尝试将第0行插入第0部分，但更新后第0部分只有0行

Question

I have this crash.

I have tried everything. I have searched in Google for 3 days to understand why my app crashes, and I didn't find anything. I found a lot of similar posts, tried to used some from here and there, but still getting a crash.

Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to insert row 0 into section 0, but there are only 0 rows in section 0 after the update'
First throw call stack:

My .m file:

#import "PlayersViewController.h"
#import "Player.h"
#import "PlayerCell.h"

@interface PlayersViewController ()
@end

@implementation PlayersViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    PlayerCell *cell = (PlayerCell *)[tableView
                                      dequeueReusableCellWithIdentifier:@"PlayerCell"];
    Player *player = [self.players objectAtIndex:indexPath.row];
    cell.nameLabel.text = player.name;
    return cell;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete)
    {
        [self.players removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }
}

- (void)playerDetailsViewControllerDidCancel:
    (PlayerDetailsViewController *)controller
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)playerDetailsViewControllerDidSave:
    (PlayerDetailsViewController *)controller
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"AddPlayer"])
    {
        UINavigationController *navigationController =
        segue.destinationViewController;
        PlayerDetailsViewController
        *playerDetailsViewController =
        [[navigationController viewControllers]
         objectAtIndex:0];
        playerDetailsViewController.delegate = self;
    }
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;
{
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.players count];
}

- (void)playerDetailsViewController:
(PlayerDetailsViewController *)controller
                       didAddPlayer:(Player *)player
{
    [self.players addObject:player];

    [NSThread sleepForTimeInterval:0.5];

    [self.tableView beginUpdates];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
    [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
    [self.tableView endUpdates];

    [self dismissViewControllerAnimated:YES completion:nil];
}

@end

I hope you can help.

Answer 1

Have you give the cell identifier to PlayerCell from storyboard? Define viewDidLoad method in your .m file.

I your .h file add delegate and datasource for table view, Like UITableViewDataSource and UITableViewDlegate.

After that in your .m file and in viewDidLoad method add,

self.tableView.delegate = self;
[self.tableView setDataSource : self];

This might help you.

You can log the array of players and see it is not nil. For your player methods and logic make new model file and write player logic there and import it in your table view.

Answer 2

Between beginUpdates and endUpdates you must modify both the tableview and the datasource in a matching way. You don't do that. You only modify the tableview.

And I'd recommend to learn and use the Objective-C array syntax and Objective-C literals. "[self.players objectAtIndex:indexPath.row]" becomes "self.players [indexPath.row]" and "[NSArray arrayWithObject:indexPath]" becomes "@[indexPath]".