Scroll immediately to row in table before view shows

Question

A view with a table gets pushed onto the screen and I want it to scroll to a certain row in the table before the screen actually displays. I use this code within the final viewcontroller.

NSIndexPath *scrollToPath = [NSIndexPath indexPathForRow:5 inSection:0]; 
[theTable scrollToRowAtIndexPath:scrollToPath atScrollPosition:UITableViewScrollPositionTop animated:NO];

When I put it in viewDiDAppear method, then it briefly flashes from the intial position of the table (at the top) to the row I want. I don't want it to show the initial position. If I put it in viewDidLoad or viewWillAppear then it crashes with a NSRangeException, presumably because the table isn't set up yet.

How would I get it to scroll without showing the initial position?

Answer 1

If I put it in viewDidLoad or viewWillAppear then it crashes with a NSRangeException, presumably because the table isn't set up yet.

Why isn't the table set up yet? In which method are you setting it up?

Answer 2

I just finished wrestling with this. Mine was adding a search bar to the top of the list, initially tucked under the top... ala some of the core apps. I was actually going to ask this same question!

I fear to offer this up, as it seems those who offer things up get pounded down.. but... I was surprised that there was not an easy solution... so I ended up doing this:

I use ABTableViewCell (you can google it) for custom drawn cells (nice and fast!), and when I get called to DRAW the second row (you could do this in your customly drawn cells without ABTableViewCell), I set it there, with a single fire semaphore:

if ( self.mOnlyOnce == NO && theRow > 1 ) {
    self.mOnlyOnce = YES;
    [self.mParentTable scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:0 inSection:1] atScrollPosition:UITableViewScrollPositionTop animated:NO];
}

(choose your proper row/section, as suits you... if they were in the same section, you'd probably be setting row to something other than 0)

If you hate my solution (as I can't comment yet), please do me the favor of just leaving it at zero & letting a better solution come to the top.

Oh, also, there is an entry about hiding your search at the top... but mine was already done as a custom cell... here is that link.

enjoy

Answer 3

Thanks to Shaggy and Dying Cactus for pointing me in the right direction. The answer is to load the table and scroll in viewWillAppear:

-(void)viewWillAppear:(BOOL)animated
{
    [theTable reloadData];
    NSIndexPath *scrollToPath = [NSIndexPath indexPathForRow:5 inSection:0]; 
    [theTable scrollToRowAtIndexPath:scrollToPath atScrollPosition:UITableViewScrollPositionTop animated:NO];   
}

Answer 4

This thread helped me solve a similar problem. Thanks all :)