使用核心数据时在 UITableView 顶部添加新行

Question

我有一个文本字段，我在其中输入一个值并将其保存并在 tableView 中检索它们。 最后保存的项目显示在表格视图的底部。 但我希望它显示在表格视图的顶部。

我尝试了以下代码但失败了。

- (void)viewDidLoad
{

   CoreDataOneAppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
   NSManagedObjectContext *context = [appDelegate managedObjectContext];
   NSEntityDescription *entityDesc = 
   [NSEntityDescription entityForName:@"Employee" inManagedObjectContext:context];
   NSFetchRequest *request = [[NSFetchRequest alloc] init];
   [request setEntity:entityDesc];
    NSError *error;
    objects = [[context executeFetchRequest:request error:&error]retain];
    [request release];
    [super viewDidLoad];
}



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

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    labelOne = [[UILabel alloc]initWithFrame:CGRectMake(5, 11, 110, 21)];
    labelTwo = [[UILabel alloc]initWithFrame:CGRectMake(230, 11, 70, 21)];

    static NSString *cellIdentifier = @"CellIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:cellIdentifier]autorelease];
    }

    [cell.contentView addSubview:labelTwo];
    [cell.contentView addSubview:labelOne];

    NSManagedObject *matches = nil;
    matches = [objects objectAtIndex:indexPath.row];

    labelOne.text = [matches valueForKey:@"name"];
    labelTwo.text = [matches valueForKey:@"amount"];

    NSArray *index = [NSArray arrayWithObject:[NSIndexPath indexPathForRow:0 inSection:0]];
    [tableView insertRowsAtIndexPaths:index withRowAnimation:YES];

    return cell;
}

//保存

-(IBAction)save:(id)sender
{
CoreDataOneAppDelegate  *appDelegate = 
[[UIApplication sharedApplication] delegate];

NSManagedObjectContext *context = 
[appDelegate managedObjectContext];
NSManagedObject *newContact;
newContact = [NSEntityDescription
              insertNewObjectForEntityForName:@"Employee"
              inManagedObjectContext:context];
[newContact setValue:name.text forKey:@"name"];
[newContact setValue:amount.text forKey:@"amount"];
name.text = @"";
amount.text = @"";
//label
status.text = @"saved";
NSError *error;
[context save:&error];
}

Answer 1

我假设你在某个地方做[objects addObject:newEntry]。将其更改为 [objects insertObject:newEntry atIndex:0]。