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# CKSystemSharingUIObserver

An object the system uses to monitor changes in sharing.

```
class CKSystemSharingUIObserver
```

## Overview

Initialize a `CKSystemSharingUIObserver` instance with your [`CKContainer`](/documentation/CloudKit/CKContainer) when preparing to share an item using the share sheet. Use your implementation to update the local state of a shared item when your app receives a [`CKShare`](/documentation/CloudKit/CKShare), or to delete a locally cached share when the system notifies your app about a share deletion.

The system only propagates changes on the local device using `CKSystemSharingUIObserver`. The system doesn’t notify your app about any remote changes on the server. For more information about how to keep your local cache in sync with remote changes, see [Remote Records](/documentation/CloudKit/remote-records).

## Topics

### Creating a sharing observer

[`-  initWithContainer:`](/documentation/CloudKit/CKSystemSharingUIObserver/init(container:))

Creates and initializes an observer using the provided container.

### Configuring a sharing observer

### Accessing sharing blocks

[`systemSharingUIDidSaveShareBlock`](/documentation/CloudKit/CKSystemSharingUIObserver/systemSharingUIDidSaveShareBlock-8c9vi)

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

[`systemSharingUIDidStopSharingBlock`](/documentation/CloudKit/CKSystemSharingUIObserver/systemSharingUIDidStopSharingBlock-7nmiw)

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

[`systemSharingUIDidSaveShareBlock`](/documentation/CloudKit/CKSystemSharingUIObserver/systemSharingUIDidSaveShareBlock-39zlv)

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

[`systemSharingUIDidStopSharingBlock`](/documentation/CloudKit/CKSystemSharingUIObserver/systemSharingUIDidStopSharingBlock-4g5bn)

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

## Relationships

### Conforms To

[`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible)

[`CVarArg`](/documentation/Swift/CVarArg)

[`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible)

[`Hashable`](/documentation/Swift/Hashable)

[`Equatable`](/documentation/Swift/Equatable)

[`Sendable`](/documentation/Swift/Sendable)

### Inherits From

[`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class)

---

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