动态数组返回的数量numberOfRowsInSection

Question

I have problem with deleting rows from my tableView , because I have multiple sections that are dynamically generated when view controller appears, so when I return the count in numberOfRowsInSection it ends up looking like this:

NSInteger count = [[_sectionsArray objectAtIndex:section] count];
return count;

Now when deleting I generate this same type of array like this:

NSMutableArray *contentsOfSection = [[_sectionsArray objectAtIndex:[indexPath section]] mutableCopy];
[contentsOfSection removeObjectAtIndex:[indexPath row]];

As you can see I'm deleting the object from an array that is not linked to the tableView , so it just returns an NSInternalInconsistencyException

Can anybody help me with this?

UPDATE:

    [contentsOfSection removeObjectAtIndex:[pathToCell row]];

    if ([contentsOfSection count] != 0) {
        // THIS DOESN'T
        [self.tableView deleteRowsAtIndexPaths:@[pathToCell] withRowAnimation:UITableViewRowAnimationFade];
    }
    else {
        // THIS WORKS!
        [_sectionsArray removeObjectAtIndex:[pathToCell section]];
        [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:[pathToCell section]] withRowAnimation:UITableViewRowAnimationFade];
    }

Answer 1

muatableCopy will create another instance of the array. So you are removing item from the newly created array not from the old one. Always store 'contentsOfSection ' as a mutable array in _sectionsArray. Then remove like this.

NSMutableArray *contentsOfSection = [_sectionsArray objectAtIndex:[indexPath section]];
[contentsOfSection removeObjectAtIndex:[pathToCell row]];

if ([contentsOfSection count] != 0) {

    [self.tableView deleteRowsAtIndexPaths:@[pathToCell] withRowAnimation:UITableViewRowAnimationFade];
}
else {
    // THIS WORKS!
    [_sectionsArray removeObjectAtIndex:[pathToCell section]];
    [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:[pathToCell section]] withRowAnimation:UITableViewRowAnimationFade];
}

Answer 2

In following code :

[_sectionsArray removeObjectAtIndex:[pathToCell section]];
[self.tableView deleteSections:[NSIndexSet indexSetWithIndex:[pathToCell section]] withRowAnimation:UITableViewRowAnimationFade];

You are deleting object from _sectionArray. So this array automatically updates. But in other cases you are creating another copy and then deleting object from that array. So your _sectionArray is not going to update. So this is necessary that after deleting object from copy array, update section array with that new array also.

NSMutableArray *contentsOfSection = [[_sectionsArray objectAtIndex:[indexPath section]] mutableCopy];
[contentsOfSection removeObjectAtIndex:[indexPath row]];
[_sectionsArray replaceObjectAtIndex:[indexPath section] withObject:contentsOfSection];

Try this one and I hope that this will work.