5.2. Assigning a Data Source to a Collection View
You want to provide data to a collection view to render the data on the screen.
Assign a data source to the collection view using the
dataSource property of the
UICollectionView class. Your data source has to be an object that conforms to the
and it goes without saying that your data source object has to implement
required methods/properties of
The data source of the collection view, like that in table views,
is responsible for providing enough data to the collection view so that
it can render its contents on the screen. The way things are rendered on
the screen is
not the data source’s
job. That is the layout’s job. The cells that the layout displays on
your collection view will ultimately be provided by your collection
view’s data source.
Here are the required methods of the
UICollectionViewDataSource protocol that you
have to implement in your data source:
This method returns an
NSIntegerthat dictates to the collection view the number of items that should be rendered in the given section. The given section is passed to this method as an integer that represents the zero-based index of that section. This is the same in table views.
Your implementation of this method must return an instance of the
UICollectionViewCellthat represents the cell at a given index path. The