披露按钮，图标不显示在一级控制器中

Question

我已经为FirstLevelController实现文件编写了以下代码，但Disclosure Buttons和图标不会显示在视图中。已经检查了代码，但无法找出问题所在。

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

numberOfSectionsInTableView:的实现返回0，这意味着表视图应该始终为空。由于从这个方法返回0没有意义，我想这是一个拼写错误。