IGListCollectionView

Objective-C


@interface IGListCollectionView : UICollectionView

Swift

class ListCollectionView : UICollectionView

This UICollectionView subclass allows for partial layout invalidation using IGListCollectionViewLayout, or custom layout classes that conform to IGListCollectionViewLayoutCompatible.

Note

When updating a collection view (ex: calling -insertSections), -invalidateLayoutWithContext gets called on the layout object. However, the invalidation context doesn’t provide details on which index paths are being modified, which typically forces a full layout re-calculation. IGListCollectionView gives IGListCollectionViewLayout the missing information to re-calculate only the modified layout attributes.


                    
                    
                    -initWithFrame:listCollectionViewLayout:

Create a new view with an IGListcollectionViewLayout class or subclass.

Note

You can initialize a new view with a base layout by simply calling -[IGListCollectionView initWithFrame:].

Declaration

Objective-C

- (nonnull instancetype)
               initWithFrame:(CGRect)frame
    listCollectionViewLayout:
        (nonnull UICollectionViewLayout<IGListCollectionViewLayoutCompatible> *)
            collectionViewLayout;

Swift

init(frame: CGRect, listCollectionViewLayout collectionViewLayout: any UICollectionViewLayout & IGListCollectionViewLayoutCompatible)

Parameters

`frame`	The frame to initialize with.
`collectionViewLayout`	The layout to use with the collection view. You can use IGListCollectionViewLayout here, or a custom layout class that conforms to IGListCollectionViewLayoutCompatible.