Question

我有一个按字母顺序划分的tableview。我有一个NSMutableArray *drinks这是我的原始数据源，它从plist中填充NSMutableDictionary's。在我的viewDidLoad方法中。然后我遍历我的数组，并在viewWillAppear方法

中为每个部分中的部分和行数创建关键字。

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    self.sections = [[NSMutableDictionary alloc] init];
    BOOL found;

    // Loop through the whiskys and create our keys
    for (NSMutableDictionary *whisky in self.drinks)
    {
        NSString *c = [[whisky objectForKey:NAME_KEY] substringToIndex:1];

        found = NO;

        for (NSString *str in [self.sections allKeys])
        {
            if ([str isEqualToString:c])
            {
                found = YES;
            }
        }

        if (!found)
        {
            [self.sections setValue:[[NSMutableArray alloc] init] forKey:c];
        }
    }
    // Loop again and sort the whiskys into their respective keys
    for (NSDictionary *whisky in self.drinks)
    {
        [[self.sections objectForKey:[[whisky objectForKey:NAME_KEY] substringToIndex:1]] addObject:whisky];
    }
    // Sort each section array
    for (NSString *key in [self.sections allKeys])
    {
        [[self.sections objectForKey:key] sortUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:NAME_KEY ascending:YES]]];
    }
        [self.tableView reloadData];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view

    NSArray *searchPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [searchPaths lastObject];
    NSString *writeableDBPath = [documentsDirectory stringByAppendingPathComponent:@"ScotchList.plist"];

    NSMutableArray *tmpArray = [[NSMutableArray alloc]initWithContentsOfFile:writeableDBPath];

    self.drinks = tmpArray;

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(applicationDidEnterBackground:) 
                                                 name:UIApplicationDidEnterBackgroundNotification
                                               object:nil];

    //Register for application exiting information so we can save data
    [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(applicationWillTerminate:) name:UIApplicationWillTerminateNotification object:nil];

}

所有这一切都很好，花花公子。然后，当我删除一行时，它也可以正常工作。然而，当我进入新视图并返回到tableview时，已删除的行重新出现。所以我需要更新我的原始数据源（饮料），因为每次viewAppears它再次从原始数据源拉取。所以我试着把这个项目（威士忌）放在那一行，然后将它从数组中删除。但它引发了一个sigabrt。这是我的删除行方法。

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        //DELETE THE ROW FROM THE DATA SOURCE
        [self.tableView beginUpdates];

        [[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] removeObjectAtIndex:indexPath.row];

        NSDictionary *whisky = [[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];
        [self.drinks removeObject:whisky];

        if ([[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] count] > 0)
        {
            // Section is not yet empty, so delete only the current row.
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];

        }
        else
        {
            // Section is now completely empty, so delete the entire section.
            [self.sections removeObjectForKey:[[[self.sections allKeys] sortedArrayUsingSelector:@selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]];
            [tableView deleteSections:[NSIndexSet indexSetWithIndex:indexPath.section]
                     withRowAnimation:UITableViewRowAnimationFade];
        }

        [self.tableView endUpdates];
    } 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.
    }
}

这是日志显示的内容：

2012-07-06 15:36:42.454 WhiskyBook[3275:907] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 1 beyond bounds [0 .. 0]'

*** First throw call stack:

(0x3998a17b 0x3494395b 0x398d83bd 0x3e6b5 0x32a0cd11 0x328f0d09 0x328f0cbb 0x328f0c95 0x328f09eb 0x328f1369 0x328ef791 0x328dd72d 0x328dd009 0x339a7603 0x339a7233 0x3995a873 0x3995a817 0x39959611 0x398d6be5 0x398d6a71 0x339a634b 0x329037f5 0x3ac09 0x33cc7b20)

libc++abi.dylib: terminate called throwing an exception

(lldb)

我做错了什么？

Answer 1

我找到了解决问题的方法。我没有尝试从commitEditingStyle方法内部的原始数据源中删除对象，而是为我的master-viewController创建了一个NSDictionary属性，并在我的viewDidLoad中将其插入，然后为其分配了我想要删除的项目。 commitEditingStyle方法。然后在我的viewWillDisappear方法中，我将其从原始数据源中删除。

删除项后，从分段表视图更新NSMutableArray

1 个答案: