ios - 从 TableView 中删除行 | NSUserDefaults + NSKeyedArchiver

Question

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    myFavsTwo = [NSMutableArray arrayWithArray:[NSKeyedUnarchiver unarchiveObjectWithData:[[[NSUserDefaults standardUserDefaults] objectForKey:@"MyFavoritez"] mutableCopy]]];
    [self.tableView reloadData];
    NSLog(@"Number of items in my array is: %d", [myFavsTwo count]);
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    NSLog(@"Number of items in my array is: %d", indexPath.row+1);
    [myFavsTwo removeObjectAtIndex:indexPath.row];
    [self.tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
   [[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:myFavsTwo] forKey:@"MyFavoritez"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

删除后，我的应用程序在以下位置不断崩溃:

       [[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver
archivedDataWithRootObject:myFavsTwo] forKey:@"MyFavoritez"];

如果我“继续”我的调试，它仍然可以正常工作，一切都像往常一样继续......没有收到任何错误消息，或者只是一条“断点”消息

我的 View 将如下所示:

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    myFavsTwo = [NSKeyedUnarchiver unarchiveObjectWithData:[[[NSUserDefaults standardUserDefaults] objectForKey:@"MyFavoritez"] mutableCopy]];
    [self.tableView reloadData];
    NSLog(@"Number of items in my array is: %d", [myFavsTwo count]);
}

信息来自这里:

- (void)buttonPressed:(id) sender
{

    NSMutableArray *myfavs = [[[NSUserDefaults standardUserDefaults] objectForKey:@"MyFavoritez"]mutableCopy];
    if(myfavs != nil)
    {
        NSLog(@"Array found. Contents: %@",myfavs);
    }
    else
    {
        myfavs = [[NSMutableArray alloc] initWithCapacity:0];
    }
    NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
    NSData *dataRepresentingSavedArray = [currentDefaults objectForKey:@"MyFavoritez"];
    if (dataRepresentingSavedArray != nil)
    {
        NSArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
        if (oldSavedArray != nil)
            _myfavs = [[NSMutableArray alloc] initWithArray:oldSavedArray];
        else
            _myfavs = [[NSMutableArray alloc] init];
    }

    [_myfavs addObject:self.word];
    [[NSUserDefaults standardUserDefaults] setObject:[NSKeyedArchiver archivedDataWithRootObject:_myfavs] forKey:@"MyFavoritez"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    NSLog(@"Number of items in my array is: %d", [_myfavs count]);
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {


    if ([[segue identifier] isEqualToString:@"passFavs"]) {
        FavViewController *con = segue.destinationViewController;
        con.myFavsTwo = _myfavs;    }
}

希望那不是TMI

Answer 1

看看这个答案中给出的建议 - crash on deleteRowsAtIndexPaths特别是，使用 [self.tableView beginUpdates] 和 [self.tableView endUpdates] 将对 TableView 和数据模型的更新括起来是一种很好的做法