Tells the URL session that the session has been invalidated.
- iOS 7.0+
- macOS 10.9+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
The session object that was invalidated.
The error that caused invalidation, or
nil if the invalidation was explicit.
If you invalidate a session by calling its
finishTasksAndInvalidate method, the session waits until after the final task in the session finishes or fails before calling this delegate method. If you call the
invalidateAndCancel method, the session calls this delegate method immediately.
Handling Session Life Cycle Changes
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