Move a view when scrolling in UITableView

Question

I have a UIView with a UITableView below it:

Answer 1

Someone asked for the code for my solution so I am posting it here as an answer. The credit for the idea should still go to NobodyNada.

In my UITableViewController I implement this delegate method:

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    [[NSNotificationCenter defaultCenter] postNotificationName:@"TableViewScrolled" object:nil userInfo:scrollUserInfo];
}

scrollUserInfo is a NSDictionary where I put my UITableView to pass it with the notification (I do this in viewDidLoad so I only have to do it once):

scrollUserInfo = [NSDictionary dictionaryWithObject:self.tableView forKey:@"scrollView"];

Now, in the view controller that has the view I want to move off screen while scrolling I do this in viewDidLoad:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleScroll:) name:@"TableViewScrolled" object:nil];

And finally I have the method:

- (void)handleScroll:(NSNotification *)notification {
    UIScrollView *scrollView = [notification.userInfo valueForKey:@"scrollView"];
    CGFloat currentOffset = scrollView.contentOffset.y;
    CGFloat height = scrollView.frame.size.height;
    CGFloat distanceFromBottom = scrollView.contentSize.height - currentOffset;

    if (previousOffset < currentOffset && distanceFromBottom > height) {
        if (currentOffset > viewHeight)
            currentOffset = viewHeight;
        self.topVerticalConstraint.constant += previousOffset - currentOffset;
        previousOffset = currentOffset;
    }
    else {
        if (previousOffset > currentOffset) {
            if (currentOffset < 0)
                currentOffset = 0;
            self.topVerticalConstraint.constant += previousOffset - currentOffset;
            previousOffset = currentOffset;
        }
    }
}

previousOffset is an instance variable CGFloat previousOffset;. topVerticalConstraint is a NSLayoutConstraint that is set as a IBOutlet. It goes from the top of the view to the top of its superview and the initial value is 0.

It's not perfect. For instance, if the user scrolls very aggressively up the movement of the view can get a bit jerky. The issue is worse for large views; if the view is small enough there is no problem.