NRGridView won't show data from my core data database - objective-c

Question

I am building a app for a local football club. I want to show all players names and pictures in a grid. Therefore I am using the NRGridview. But it won't load up with my data. I have an NSArray with all players information. Here you see the method which generates this array.
- (NSArray *)getTeam
{
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:#"Team"];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"sortOrder" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[request setSortDescriptors:sortDescriptors];
NSError *error = nil;
NSArray *mutableFetchResults = [self.genkDatabase.managedObjectContext executeFetchRequest:request error:&error];
NSLog(#"first error log %#", [error localizedDescription]);
if (mutableFetchResults == nil) {
NSLog(#"second error log %#", [error localizedDescription]);
}else if ([mutableFetchResults count] == 0){
NSLog(#"geen resultaten voor team");
}else{
NSLog(#"team names: %#",[mutableFetchResults valueForKey:#"name"]);
return mutableFetchResults;
}
return mutableFetchResults;
}
And this is what I do in the tableview.
- (NRGridViewCell*)gridView:(NRGridView *)gridView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *MyCellIdentifier = #"MyCellIdentifier";
NRGridViewCell* cell = [gridView dequeueReusableCellWithIdentifier:MyCellIdentifier];
if(cell == nil){
cell = [[NRGridViewCell alloc] initWithReuseIdentifier:MyCellIdentifier];
[[cell textLabel] setFont:[UIFont boldSystemFontOfSize:11.]];
[[cell detailedTextLabel] setFont:[UIFont systemFontOfSize:11.]];
}
NSLog(#"players array %#",players);
for (int i = 0; i <= [players count]; i++) {
// NSData *imgData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[[players objectAtIndex:i]valueForKey:#"image"]]];
// UIImage *image = [[UIImage alloc]initWithData:imgData];
//cell.imageView.image = image;
cell.textLabel.text = [[players objectAtIndex:i]valueForKey:#"name"];
cell.detailedTextLabel.text = [[players objectAtIndex:i]valueForKey:#"position"];
return cell;
}
return cell;
}
The NSLog gives always (null). My question is now, where should I put the code "NSArray *players = [self getTeam] . so that my tableview will fill up with data?
EDIT
It did give me back the right amount of sections, and numberOfRowsInsection. For numbersOfRowsIn section I created 4 methods. 1 method whichs gets all off the goalkeepers, 1 for the defenders, 1 for the wingers, and 1 for the attackers. Then In my tableview method I did the following.
- (NSInteger)gridView:(NRGridView *)gridView numberOfItemsInSection:(NSInteger)section
{
if(section == 0){
return [[self getDoelmannen]count];
}else if (section == 1){
return [[self getVerdedigers]count];
}else if (section == 2){
return [[self getMiddenvelders]count];
}else{
return [[self getAanvallers]count];
}
return [[self getAanvallers]count];
}
This works. But still have the problem for my cell self.
EDIT2
Okay I think my problem is with filling my players Array up. I do the following in my viewDidLoad
-(void)viewDidLoad{
_players = [self getTeam];
NSLog(#"players array: %#",_players);
}
Which gives the following log.
2012-10-17 12:11:22.099 RacingGenk[63122:c07] nil
2012-10-17 12:11:22.099 RacingGenk[63122:c07] players array: (null)
Here is my code for getTeam
- (NSArray *)getTeam
{
NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:#"Team"];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"sortOrder" ascending:YES];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[request setSortDescriptors:sortDescriptors];
NSError *error = nil;
NSArray *mutableFetchResults = [self.genkDatabase.managedObjectContext executeFetchRequest:request error:&error];
if (mutableFetchResults == nil) {
NSLog(#"nil");
}else if ([mutableFetchResults count] == 0){
NSLog(#"geen resultaten voor team");
}else{
NSLog(#"team names: %#",[mutableFetchResults valueForKey:#"name"]);
return mutableFetchResults;
}
return mutableFetchResults;
}

Answer 1

It looks like players isn't getting initialized. You can put your [self getTeam] call in the viewDidLoad method and make players a property.
If NRGridView is anything like UITableView, there are probably other methods that you need to overload.
For example, UITableView has tableView:numberOrRowsInSection:. Failure to return > 0 value from this method results in nothing being shown. Or numberOfSectionsInTableView:, which returns the number of sections and so on.
Check the documentation for the control you're using.
Update:
Since your executeFetchRequest:error: is failing, you should check if there's an error message instead of just printing out (nil):
NSLog(#"%#", [error localizedDescription]);