Cancels the specified dispatch block asynchronously.
SDKs
- iOS 8.0+
- macOS 10.10+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
Framework
- Dispatch
Declaration
void dispatch_block_cancel(dispatchParameters
blockThe dispatch block to cancel.
The result of passing
NULLor a block object not returned by thedispatchor_block _create dispatchfunction is undefined._block _create _with _qos _class
Discussion
Cancellation causes any future execution of the dispatch block to return immediately, but does not affect any execution of the block object that is already in progress.
Release of any resources associated with the block object is delayed until execution of the block object is next attempted (or any execution already in progress completes).