HELP!.UITableView not reloading data on reloadData() or calling cellForRowAtIndexPath

[whoDatNinja]

I am having a serious issue with UITableView reloadData method. I have a UIViewController class, WiGiMainViewController that has a UITableView and NSMuttableArray in it. I am currently issuing network calls in the AppDelegate, and posting notifications to the WiGiMainViewController once the data has been downloaded. In my selector method for the notification, reloadWigiList, I am passing an NSArray containing the the recently downloaded items. I then initialize the WiGiMainViewController's NSMuttableArray with the passed in array and proceed to call reloadData() on my UITableView object. I can see from nslog statements that the numberOfRowsInSection is fired on reload but not the cellForRowAtIndexPath, therefore causing the UI NOT to reload the UITableView with the newly downloaded items. I have verified that the reloadData method is being called on the main thread and that the datasource delegate are set in IB and programatically in the viewDidLoad method of WiGiMainViewController. Any ideas why my UITableView, wigiLists isn't reloading the data, in particular, not calling the cellForRowAtIndexPath method?

EDIT: When the view first loads numberOfRowsInSection is 0. But this should be correct, as at this time the itemlist count is equal to 0, and won't be filled until the items are downloaded. However afterwards, when the data is downloaded the itemList count is equal 6 and upon calling reloadData, the numberOfRowsInSection returns a count of 6. I have noticed that if i put 1 or a number greater than 0 for numberofRows I can see the first item shown on the tableview after I scroll.

EDIT: I am PRETTY sure the delegate and datasource are set correctly in both IB and viewDidLoad(). When reloadData is issued, numberOfRowsInSection is called, but cellForRowAtIndexPath isn't.

@interface WiGiMainViewController : UIViewController<FBRequestDelegate,UITableViewDelegate, UITableViewDataSource> {

     //setup UI
     UITableView *wigiLists;
     
     WiGiAppDelegate *myAppDelegate;
     NSMutableArray *itemsList;

}
@property (nonatomic, retain) WiGiAppDelegate *myAppDelegate;
@property (nonatomic, retain) IBOutlet UITableView *wigiLists;
@property (nonatomic, retain) NSMutableArray *itemsList;

-(void) reloadWigiList: (NSNotification*) notification;
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView;
-(NSInteger) tableView: (UITableView*) tableView numberOfRowsInSection:(NSInteger) section;
-(UITableViewCell *) tableView: (UITableView*)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath;

@end


@implementation WiGiMainViewController

@synthesize headerLabel = _headerLabel, userNameLabel = _userNameLabel, facebookPicture = _facebookPicture,
myAppDelegate, wigiLists, itemsList;

- (void)viewDidLoad {
     NSLog(@"In viewDidLoad");
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reloadWigiList:) name:@"wigiItemUpdate" object:nil];

     
     // get appdelicate
     self.myAppDelegate = (WiGiAppDelegate*) [[UIApplication sharedApplication] delegate];     
     self.itemsList = [[NSMutableArray alloc] init];
     //setup tableview
      self.wigiLists = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
          self.wigiLists.delegate = self;
     self.wigiLists.dataSource = self;
     //set up view
     [self.headerLabel setText:self.myAppDelegate.HEADER_TEXT];
     //check if user is logged in
     if (self.myAppDelegate.isLoggedIn) {
          //user is logged in
          NSLog(@"HERE");
          //get facebook information to populate view
          [self retrieveFacebookInfoForUser];
          //[self.myAppDelegate retrieveWigiItems];
     }else {
          //user is not logged in
          NSLog(@"user not logged in");
          //show login modal
     }
     //[self.wigiLists reloadData];
     [super viewDidLoad];
}

-(void) reloadWigiList: (NSNotification *) notification {
     if ([NSThread isMainThread]) {
          NSLog(@"main thread");
     }else{
          NSLog(@"MEHTOD NOT CALLED ON MAIN THREAD!");
     }
     NSLog(@"notification recieved:%@", notification.userInfo);
     
     NSLog(@"in reloadwigilists:%@", wigiLists );
     NSLog(@"list size:%@", self.itemsList);
     NSLog(@"delegate:%@",self.wigiLists.delegate);
     NSLog(@"datasource:%@",self.wigiLists.dataSource);
     //populate previously empty itemsList
     [self.itemsList setArray:notification.userInfo];
     NSLog(@"list size:%@", self.itemsList);
     [self.wigiLists reloadData];
     
}

/////////////////////////////////////
// UITableViewDelegate protocols
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView {
     //NSLog(@"numberofsections: %@", [self.itemsList count]);
     return 1;
}

-(NSInteger) tableView: (UITableView *)tableView numberOfRowsInSection:(NSInteger) section {
     NSLog(@"7t87giuiu%@",self.itemsList);
     NSLog(@"numberofrows: %i", [self.itemsList count]);


          return [self.itemsList count];

     //return 6;

}

[L14M333]

try using

[self.tableView reloadData]

[whoDatNinja]

Originally Posted by L14M333

try using

[self.tableView reloadData]

Thanks for the response. My tableView is named wigiLists and I have done:

 [self.wigiLists reloadData]

but that doesn't help. I don't think I can do self.tableView as I did not declare a variable named tableView.

[baja_yu]

Are the DataSource and Delegate for that tableview set to the class that implements the cellForRowAtIndexPath and other methods?

[L14M333]

Originally Posted by whoDatNinja

Thanks for the response. My tableView is named wigiLists and I have done:

 [self.wigiLists reloadData]

but that doesn't help. I don't think I can do self.tableView as I did not declare a variable named tableView.

I know, but if you delegated it, It should respond to it... I think i had the same issue once and it fixed it...

I may be wrong though because im fairly new... worth a shot tho




Liam

[whoDatNinja]

Originally Posted by baja_yu

Are the DataSource and Delegate for that tableview set to the class that implements the cellForRowAtIndexPath and other methods?

Yes, I print them out in the nslog and they are both set to the WiGiMainViewController class.

[baja_yu]

Wait a second. Where are the implementations of those methods? All I see is the declarations in the header file, which by the way you don't need to do, that's what conforming to a protocol is for. But I, for example, don't see the cellForRowAtIndexPath implemented anywhere.

[whoDatNinja]

Originally Posted by baja_yu

Wait a second. Where are the implementations of those methods? All I see is the declarations in the header file, which by the way you don't need to do, that's what conforming to a protocol is for. But I, for example, don't see the cellForRowAtIndexPath implemented anywhere.

I ommited it for brevity. Here it is though, its just being called when the app first starts but then not again.

-(UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

	NSLog(@"trying to return cell");
	static NSString *CellIdentifier = @"Cell";
	UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
	if (cell==nil) {
		cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
	}
	
	//grab the item
	if ([self.itemsList count] >0) {
	NSDictionary *currentItem =(NSDictionary *) [self.itemsList objectAtIndex:indexPath.row];
	NSLog(@"%i",indexPath.row);
	//setup the cell
	cell.text = [currentItem objectForKey:@"item_comments"];
	NSURL *url = [NSURL URLWithString:[currentItem objectForKey:@"item_image_url"]];
	NSData *img = [[NSData alloc] initWithContentsOfURL:url];
	cell.imageView.image = [UIImage imageWithData:img]; 
		[img release];
	}

	
	return cell;
	
}

[whoDatNinja]

Wow! after 3 days of banging my head against this problem, it was something ridiculously simple. In my ViewDidLoad method of WiGiMainViewController, i was initializing my tableview:

self.wigiLists = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];

Because I had linked the tableView I created in IB to my instance wigiLists, alloc'ing and initializing in the ViewDidLoad overwrote my link to the tableView created in IB and currently being displayed. Getting rid of this line fixed everything.