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# systemSharingUIDidStopSharingBlock

A callback block the system invokes after the success or failure of a share delete by the system sharing UI.

```
@property (copy, nullable) void (^)(CKRecordID *, NSError *) systemSharingUIDidStopSharingBlock;
```

## Discussion

The system invokes this block on the success or failure of a [`CKShare`](/documentation/CloudKit/CKShare) delete when the user decides to stop sharing through the system sharing UI.

Each [`CKSystemSharingUIObserver`](/documentation/CloudKit/CKSystemSharingUIObserver) instance has a private serial queue. The system uses this queue for all callback block invocations.

---

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