Delay table view loading or load array before viewDidLoad? - ios

Question

I'm using a webservice to fill an array of items, which then are used to fill cells of my table view.
Now i'm having an issue with the table view itself. When I check the " numberofrows" method, the array isn't loaded yet. For some reason it loads "right after" that (according to my nslogs & breakpoints), even though i've put every loading method as early as i could in that controller.
Now what i don't know is :
is there a way to delay the table view creation so i'm sure my array is loaded?
is there a way to load my array earlier? It's currently my first line in the viewDidLoad. (calling another class, which then calls the webservice and returns an array, but by then, the table view is already loaded and empty).
What i've tried : Putting a tableview reloadData. But it simply doesn't work. For some reason the compiler reads the line but doesn't load anything new, even though at that point the array is full.
Am i missing something?
(My tableview works just fine if I put hardcoded objects in my array)
I can edit and add some code that you guys would request, but since this looks like a school problem here, maybe i just forgot something.
Guys, i'm all ears !
Edit :
My different methods ; i've removed unecessary code for clearer reading.
The compiler NEVER goes in the cellForRow because numberOfRows is returning a zero number.
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = #"CustomCellTableViewCell";
CustomCellTableViewCell *cell = [self.tbUpcomingEvents dequeueReusableCellWithIdentifier:cellIdentifier forIndexPath:indexPath];
cell.lbTitle = [_eventList objectAtIndex:indexPath.row];
return cell;
}
number of rows ; the nslog returns zero.
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSLog(#"numOfRows : %i", [_eventList count]);
return [_eventList count];
}
my webservice method, this is the method calle from the "webservice class" to load the data.
Here, the NSLog shows a full array.
- (void)loadData:(NSMutableArray*)arrayEvent
{
//arrayEvent is full from the internet data. eventList is also full on the NSLog.
_eventList = arrayEvent;
NSLog(#"LoadData : %i", [_eventList count]);
[self.tbUpcomingEvents reloadData];
}
my viewdidLoad method
- (void)viewDidLoad
{
[super viewDidLoad];
//Calling my UseCaseController to load the data from the internet.
UCC *sharedUCC = [UCC sharedUCC];
[sharedUCC getUserEventsInDbDis:self :_user];
}

Answer 1

As you said you are using webservices. So it is executing your code in the block which means it is running in separate thread. Now as per apple documentation UI updates should happen in main thread. So for table creation you need to include the same in below GCD code:-
dispatch_async(dispatch_get_main_queue,()^{
// write your code for table creation here
});