TableView, delete cell but not section

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TableView, delete cell but not section

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#1 by (2 votes)

2

I have a tableView where I would like to delete the cells of the sections and if it is the last, instead of deleting the section too, I wanted to add a new cell with a new string: @ "there are no cells in this section". For some reason the code below is not working.

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 3;
}

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

NSMutableArray *spotType = [self spotsWithSection: section];

return spotType.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

NSUInteger section = indexPath.section;
NSUInteger row = indexPath.row;

NSMutableArray *thisSpotContainer = [self spotsWithSection:section];
Spot *s = (Spot*)thisSpotContainer[row];
cell.textLabel.text = s.name;

return cell;
}




- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {

    NSMutableArray *thisSpotContainer = [self spotsWithSection: indexPath.section];

    if ([thisSpotContainer count] > 0) {
        [tableView beginUpdates];

        [thisSpotContainer removeObjectAtIndex:[indexPath row]];

        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];


        if ([thisSpotContainer count] == 0) {

            NSArray *noSpotsHere = [NSArray arrayWithObjects:@"This section has no spots.", nil];
            [thisSpotContainer insertObject:noSpotsHere atIndex:0];

            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

        }

        [tableView endUpdates];
    }

}

}

- (NSMutableArray*) spotsWithSection:(NSUInteger)section {

NSArray * Spots = [Spot allSpots];
NSPredicate *predicate;

switch (section) {
    case 0:
        predicate = [NSPredicate predicateWithFormat:@"type = %@", @"restaurant"];
        spotRest = [[Spots filteredArrayUsingPredicate:predicate] mutableCopy];
        return spotRest;
        break;
    case 1:
        predicate = [NSPredicate predicateWithFormat:@"type = %@", @"bar"];
        spotBar = [[Spots filteredArrayUsingPredicate:predicate] mutableCopy];            return spotBar;
        break;
    case 2:
        predicate = [NSPredicate predicateWithFormat:@"type = %@", @"club"];
        spotClub = [[Spots filteredArrayUsingPredicate:predicate] mutableCopy];
        return spotClub;
        break;
}
}

ios objective-c

asked by anonymous 17.02.2016 / 10:57

1 answer

Make insert / update with values from other tables SubQuery with Linq

score 2 · Accepted Answer

Apparently, these lines do not influence anything:

 NSArray *noSpotsHere = [NSArray arrayWithObjects:@"This section has no spots.", nil];
[thisSpotContainer insertObject:noSpotsHere atIndex:0];

Since in cellForRowAtIndexPath you are loading the array again from something that looks like a bank, overlapping what you inserted into it.

What you can do is, at commitEditingStyle after:

   [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];

put:

  UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
  cell.textLabel.text = @"This section has no spots.";

However, the other problem is that if a reloadData occurs the line will disappear.

What I suggest doing is putting a reloadData after deletion:

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
      if (editingStyle == UITableViewCellEditingStyleDelete) {
          NSMutableArray *thisSpotContainer = [self spotsWithSection: indexPath.section];
         if ([thisSpotContainer count] > 0) {
            [tableView beginUpdates];
            [thisSpotContainer removeObjectAtIndex:[indexPath row]];
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
            if ([thisSpotContainer count] == 0) {
                 [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
                UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];
               cell.textLabel.text = @"This section has no spots.";
            }
         }
         [tableView endUpdates];
    }
    [tableview reloadData]
}

e:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

    NSUInteger section = indexPath.section;
    NSUInteger row = indexPath.row;

    NSMutableArray *thisSpotContainer = [self spotsWithSection:section];
    if (thisSpotContainer.count == 0) {
       cell.textLabel.text = @"This section has no spots.";
    }else{
        Spot *s = (Spot*)thisSpotContainer[row];
        cell.textLabel.text = s.name;
    }
  return cell;
}

and no

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

     NSMutableArray *spotType = [self spotsWithSection: section];
     int linhas = spotType.count;
     if (linhas == 0) {
        linhas = 1;
     }
     return linhas;
}