UICollectionViewUpdateItem Class Reference

Inherits from	NSObject
Conforms to	NSObject (NSObject)
Framework	/System/Library/Frameworks/UIKit.framework
Availability	Available in iOS 6.0 and later.
Declared in	UICollectionViewLayout.h

Overview

The UICollectionViewUpdateItem class describes a single change to make to an item in a collection view. You do not create instances of this class directly. When updating its content, the collection view object creates them and passes them to the layout object’s prepareForCollectionViewUpdates: method, which can use them to prepare the layout object for the upcoming changes.

This class is used to describe updates for cells, supplementary views, and decoration views. Use the elementKind property to determine the type of the item.

Tasks

Accessing the Item Type

Accessing the Item Changes

Properties

elementKind

The type of the item. (read-only)

@property (nonatomic, readonly) NSString *elementKind

Discussion

Cells have a type of UICollectionElementKindCell. Supplementary views have a type that is defined by the layout object that supports it.

indexPathAfterUpdate

The index path of the item after the update. (read-only)

@property (nonatomic, readonly) NSIndexPath *indexPathAfterUpdate

Availability

Available in iOS 6.0 and later.

Declared In

UICollectionViewLayout.h

indexPathBeforeUpdate

The index path of the item before the update. (read-only)

@property (nonatomic, readonly) NSIndexPath *indexPathBeforeUpdate

Availability

Available in iOS 6.0 and later.

Declared In

UICollectionViewLayout.h

updateAction

The action being performed on the item. (read-only)

@property (nonatomic, readonly) UICollectionUpdateAction updateAction

Discussion

For a list of relevant action types, see “UICollectionUpdateAction”.

Availability

Available in iOS 6.0 and later.

Declared In

UICollectionViewLayout.h

Constants

UICollectionUpdateAction

Constants indicating the type of action being performed on an item.

enum {
   UICollectionUpdateActionNone,
   UICollectionUpdateActionInsert,
   UICollectionUpdateActionDelete,
   UICollectionUpdateActionReload,
   UICollectionUpdateActionMove
};
typedef NSUInteger UICollectionUpdateAction;