How do you add a UICollectionViewController to a UIScrollview within a UIViewController?

Question

I am trying to use this as a starting point to learn about collection view: Creating a UICollectionView programmatically

I have a viewDidLoad which has a UIScrollView created like so:

UIScrollView *scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0.0, 64.0, 

screenWidth, screenHeight)];

How do I add in the UICollectionViewController as the following below doesn't work:

ACollectionViewControllerr *vc = [[ACollectionViewController alloc] init];

[self.view addSubview:vc];

Do you need a UIScrollView to scroll down or does uicollectionview have that functionality already?

Answer 1

UICollectionView inherits from UIScrollView , so you don't need to add an UIScrollView . Just add the UICollectionView to the UIViewController directly.

If you use UICollectionViewController then you don't require UIViewController .

See the documentation of UICollectionView

Answer 2

You're trying to add a ViewController to a view, which will not work. Try the following instead:

ACollectionViewControllerr *vc = [[ACollectionViewController alloc] init];

[self.view addSubView:vc.view];
[vc didMoveToParentViewController];