Question

我正在处理2个观点。主视图和子视图。

Main View的tablecell字符串显示该单元格子视图中对象数量的计数。当我从子视图中删除一个单元格并返回到mainView时，显示计数的字符串应该减少1.此时此字符串不会更改，直到我重新启动应用程序。

我有什么想法可以解决这个问题？计数是从NSFetch中提取的。

编辑：添加代码

- (void)configureCell:(TDBadgedCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
    NSDate *today = [NSDate date]; 
    NSDate *thisWeek  = [today dateByAddingTimeInterval: -604800.0];
    NSDate *thisMonth = [today dateByAddingTimeInterval: -2629743.83];
    else if (indexPath.row == 2)
    {
        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
        self.predicate = [NSPredicate predicateWithFormat:@"(timeStamp >= %@) AND (timeStamp <= %@)", thisWeek, today];
        [fetchRequest setPredicate: predicate];
        [fetchRequest setEntity:[NSEntityDescription entityForName:@"Session" inManagedObjectContext:managedObjectContext]];
        NSError *error = nil;
        NSArray *results = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
        NSLog(@"Fetch error: %@", error);

        cell.badgeString = [NSString stringWithFormat:@"%i", [results count]];
        [fetchRequest release];
    }
    else if (indexPath.row == 3)
    {
        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
        self.predicate = [NSPredicate predicateWithFormat:@"(timeStamp >= %@) AND (timeStamp <= %@)", thisMonth, today];
        [fetchRequest setPredicate:predicate];
        [fetchRequest setEntity:[NSEntityDescription entityForName:@"Session" inManagedObjectContext:managedObjectContext]];

        NSError *error = nil;
        NSArray *results = [managedObjectContext executeFetchRequest:fetchRequest error:&error];
        NSLog(@"Fetch error: %@", error);

        cell.badgeString = [NSString stringWithFormat:@"%i", [results count]];
        [fetchRequest release];
    }
    else if (indexPath.row == 4)
    {
        cell.badgeString = [NSString stringWithFormat:@"%i", [[self.fetchedResultsController fetchedObjects] count]];
    }

Answer 1

如果您的数据实际上在模型方面正确更新，您应该可以调用

[tableView reloadData];

一切都会正确更新。你可以将它放在viewWillAppear中。

希望这有帮助。

Answer 2

您需要确保在tableview上获得正确的句柄，如果您已在头文件中为tableview创建了一个访问器，那么您需要在viewWillLoad方法中使用该名称调用它。

如何重新加载表？

2 个答案: