Re: DataSource modified while TableView is displaying data
Re: DataSource modified while TableView is displaying data
- Subject: Re: DataSource modified while TableView is displaying data
- From: Peter Hudson <email@hidden>
- Date: Thu, 26 Apr 2012 11:33:43 +0100
I've had a similar problem to this in the past. I never bottomed it out.
The workaround I used was to check validity of the row index for every data call and, if the index was invalid, return a
suitable easily visible debug string ( "bad index") and post a timed update 0.25 second later.
I never saw my debug string and the code ran happily.
Peter
On 26 Apr 2012, at 11:23, Jean Suisse <email@hidden> wrote:
> Dear Peter,
>
> Thank you for your reply. Here is the requested code (see below).
> After more investigations, I would like to take back a previous statement, that the tableview was perfectly aware that the number of rows in the DS was changed. This is due to my inexperience in stepping through the code across multiple threads.
>
> Here are the facts :
>
> - Only the controller removes rows from the datasource. Either in response to user actions (canceling tasks) or as a result of a Task completed notification from a running task.
> - Each change in the dataSource is immediately followed by a reloadData message sent to the TableView.
> - Sometimes, randomly, the TableView requests a row index that is out of bounds by one index (e.g. row #5 when the dataSource contains only 5 elements).
>
> I am thinking that a redraw occurs in-between the removal of one element of the table and the reloadData message.
> For now, I did a quick fix for this issue by adding a category with "safeObjectAtIndex"…. But one way to be certain would be to ensure that the two messages (removal + reloadData) are sent without any thread/process switching occurring…
>
> The code for numberOfRowsInTableView : (experimentList is an instance of NSMutableAray)
>
> - (NSInteger)numberOfRowsInTableView:(NSTableView*)tableView
> {
> return self.experimentList ? [self.experimentList count] : 0;
> }
>
> Jean
>
>
> On 26 avr. 2012, at 11:45, Peter Hudson wrote:
>
>>
>> Can you post your code for numberOfRowsInTableView:
>>
>> Peter
>
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