Uicollectionview's Cell Disappearing

UICollectionView's cell disappearing

So, what did work?

1) Subclass UICollectionViewFlowLayout.

2) Set the flowLayout of my UICollectionView to my new subclass.

3) On the init method of the UICollectionViewFlowLayout subclass, set the orientation you want:

self.scrollDirection = UICollectionViewScrollDirectionHorizontal;

In my case it is Horizontal.

4) The important part:

-(BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds
{
   return YES;
}

At this moment, I should theorise a bit, but honestly I don't have a clue.

Why is text on a UICollectionViewCell disappearing when tapped on?

I would make sure the label is added to the contentView of the cell and not just the "top-most" view of the cell. Maybe the way the xib is setup is not right. Make sure it is UICollectionViewCell in the xib etc. You could also post pictures of how you have setup the xib.

Also, to debug, I would remove any code that deals with the cell that is not revolved around the label (for example, remove the animations until you fixed the bug). That will allow you to zone in on the issue. Or, another way, just begin from scratch and re-create the cell (with only the label). Getting a label to display is not rocket science, but you can make it rocket science if you do not build what is going on step-by-step.

Another potential issue is layout. Is the layout done right? And maybe it breaks (for some reason) when you highlight.

Cells disappearing with horizontal scrolling in UICollectionView

Silly, silly rookie mistake. Leaving this here if anyone else needs glasses like I do :)

The collection view did not have an horizontal constraint...

addSubview(gallery)
gallery.topAnchor.constraint(equalTo: label.bottomAnchor).isActive = true
gallery.bottomAnchor.constraint(equalTo: bottomAnchor).isActive = true

Correcting this to

addSubview(gallery)
gallery.topAnchor.constraint(equalTo: label.bottomAnchor).isActive = true
gallery.leftAnchor.constraint(equalTo: leftAnchor).isActive = true

fixed it (obviously).

Cell disappearing after scrolling 2 - 3 times in UICollectionView

Here I am answering my own question.

As I am stuck for the last 2 days on this issue.

As I am using CollectionViewController and add that Controller view into my current using controller so it's disappearing my collection view cell.

Reason: due to ARC releasing that delegate & datasource connection and that collection view can't able to get cell while I am
scrolling from top to bottom.

Solution:

I solve this problem in 2 ways.

1st : Create that CollectionViewController in my current VC not in Service & JSON Parser class due to delegate & datasource connection loss.

The most important part in the below code is addChildViewController by this it will not releasing delegate connection and works as expected.

UIStoryboard *mainStoryBoard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
CardListViewController *objCardListViewController = [mainStoryBoard instantiateViewControllerWithIdentifier:@"CardListViewController"];
objCardListViewController.view.frame = CGRectMake(0, 0,self.cardMainView.frame.size.width, self.cardMainView.frame.size.height);
[self.cardMainView addSubview:objCardListViewController.view];
[self addChildViewController:objCardListViewController];

but as per my requirement I needed this collection view at many places
so I need to generalize this collection view.

So I choose the 2nd way which is ContainerView with add child controller and I connect this CollectionViewController with container view so I can use it as many places where I need this list.

Strange but true.

Hope this will help someone if facing the same issue.

Thanks & Happy Coding.

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