Question

I have UITableViewController as the RootViewController. I need to add rows to the table depending on data I get from another thread which I initiate from the RootViewController’s thread. When I retun back from other thread to my RootViewController’s thread I have the updated data, But I can’t update the TableView. I called the [self.tableview reloadData]; method but that doesnt seem to work. I also tried the [self.tableview setNeedsDisplay] call but with no success. How do I update the TableView with new data?

In my RootViewController Class I have:  - (void) reload {  for(int i=0;i<[camDetails count];i++)  {     cCameraInformation *obj = [[cCameraInformation alloc] init];     obj = [camDetails objectAtIndex:i];     NSString *tString = [[NSString alloc] initWithFormat: @'        Remote     %s     %s',[obj->sCameraid UTF8String],[obj->sCameraid UTF8String]];     [tableEntry addObject:tString];  }  [self.tableView reloadData]; } 

Then there is a receive class thread which is continuously receiving data. Its base class is NSObject. So, I used the Application delegate class ( which has an instance of RootViewController class ) to call this reload data method of the RootViewController class in my receive thread.

I am unable to invoke the above method using performSelectorOnMainThread.

Answer 1

hey are you sure you are updating the table view display / reloading tableview on the main thread? i faced the same problem, the data was in there but until user scrolls, tableview was not updated

upon googling i came to know you need to call the reloadData method on the main ui thread

code example below:

- (void) getDataOnNewThread {     // code here to populate your data source     // call refreshTableViewOnMainThread like below:     [self performSelectorOnMainThread:@selector(refreshTableView) withObject:nil waitUntilDone:NO]; }  - (void) refreshTableView {     [tableView reloadData]; }