurve animationCurve;
    [[userInfo objectForKey:UIKeyboardAnimationCurveUserInfoKey]
     getValue:&animationCurve];

    NSTimeInterval animationDuration;
    [[userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey]
     getValue:&animationDuration];

    // Get the correct keyboard size to we slide the right amount.
    [UIView beginAnimations:nil context:nil];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:animationDuration];
    [UIView setAnimationCurve:animationCurve];

    CGRect keyboardFrame = [self.view convertRect:keyboardEndFrame toView:nil];
    int y = keyboardFrame.size.height * (up ? -1 : 1);
    self.view.frame = CGRectOffset(self.view.frame, 0, y);

    [UIView commitAnimations];
}