# isCancelled A Boolean value that indicates whether the task should stop executing. ``` var isCancelled: Bool { get } ``` ## Discussion After the value of this property becomes `true`, it remains `true` indefinitely. There is no way to uncancel a task. This property returns the actual cancellation state of the task, regardless of whether a cancellation shield is active. Use [`isCancelled`](/documentation/Swift/Task/isCancelled-swift.type.property) (the static property) if you need cancellation checking that respects active shields. ### Instance property isCancelled ignores Task Cancellation Shields The instance property [`isCancelled`](/documentation/Swift/Task/isCancelled-swift.property) is not contextual and therefore does not respect cancellation shields. If a task was cancelled and is executing with an active cancellation shield, these properties will return the *actual* cancellation status of the specific task. Prefer using [`isCancelled`](/documentation/Swift/Task/isCancelled-swift.type.property) (the static property) in most situations when checking the cancellation status from inside the task. > SeeAlso: ```Task/isCancelled-type.property`` > SeeAlso: ``doc://com.apple.Swift/documentation/Swift/Task/checkCancellation()`` > SeeAlso: ``doc://com.apple.Swift/documentation/Swift/Task/hasActiveCancellationShield`` > SeeAlso: ``withTaskCancellationShield(operation:)-(()->Value)`` --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)