ListSectionObserver

public protocol ListSectionObserver : ListObjectObserver

Implement the ListSectionObserver protocol to observe changes to a list’s section info. ListSectionObservers may register themselves to a ListMonitor‘s addObserver(_:) method:

let monitor = dataStack.monitorSectionedList(
    From<MyPersonEntity>(),
    SectionBy("age") { "Age \($0)" },
    OrderBy(.ascending("lastName"))
)
monitor.addObserver(self)


                    
                    
                    listMonitor(_:didInsertSection:toSectionIndex:sourceIdentifier:)

Default implementation

Notifies that a section was inserted at the specified index. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didInsertSection sectionInfo: NSFetchedResultsSectionInfo,
    toSectionIndex sectionIndex: Int,
    sourceIdentifier: Any?
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`sectionInfo`	the `NSFetchedResultsSectionInfo` for the inserted section
`sectionIndex`	the new section index for the new section
`sourceIdentifier`	an optional identifier provided by the transaction source


                    
                    
                    listMonitor(_:didInsertSection:toSectionIndex:)

Default implementation

Notifies that a section was inserted at the specified index. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didInsertSection sectionInfo: NSFetchedResultsSectionInfo,
    toSectionIndex sectionIndex: Int
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`sectionInfo`	the `NSFetchedResultsSectionInfo` for the inserted section
`sectionIndex`	the new section index for the new section


                    
                    
                    listMonitor(_:didDeleteSection:fromSectionIndex:sourceIdentifier:)

Default implementation

Notifies that a section was inserted at the specified index. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didDeleteSection sectionInfo: NSFetchedResultsSectionInfo,
    fromSectionIndex sectionIndex: Int,
    sourceIdentifier: Any?
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`sectionInfo`	the `NSFetchedResultsSectionInfo` for the deleted section
`sectionIndex`	the previous section index for the deleted section
`sourceIdentifier`	an optional identifier provided by the transaction source


                    
                    
                    listMonitor(_:didDeleteSection:fromSectionIndex:)

Default implementation

Notifies that a section was inserted at the specified index. (Optional) The default implementation does nothing.

Default Implementation

Declaration

Swift

func listMonitor(
    _ monitor: ListMonitor<ListEntityType>,
    didDeleteSection sectionInfo: NSFetchedResultsSectionInfo,
    fromSectionIndex sectionIndex: Int
)

Parameters

`monitor`	the `ListMonitor` monitoring the list being observed
`sectionInfo`	the `NSFetchedResultsSectionInfo` for the deleted section
`sectionIndex`	the previous section index for the deleted section