How to increment an NSIndexPath

objective-c ios nsindexpath
drekka picture drekka · Mar 9, 2012 · Viewed 7.3k times · Source

I have a data situation where I want to use an index path. As I'm traversing the data I want to increment the last node of an NSIndexPath. The code I have so far is:

int nbrIndex = [indexPath length];
NSUInteger *indexArray = (NSUInteger *)calloc(sizeof(NSUInteger),nbrIndex);
[indexPath getIndexes:indexArray];
indexArray[nbrIndex - 1]++;
[indexPath release];
indexPath = [[NSIndexPath alloc] initWithIndexes:indexArray length:nbrIndex];
free(indexArray);

This feels a bit, well, clunky - Is there a better way to do it?

Answer

Sergey Kalinichenko picture Sergey Kalinichenko · Mar 9, 2012

You can try this - perhaps equally clunky, but at least a bit shorter:

NSInteger newLast = [indexPath indexAtPosition:indexPath.length-1]+1;
indexPath = [[indexPath indexPathByRemovingLastIndex] indexPathByAddingIndex:newLast];

Related questions

Get Selected index of UITableView

I want to have selected index for UITableView. I have written following code: NSIndexPath *index = [NSIndexPath indexPathForRow:1 inSection:0]; [tableView scrollToRowAtIndexPath:index atScrollPosition:UITableViewScrollPositionTop animated:YES]; This always work for 1st item. I want to have selected index in indexPathForRow. Please …

Read More
Convert NSInteger to NSIndexpath

Basically I am storing an index of an array in a NSInteger. I now need it as an NSIndexpath, I'm struggling to see and find a way to convert my NSInteger to NSIndexpath so I can reuse it.

Read More
iOS: reload single cell of UICollectionView

I am trying to follow the following post on reload a cell in a UICollectionView: UICollectionView update a single cell I know that I ultimately want something that looks like this: [self.collectionView reloadItemsAtIndexPaths:??]; But I don't know how to …

Read More