UICollectionView cell sizes

Question

Stackoverflow question https://stackoverflow.com/a/13555814/1678391 was answered about setting variable sized cells in a UICollectionViewController. I'm trying to figure out how to do this with a UICollectionView object contained in a UIViewController. GetSizeForItem is what I need but don't see where to get it.

My implementation adds a UICollectionView to my UIViewController via Xcode. In my code I'm doing the following;

public partial class CustomViewController : UIViewController
{
    public override void ViewDidLoad()
    {
        collectionView.RegisterClassForCell(typeof(MyCell), cellId);
    }

    public override void ViewWillAppear(bool animated)
    {
        collectionView.Source = new CollectionViewSource(items, cellId);
    }

    class CollectionViewSource : UICollectionViewSource
    {
    }

    class MyCell : UICollectionViewCell
    {
    }
}

score 1 · Answer 1 · edited May 23 '17 at 10:31

1

According to http://docs.go-mono.com GetSizeForItem is available only for UICollectionViewDelegateFlowLayout class.

To use that method you should implement UICollectionViewDelegateFlowLayout subclass and assing it to Delegate property of UICollectionViewController. Example.

edited May 23 '17 at 10:31

Community

1
1

answered Mar 10 '13 at 07:52

Maxim Korobov

2,574
1
26
44

1

I'm not using a UICollectionViewController though. Just UICollectionView within a UIViewController. Is setting the size only possible if using UICollectionViewController? Thanks – Vincent Mar 11 '13 at 14:11
You can (http://stackoverflow.com/questions/14291889/how-can-we-use-uicollectionview-without-an-uicollectionviewcontroller). Try to set second parameter in `UICollectionView`'s constructor or set `UICollectionView`'s `CollectionViewLayout` property later. – Maxim Korobov Mar 11 '13 at 14:29
Can't seem to get the delegate subclass to be called. flowLayoutDelegate = new CollectionViewDelegateFlowLayout(); lineLayout = new CollectionViewFlowLayout(); collectionView.RegisterClassForCell(typeof(MyCell), CellId); collectionView.CollectionViewLayout = lineLayout; collectionView.Delegate = flowLayoutDelegate; – Vincent Mar 12 '13 at 20:55
You created basic `UICollectionViewDelegateFlowLayout` class, which is using default values. Instead, you should to subclass `UICollectionViewDelegateFlowLayout` and override `GetSizeForItem` method. – Maxim Korobov Mar 13 '13 at 08:02
For demo purpose, I forked oficial SimpleCollectionView demo project (https://github.com/xamarin/monotouch-samples/tree/master/SimpleCollectionView) and implemented subclass `UICollectionViewDelegateFlowLayout`. See `CustomFlowLayoutDelegate` class implementation and usage in demo at https://bitbucket.org/MaximKorobov/uicollectionviewdelegateflowlayout-demo – Maxim Korobov Mar 13 '13 at 08:03
My code above is a subclassed `UICollectionViewDelegateFlowLayout`. The sample you show above is based on a `UICollectionViewController`. Mine is based on a `UICollectionView`. I've downloaded and run your sample. The delegate stuff is basically what I'm doing. I've added a view to your sample with what I'm doing. I've placed it on dropbox at (https://www.dropbox.com/s/90isdyt9er438xa/CollectionViewSample.zip). – Vincent Mar 13 '13 at 18:44
I am having the same issue. Were you able to solve it without using the UICollectionViewController? – perfect_element Nov 23 '13 at 23:14

UICollectionView cell sizes

1 Answers1