Instance Method


Executes a given Block using the indexes in the specified range, using the specified enumeration options.


- (void)enumerateIndexesInRange:(NSRange)range options:(NSEnumerationOptions)opts usingBlock:(void (^)(NSUInteger idx, BOOL *stop))block;



The range to enumerate.


A bitmask that specifies the options for the enumeration (whether it should be performed concurrently and whether it should be performed in reverse order). See NSEnumerationOptions for the supported values.


The Block to apply to elements in the set.

The Block takes two arguments:


The index of the object.


A reference to a Boolean value. The block can set the value to YES to stop further processing of the set. The stop argument is an out-only argument. You should only ever set this Boolean to YES within the Block.


This method executes synchronously.

See Also

Enumerating Indexes

- enumerateIndexesUsingBlock:

Executes a given Block using each object in the index set.

- enumerateIndexesWithOptions:usingBlock:

Executes a given Block over the index set’s indexes, using the specified enumeration options.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

Learn more about using Apple's beta software