NSIndexSet

Posted by On 8月 06, 2013 0 Comment

NSIndexSet is like BitSet of Java. Mutable version is NSMutableIndexSet.

This class keeps only index(not duplicate).

Add index(NSMutableIndexSet)

NSMutableIndexSet indexes = [[NSMutableIndexSet alloc] init];
[indexes addIndex:1];
[indexes addIndex:2];
[indexes addIndex:3];

Create from index(not mutable)

NSMutableIndexSet indexes = [[NSMutableIndexSet alloc] init];
NSIndexSet* nindexes = [[NSIndexSet alloc] initWithIndexSet:indexes];

Enumeration

BlockEnumeration

[indexes enumerateIndexesUsingBlock:^(NSUInteger idx, BOOL *stop)
{
}];

Use block code. Index was kept by NSUInteger idx.

First and get next

NSUInteger idx = indexes.firstIndex;;
while (idx != NSNotFound)
{
   // idx is current index.

   // Next index
   idx = [indexes indexGreaterThanIndex:indexValue];
}

Reference

Apple Developer

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