iOS 9.2
Is there a trick to using UITableView -reloadData? I can't get it to do
anything.
My view controller has a UITableView instance (VC is both UITableView delegate
and dataSource), and I populate it with cells from my data source via the
delegate callback method -tableView:cellForRowAtIndexPath:. That works fine.
Now, when the data source has additional data, it calls -reloadData to
rebuild/redisplay the table view, but this has no effect. The delegate callback
method -tableView:cellForRowAtIndexPath: doesn't get invoked, and the contents
of the table view don't change. In the debugger, I've verified that the
UITableView property is valid:
_sbsTableView is: <UITableView: 0x14b29000; frame = (20 74; 528 188);
clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray:
0x146f22a0>; layer = <CALayer: 0x14645640>; contentOffset: {0, 0}; contentSize:
{528, 616}>
The reload doesn't reload the table, causing an index out of range exception
downstream when trying to access a row that -reload should have added.
// Reload the table's data
[_sbsTableView reloadData]; // no visible change onscreen
// Reposition the table view to display the new entry
NSIndexPath *indxPath = [NSIndexPath indexPathForRow:user_no
inSection:sec_no];
[_sbsTableView selectRowAtIndexPath:indxPath // <- exception
animated:YES
scrollPosition:UITableViewScrollPositionMiddle];
[_sbsTableView scrollToRowAtIndexPath:indxPath
atScrollPosition:UITableViewScrollPositionMiddle
animated:YES];
The docs say:
1. "The table view’s delegate or data source calls this method when it wants
the table view to completely reload its data."
2. "Call this method to reload all the data that is used to construct the
table, including cells, section headers and footers, index arrays, and so on."
Wouldn't that necessitate the invocation of the delegate callback method
-tableView:cellForRowAtIndexPath:? FWIW, the next time the app is run, the
additional data does appear in the table.
There must be something obvious I'm overlooking...
-Carl
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