Iphone iOS tableView帮助

我正在尝试创建一个允许我删除和添加项目的tableView。我遇到的最大问题是我的所有细胞都无法显示。我不确定我漏掉了什么。这是TableViewController类

#import "GroceryListTableViewController.h"

@implementation GroceryListTableViewController


@synthesize groceries;

/*- (NSMutableArray *) groceries
{
    if(groceries == nil)
        [self addToGroceries:@"Groceries"];
    return groceries;
}*/
- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    self.groceries = [NSMutableArray arrayWithObjects:@"Steak", @"Juice", @"Stuff", nil];

    if (self) {
    }
    return self;
}

-(void) addToGroceries:(NSString *)grocery
{
    [self.groceries addObject:grocery];
}

- (void)dealloc
{
    [groceries release];
    [super dealloc];
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
     self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [self.groceries count];
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"GroceryListCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

    }

    cell.textLabel.text = [self.groceries objectAtIndex:indexPath.section];

    // Configure the cell...

    return cell;
}

/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/


// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     [detailViewController release];
     */
}

@end

谢谢你的帮助。我认为问题在于我在列表中填充了项目，但我尝试了其他方法，例如构造函数，但它们也不起作用。

---

我对代码进行了编辑，以使其成为正确的解决方案，因此其他问题能够帮助您尝试这一点……尽管代码的其余部分可能需要一些审阅

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

---

不，这是一种可选方法。如果没有，默认情况下它将返回1。正确。如果存在，则应返回1或实际节数。它可能是其他开发的占位符。lipd可以返回1并检查或完全删除它，或者如果tableview需要额外的复杂性，则将其保留为占位符。是的，我完全忘记了删除此方法，因此它现在会在列表中显示项目，但由于某些原因，只有我的NSMutableArray中的第一个项目显示为数组大小的3倍。我想这只是一些逻辑错误，因为我正试图遵循关于TableView的教程，可能只是弄糟了一些东西，因为我所做的略有不同；谢谢你，乔丹！我仍在尝试适应所有语法。假设groceries是一个retain属性，则会出现内存泄漏，因为您也在手动调用retain。感谢您的提示，因为我实际上使用的是一本书中的方法，甚至没有注意到我导致了泄漏。