Mike,
The -reloadData is being issued on the main thread:
<NSThread: 0x15622080>{number = 1, name = main}
-Carl
> On Feb 12, 2016, at 4:19 PM, Michael Swan <[email protected]> wrote:
>
> Right before you call reload data log the current thread [NSThread
> currentThread];
> If it says anything other than main that's the issue. It happens all the time
> since it's easy to forget that whatever callback tells you about the added
> data ends up coming in on the background.
>
> Hope that helps,
> Mike Swan
> OS X & iOS Developer
> TheMikeSwan.com
>
>> On Feb 12, 2016, at 5:53 PM, [email protected] wrote:
>>
>> Message: 1
>> Date: Fri, 12 Feb 2016 12:37:53 -0800
>> From: Carl Hoefs <[email protected]>
>> To: "[email protected] dev" <[email protected]>
>> Subject: UITableView -reloadData woes
>> Message-ID:
>> <[email protected]>
>> Content-Type: text/plain; charset=utf-8
>>
>> 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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