Disclosure Buttons, icons don't display in FirstLevelController - objective-c

Question

I have written the following code for a FirstLevelController implementation file, but the Disclosure Buttons, icons don't display in the view. Have checked the code, but can't figure out what's wrong.
FirstLevelController.m:
#import "BiDFirstLevelController.h"
#import "BidSecondLevelController.h"
#import "BiDDisclosureButtonController.h"
#implementation BiDFirstLevelController
#synthesize controllers;
- (void)viewDidLoad
{
[super viewDidLoad];
self.title = #"First Level";
NSMutableArray *array = [[NSMutableArray alloc]init];
// Disclosure button
BiDDisclosureButtonController *disclosureButtonController = [[BiDDisclosureButtonController alloc]initWithStyle:UITableViewStylePlain];
disclosureButtonController.title = #"Disclosure Buttons";
disclosureButtonController.rowImage = [UIImage imageNamed:#"disclosureButtonControllerIcon.png"];
[array addObject:disclosureButtonController];
}
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidUnload
{
[super viewDidUnload];
self.controllers = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 0;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.controllers count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *FirstLevelCell = #"FirstLevelCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:FirstLevelCell];
if (cell == nil) {
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:FirstLevelCell];
}
// Configure the cell...
NSUInteger row = [indexPath row];
BiDSecondLevelController *controller = [controllers objectAtIndex:row];
cell.textLabel.text = controller.title;
cell.imageView.image = controller.rowImage;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
NSUInteger row = [indexPath row];
BiDSecondLevelController *nextController = [self.controllers objectAtIndex:row];
[self.navigationController pushViewController:nextController animated:YES];
}
#end

Answer 1

Your implementation of numberOfSectionsInTableView: returns 0, which means the table view should always be empty. Since returning 0 from this method doesn't make sense, I guess it's a typo.