apple.uikit.protocol

Interface UIDataSourceTranslating

All Known Implementing Classes:

UICollectionView, UITableView

public interface UIDataSourceTranslating

For advanced clients with data model centric layouts (i.e. the layout refers to the data source to gather information in order to create UICollectionViewLayoutAttributes) this protocol allows translation between the data source index path into the presentation index path (i.e. layout) state.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	UIDataSourceTranslating.Block_performUsingPresentationValues

Method Summary

Modifier and Type	Method and Description
NSIndexPath	dataSourceIndexPathForPresentationIndexPath(NSIndexPath presentationIndexPath) Translate (if needed) a Presentation index path to the Data Source index path.
long	dataSourceSectionIndexForPresentationSectionIndex(long presentationSectionIndex) Translate (if needed) a Presentation section index to its Data Source section index value.
void	performUsingPresentationValues(UIDataSourceTranslating.Block_performUsingPresentationValues actionsToTranslate) Arguments passed to actions performed inside the scope of this block will be interpreted as values in the presentation state, and the values returned from these actions will also be in the presentation state.
NSIndexPath	presentationIndexPathForDataSourceIndexPath(NSIndexPath dataSourceIndexPath) Translate (if needed) a Data Source index path to the Presentation index path.
long	presentationSectionIndexForDataSourceSectionIndex(long dataSourceSectionIndex) Translate (if needed) a Data Source section index to its Presentation section index value.

Method Detail

dataSourceIndexPathForPresentationIndexPath

NSIndexPath dataSourceIndexPathForPresentationIndexPath(NSIndexPath presentationIndexPath)

Translate (if needed) a Presentation index path to the Data Source index path. If the item was inserted at the index path, this will return nil. If no effective change took place, will return passed value.

dataSourceSectionIndexForPresentationSectionIndex

long dataSourceSectionIndexForPresentationSectionIndex(long presentationSectionIndex)

Translate (if needed) a Presentation section index to its Data Source section index value. If section was inserted and not known the Data Source, this will return NSNotFound. If no effective change took place, will return passed value.

performUsingPresentationValues

void performUsingPresentationValues(UIDataSourceTranslating.Block_performUsingPresentationValues actionsToTranslate)

Arguments passed to actions performed inside the scope of this block will be interpreted as values in the presentation state, and the values returned from these actions will also be in the presentation state.

presentationIndexPathForDataSourceIndexPath

NSIndexPath presentationIndexPathForDataSourceIndexPath(NSIndexPath dataSourceIndexPath)

Translate (if needed) a Data Source index path to the Presentation index path. If the item was deleted at the index path, this will return nil. If no effective change took place, will return passed value.

presentationSectionIndexForDataSourceSectionIndex

long presentationSectionIndexForDataSourceSectionIndex(long dataSourceSectionIndex)

Translate (if needed) a Data Source section index to its Presentation section index value. If section was deleted during a transaction, this will return NSNotFound. If no effective change took place, will return passed value.