Question

我为我的应用程序设置了此代码，该代码具有与记事本类似的功能：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) 
    {
        // Set ignoreDefaultsChanged to YES so that the defaultsChanged method won't interfere with the deletion of a summary
        ignoreDefaultsChanged = YES;

        // OUT OF BOUNDS ERROR
        [_objects removeObjectAtIndex:indexPath.row];
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];

        // Delete the associated information
        [[NSUserDefaults standardUserDefaults] removeObjectForKey:[NSString stringWithFormat:@"%@%@", _objects[indexPath.row], @"-summary"]];

        // Save the new list of combined summaries
        [[NSUserDefaults standardUserDefaults] setObject:_objects forKey:@"prepareKey"];
    } 
    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.
    }
}

- (void)defaultsChanged:(NSNotification *)notification {
    if (ignoreDefaultsChanged == YES) 
    {
        // Do nothing
    } 
    else if (ignoreDefaultsChanged == NO)
    {
        // Setup savingKey
        savingKey = @"prepareKey";

        // Load the items from NSUserDefaults
        _objects = [NSMutableArray arrayWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:savingKey]];

        // Reload the tableView
        [self.tableView reloadData];
    }
}

- (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.leftBarButtonItem = self.editButtonItem;

    // Register a class or nib file using registerNib:forCellReuseIdentifier
    // o registerClass:forCellReuiseIdentifier: method before calling this method
    [self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];

    // Setup savingKey
    savingKey = @"prepareKey";

    // Load the items from NSUserDefaults
    _objects = [NSMutableArray arrayWithArray:[[NSUserDefaults standardUserDefaults] objectForKey:savingKey]];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(defaultsChanged:) name:NSUserDefaultsDidChangeNotification object:nil];
}

如果我现在尝试删除最底部的单元格，应用程序会崩溃并显示以下消息：

Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 2 beyond bounds [0 .. 5]'

有关如何解决此问题的任何想法？

超出界限错误UITableView

0 个答案: