IPhone+performselector in background

Question

Can anyone help me with performSelectorInBackground? I want to reload table with updated data in performSelectorInBackground.

No UI updates in background. UI changes must be performed on main thread. — Swapnil Luktuke, Mar 20 '12 at 09:12

score 4 · Accepted Answer · edited Apr 29 '15 at 09:53

What you can do is you just get the data in the background thread and you can return back to main thread once you get the data and update the tableview in main thread.

- (UITableViewCell *)tableView:(UITableView *)tableView 
         cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   //All your views cell creations and other stuff
   [self performSelectorInBackground:@selector(loadDataThatToBeFetchedInThread:) 
                          withObject:objectArrayThatNeedToFetchData];
}

- (void) loadDataThatToBeFetchedInThread:(NSArray *)objectThatNeedToFetchData
{
    //Fetch the data here. which takes place in background thread
    [self performSelectorOnMainThread:@selector(updateTableViewWithTheData:) 
                           withObject:responseData 
                        waitUntilDone:YES];
}


- (void) updateTableViewWithTheData:(NSMutableArray *)yourData
{
    //Update Data to tableview here
}

I'm sorry i can only give one +1 :) – Rok Jarc Mar 20 '12 at 09:23 — Rok Jarc, Mar 20 '12 at 09:23
^Thank you very much,I will certainly give it a try – Shantanu Mar 20 '12 at 11:37 — Shantanu, Mar 20 '12 at 11:37

score 0 · Answer 2 · answered Mar 20 '12 at 09:13

0

All the UI functionalities should be done in the main thread. So you have to reload the UITableView in main thread only.

answered Mar 20 '12 at 09:13

Ilanchezhian

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Looks like a great comment! But maybe you have a look at the question! – Alex Cio Apr 29 '15 at 09:54

IPhone+performselector in background

2 Answers2