IGListScrollDelegate

Objective-C

@protocol IGListScrollDelegate <NSObject>

Swift

protocol ListScrollDelegate : NSObjectProtocol

Implement this protocol to receive display events for a section controller when it is on screen.


                    
                    
                    -listAdapter:didScrollSectionController:

Tells the delegate that the section controller was scrolled on screen.

Declaration

Objective-C

- (void)listAdapter:(nonnull IGListAdapter *)listAdapter
    didScrollSectionController:
        (nonnull IGListSectionController *)sectionController;

Swift

func listAdapter(_ listAdapter: IGListAdapter, didScroll sectionController: IGListSectionController)

Parameters

`listAdapter`	The list adapter whose collection view was scrolled.
`sectionController`	The visible section controller that was scrolled.


                    
                    
                    -listAdapter:willBeginDraggingSectionController:

Tells the delegate that the section controller will be dragged on screen.

Declaration

Objective-C

- (void)listAdapter:(nonnull IGListAdapter *)listAdapter
    willBeginDraggingSectionController:
        (nonnull IGListSectionController *)sectionController;

Swift

func listAdapter(_ listAdapter: IGListAdapter, willBeginDragging sectionController: IGListSectionController)

Parameters

`listAdapter`	The list adapter whose collection view will drag.
`sectionController`	The visible section controller that will drag.


                    
                    
                    -listAdapter:didEndDraggingSectionController:willDecelerate:

Tells the delegate that the section controller did end dragging on screen.

Declaration

Objective-C

- (void)listAdapter:(nonnull IGListAdapter *)listAdapter
    didEndDraggingSectionController:
        (nonnull IGListSectionController *)sectionController
                     willDecelerate:(BOOL)decelerate;

Swift

func listAdapter(_ listAdapter: IGListAdapter, didEndDragging sectionController: IGListSectionController, willDecelerate decelerate: Bool)

Parameters

`listAdapter`	The list adapter whose collection view ended dragging.
`sectionController`	The visible section controller that ended dragging.
`decelerate`	‘Yes’ if the scrolling movement will continue, but decelerate, after a touch-up gesture during a dragging operation. If the value is ‘No’, scrolling stops immediately upon touch-up.


                    
                    
                    -listAdapter:didEndDeceleratingSectionController:

Tells the delegate that the section controller did end decelerating on screen.

Note

This method is @optional until the next breaking-change release.

Declaration

Objective-C

- (void)listAdapter:(nonnull IGListAdapter *)listAdapter
    didEndDeceleratingSectionController:
        (nonnull IGListSectionController *)sectionController;

Swift

optional func listAdapter(_ listAdapter: IGListAdapter, didEndDeceleratingSectionController sectionController: IGListSectionController)

Parameters

`listAdapter`	The list adapter whose collection view ended decelerating.
`sectionController`	The visible section controller that ended decelerating.