基于索引路径行的自定义表单元格操作不起作用

Question

我似乎让我的 UITableView 自定义单元格（使用单独的 XIB）可以正确使用我的删除操作，正确删除 PROPER 单元格并刷新表视图并删除正确的单元格。

但是，当我尝试通过单击自定义单元格中的按钮来执行获取方向的操作时，无论单击哪个单元格，它似乎都只会推送该 SAME 事件，而不会更改 selectedEvent 对象详细信息。除非我删除单元格（使用有效的 deleteButton），然后单击另一个单元格，否则它不会更改。然后那个不会改变，直到我删除那个并单击另一个......等等。

知道出了什么问题吗？是因为我正在设置对象详细信息，并用它分配它，然后当他们回击时，它从未被释放过，或者当他们单击另一个时，细节永远不会改变？对不起，客观c的新手...

表视图.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"Cell";
        // Configure the cell...
    WatchingCustomCell *cell = (WatchingCustomCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"WatchingCustomCell" owner:self options:nil];
        cell = [nib objectAtIndex:0];
    }
    PFObject *events = [self.watchingEvents objectAtIndex:indexPath.row];
    self.selectedEvent = events;

    cell.deleteButton.tag = indexPath.row;
    [[cell deleteButton] addTarget:self action:@selector(deleteButtonAction:) forControlEvents:UIControlEventTouchUpInside];
    //...
    cell.directionsButton.tag = indexPath.row;
    [[cell directionsButton] addTarget:self action:@selector(directionsButtonAction:) forControlEvents:UIControlEventTouchUpInside];
    return cell;
}
-(IBAction) deleteButtonAction:(id) sender
{
[SVProgressHUD showWithStatus:@"Removing from Watch List..."];
PFRelation *relation = [self.currentUser relationforKey:@"watching"];
[relation removeObject:self.selectedEvent];
[self.watchingEvents removeObject:self.selectedEvent];
[self.currentUser saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
    if (error)
    {
        NSString *errorString = [[error userInfo] objectForKey:@"error"];
        UIAlertView *errorAlertView = [[UIAlertView alloc] initWithTitle:@"Error" message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [errorAlertView show];
    }
    else
    {
        [SVProgressHUD showSuccessWithStatus:@"Removed from Watch List!"];
        [self refreshTableView];
    }
}];
}
-(IBAction) directionsButtonAction:(id) sender
{
    DirectionsViewController *viewController = [[DirectionsViewController alloc] init];
    if (viewController != nil)
    {
        viewController.selectedEvent = self.selectedEvent;
    }
    [self presentViewController:viewController animated:YES completion:nil];
}

DirectionsViewController.m

- (void)viewDidLoad
{
  [super viewDidLoad];
   NSLog (@"%@", self.selectedEvent);
  // This isn't changing for some reason, unless the first cell that was selected was deleted, then another is clicked, and the chain continues. 
}

Answer 1

删除：

    PFObject *events = [self.watchingEvents objectAtIndex:indexPath.row];
        self.selectedEvent = events;

从cellForRowAtIndexPath并将其放在方向按钮像这样操作

-(IBAction) directionsButtonAction:(id) sender
{
    DirectionsViewController *viewController = [[DirectionsViewController alloc] init];
    if (viewController != nil)
    {
        viewController.selectedEvent = [self.watchingEvents objectAtIndex:[sender tag]];
    }
    [self presentViewController:viewController animated:YES completion:nil];
}

而这个

 [[cell deleteButton] addTarget:self action:@selector(deleteButtonAction:) forControlEvents:UIControlEventTouchUpInside];

应该在

 if (cell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"WatchingCustomCell" owner:self options:nil];
        cell = [nib objectAtIndex:0];
    }

因为 U 不想每次都为 R 刚刚创建的单元格或 U 通过 IB 创建的单元格执行此操作时都这样做，在这种情况下，U 不需要这行代码:)