ListObjectObserver

public protocol ListObjectObserver : ListObserver

Implement the ListObjectObserver protocol to observe detailed changes to a list’s object. ListObjectObservers may register themselves to a ListMonitor‘s addObserver(_:) method:

let monitor = dataStack.monitorList(
    From<MyPersonEntity>(),
    OrderBy(.ascending("lastName"))
)
monitor.addObserver(self)


                    
                    
                    listMonitor(_:didInsertObject:toIndexPath:sourceIdentifier:)

Default implementation

Notifies that an object was inserted to the specified NSIndexPath in the list. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didInsertObject object: ListEntityType,
    toIndexPath indexPath: IndexPath,
    sourceIdentifier: Any?
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`object`	the entity type for the inserted object
`indexPath`	the new `NSIndexPath` for the inserted object
`sourceIdentifier`	an optional identifier provided by the transaction source


                    
                    
                    listMonitor(_:didInsertObject:toIndexPath:)

Default implementation

Notifies that an object was inserted to the specified NSIndexPath in the list. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didInsertObject object: ListEntityType,
    toIndexPath indexPath: IndexPath
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`object`	the entity type for the inserted object
`indexPath`	the new `NSIndexPath` for the inserted object


                    
                    
                    listMonitor(_:didDeleteObject:fromIndexPath:sourceIdentifier:)

Default implementation

Notifies that an object was deleted from the specified NSIndexPath in the list. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didDeleteObject object: ListEntityType,
    fromIndexPath indexPath: IndexPath,
    sourceIdentifier: Any?
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`object`	the entity type for the deleted object
`indexPath`	the `NSIndexPath` for the deleted object
`sourceIdentifier`	an optional identifier provided by the transaction source


                    
                    
                    listMonitor(_:didDeleteObject:fromIndexPath:)

Default implementation

Notifies that an object was deleted from the specified NSIndexPath in the list. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didDeleteObject object: ListEntityType,
    fromIndexPath indexPath: IndexPath
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`object`	the entity type for the deleted object
`indexPath`	the `NSIndexPath` for the deleted object


                    
                    
                    listMonitor(_:didUpdateObject:atIndexPath:sourceIdentifier:)

Default implementation

Notifies that an object at the specified NSIndexPath was updated. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didUpdateObject object: ListEntityType,
    atIndexPath indexPath: IndexPath,
    sourceIdentifier: Any?
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`object`	the entity type for the updated object
`indexPath`	the `NSIndexPath` for the updated object
`sourceIdentifier`	an optional identifier provided by the transaction source


                    
                    
                    listMonitor(_:didUpdateObject:atIndexPath:)

Default implementation

Notifies that an object at the specified NSIndexPath was updated. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didUpdateObject object: ListEntityType,
    atIndexPath indexPath: IndexPath
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`object`	the entity type for the updated object
`indexPath`	the `NSIndexPath` for the updated object


                    
                    
                    listMonitor(_:didMoveObject:fromIndexPath:toIndexPath:sourceIdentifier:)

Default implementation

Notifies that an object’s index changed. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didMoveObject object: ListEntityType,
    fromIndexPath: IndexPath,
    toIndexPath: IndexPath,
    sourceIdentifier: Any?
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`object`	the entity type for the moved object
`fromIndexPath`	the previous `NSIndexPath` for the moved object
`toIndexPath`	the new `NSIndexPath` for the moved object
`sourceIdentifier`	an optional identifier provided by the transaction source


                    
                    
                    listMonitor(_:didMoveObject:fromIndexPath:toIndexPath:)

Default implementation

Notifies that an object’s index changed. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didMoveObject object: ListEntityType,
    fromIndexPath: IndexPath,
    toIndexPath: IndexPath
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`object`	the entity type for the moved object
`fromIndexPath`	the previous `NSIndexPath` for the moved object
`toIndexPath`	the new `NSIndexPath` for the moved object