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# isCancellable

A Boolean value that indicates whether the receiver is tracking work that you can cancel.

```
var isCancellable: Bool { get set }
```

## Discussion

By default, [`Progress`](/documentation/Foundation/Progress) objects are cancelable.

You typically use this property to communicate whether controls for canceling appear in a progress-reporting user interface. [`Progress`](/documentation/Foundation/Progress) itself doesn’t do anything with this property other than help pass the value from progress reporters to progress observers.

If an [`Progress`](/documentation/Foundation/Progress) is cancelable, implement the ability to cancel progress either by setting a block for the [`cancellationHandler`](/documentation/Foundation/Progress/cancellationHandler) property, or by polling the [`isCancelled`](/documentation/Foundation/Progress/isCancelled) property periodically while performing the relevant work.

It’s valid for the value of this property to change during the lifetime of an [`Progress`](/documentation/Foundation/Progress) object. By default, [`Progress`](/documentation/Foundation/Progress) is KVO-compliant for this property. It sends notifications on the same thread that updates the property.

## See Also

[`cancel()`](/documentation/Foundation/Progress/cancel())

Cancels progress tracking.


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