The way to invalidate data in the tableView when you free it would be
to reloadData. So, get rid of whatever you're getting rid of, build
your new, truncated list of items, and then call [tableView
reloadData] so you put only the data you've kept around in the table.
Also, if you're worried about a race condition, you could set a flag
before you begin freeing things, so that if any data is requested
while you're in the process of freeing but you haven't yet called
reloadData, you will do the right thing.
Luke
On Jan 14, 2009, at 12:57 PM, Mohan Parthasarathy wrote:
Yes, that's what i meant. Just to confirm.. It is safe to assume
that numberOfSectionsInTableView will be first function called ? I
am thinking of this sequence..
1) The code receives low memory warning and frees up the data that
the tableView is currently displaying
2) CellForRowAtIndexPath is called now for Nth Row.
(2) in my code would reference the data that has been freed in step
(1). Is it possible to invalidate the tableView Data also while
freeing memory at step (1) ?
thanks
mohan
On Wed, Jan 14, 2009 at 12:32 PM, Luke the Hiesterman <luket...@apple.com
> wrote:
I assume you meant numberOfSectionsInTableView:....anyway, a good
strategy might be to just go ahead and return 0 initially, and then
whenever you have successfully pulled your data from the network, do
[tableView reloadData] and then you can return the appropriate
numbers at that time, since they will be ready.
Luke
On Jan 14, 2009, at 12:24 PM, Mohan Parthasarathy wrote:
Hi,
I am using a UITableViewController and the data for the table view is
generated dynamically (fetched from the network). The data is normally
fetched based on some search. But when the Controller is loaded and
i don't
have the data ready, i want to return something back sane and later
reload
the data when it becomes ready. What is the best way to do this ?
-numberOfSectionsinRow : Is it safe to assume that this function is
called
always *first* before constructing the table ? At least i want to be
able to
initiate the fetch (if it is not already done before) here.
-As i can't return 0 for numberOfSectionsInRow, i still have to
return 1
there and in numberOfRowsInSection, return zero till the data becomes
available
The problem is that i need to initiate the fetch somewhere during
the table
construction and i don't want to put hooks into all of the tableView
delegate methods. As the data for the tableview is dynamic, i need
to tell
the framework not to call the other delegate methods till i return
something
valid in numberOfSectionsInRow/numberOfRowsInSection. Is this a safe
assumption ?
thanks
mohan
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