Cell disappearing after scrolling 2 - 3 times in UICollectionView

问题

I'm facing a strange issue while scrolling my UICollectionView. It's showing a blank view without any cells in it.

It strangely hides my cell or removes my cell, I don't know, but I'm unable to find any solution.

I have tried these solutions from SO:

1st : Tried to create custom class of UICollectionViewFlowLayout and do as directed with all different methods but unable to solve my issue.

2nd : Tried below method to reattribute and recalculate my cell size :

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

Links I followed :

Que1: UICollectionView's cell disappearing

Que2: UICollectionView items disappear when scrolling with my own UICollectionViewFlowLayout subclass

Please guide me whats wrong with simple collectionview with custom cell.

Reference Image :

Before Scroll:

After Scroll:

回答1:

Here I am answering my own question.

As I am stuck since last 2 days for this issue hope some one get help if any one get same issue like me.

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

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

Solution:

I solve this problem by 2 ways.

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

Most Important part in 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 go for 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 same issue.

Thanks & Happy Coding.

来源：https://stackoverflow.com/questions/41592580/cell-disappearing-after-scrolling-2-3-times-in-uicollectionview

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ios