Scroll UITableView so that the header isn't visible

Question

I've got a UITableView with a UISearchBar as the tableViews.tableHeaderView. Just like the new Mail.app, Notes.app, etc. in 3.0. I want to hide the SearchBar until the user drags it in his sight.

My attempt only works when there're a couple of items in the tableView, so that the tableView actually wants to scroll. I call this in loadView:

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self._tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];

Nevertheless it seems that Apple handles such a serachbar differently. After draging out the searchbar it doesn't seem to be bounded to the tablecells anymore (in Notes.app, not in Mail.app).

But perhaps Apple has a distinct method for that new 3.0 behaviour, and I just can't find it?

Answer 1

Maybe you can try it this way...

[self.tableView setContentOffset:CGPointMake(0,40)];

Answer 2

Worked for me too. I used the following:

[self.tableView setContentOffset:CGPointMake(0, self.searchDisplayController.searchBar.frame.size.height) animated:NO];

to query the height of the search bar.

Answer 3

This one gets you the exact same behavior as iPod.app:

- (void)viewWillAppear:(BOOL)animated
{
 [super viewWillAppear:animated];

 CGFloat searchBarHeight = CGRectGetHeight([[[self searchDisplayController] searchBar] frame]);
 if ([[self tableView] contentOffset].y < searchBarHeight)
  [[self tableView] setContentOffset:CGPointMake(0, searchBarHeight)];
}

Answer 4

This works for me.

- (void)viewDidLoad {
    [super viewDidLoad];

    self.tableView.bounces = YES;
}

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    [self.tableView setContentOffset:CGPointMake(0, 44)];
}

Answer 5

I had to scroll first to top then setContentOffset to 0, Then searchBar will be visible :

self.tableView.scrollToRowAtIndexPath(NSIndexPath(forRow: 0, inSection: 0), atScrollPosition: UITableViewScrollPosition.Top, animated: false)
self.tableView.setContentOffset(CGPointMake(0, 0), animated: false)

Answer 6

I kind of like doing it this way:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];

    // Hide the table view header by default.
    NSIndexPath *index = [NSIndexPath indexPathForRow:0 inSection:0];
    [self.tableView scrollToRowAtIndexPath:index atScrollPosition:UITableViewScrollPositionTop animated:NO];
}

This way you don't really need to worry about how tall your header is. It just works!