Instance Property cancellation Handler
The block to invoke when progress is cancelled.
iOS 7.0+ macOS 10.9+ Mac Catalyst 13.0+ Beta tvOS 9.0+ watchOS 2.0+ Declaration @property(copy) void (^ cancellationHandler)( void);
If the receiver is a child of another progress object, the
block will be invoked when the parent is cancelled.
cancellation Handler Special Considerations
You are responsible for cancelling any work associated with the progress object.
The cancellation handler may be invoked on any queue. If you must do work on a specific queue, you should dispatch to that queue from within the cancellation handler block.
See Also Controlling Progress cancellable
Indicates whether the receiver is tracking work that can be cancelled.
Indicates whether the receiver is tracking work that has been cancelled.
Indicates whether the receiver is tracking work that can be paused.
Indicates whether the receiver is tracking work that has been paused.
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