Collection View (Uicollectionview)

Four components of a collection view:

Cell: It is a cell in the collection view.

Section: It is a row of data in a collection view, consisting of multiple cells

Supplemental View: It is the head and feet of a section

Decorative view: A background image in a collection view.

Uicollectionview inherits from Uiscrollview. There are two protocols: Uicollectionviewdelegate Trust protocol and Uicollectionviewdatasource data source protocol.

Uicollectionviewcell is a cell class, and its layout is defined by the Uicollectionviewlayout class, which is an abstract class. The Uicollectionviewflowlayout class is a subclass of the Uicollectionviewlayout class. For complex layouts, you can customize the Uicollectionviewlayout class. The Uicollectionview for the controller is the Uicollectionviewcontroller class.

There are four methods in the Uicollectionviewdatasource:

-(Nsinteger) CollectionView: (Uicollectionview *) CollectionView numberofitemsinsection: (NSInteger) Section; Provide the number of columns in a section

-(Uicollectionviewcell *) CollectionView: (Uicollectionview *) CollectionView Cellforitematindexpath: (NSIndexPath *) Indexpath; provide display data for a cell

-(Nsinteger) Numberofsectionsincollectionview: (Uicollectionview *) CollectionView; provides the number of sections in a view

-(Uicollectionreusableview *) CollectionView: (Uicollectionview *) CollectionView Viewforsupplementaryelementofkind :(NSString *) kind Atindexpath: (Nsindexpath *) Indexpath; I supplemental view provides display data

The more important methods in Uicollectionviewdelegate are:

-(void) CollectionView: (Uicollectionview *) CollectionView Didselectitematindexpath: (Nsindexpath *) IndexPath; Trigger after selecting a cell

-(void) CollectionView: (Uicollectionview *) CollectionView Diddeselectitematindexpath: (Nsindexpath *) IndexPath; Triggers after the cell is not selected.

Collection View (Uicollectionview)