CollectionView layout gets mad after scrolling

Question

Created Nov ’19

Replies 6

Boosts 0

Views 11k

Participants 4

Hi, I'm setting a collection View in order to display content as instagram Profile view with all the photos in the grid.

in order to set the layout I'm using some delegate methods of UIcollectionviewDelegateFlowLayout . When you open the project, the collectionView works well with the grid set well. The problem occurs when you scroll down very fast the collectionView so that you make momentaneously disappear all the cells. In that exact moment all the cell layout I've set before doesn't hold and the images become ultra zoomed and one on top of each other.

I don't know how to fix this issue.

Also in the compiler I get this error :

the item width must be less than the width of the UICollectionView minus the section insets left and right values, minus the content insets left and right values.

Please check the values returned by the delegate.

The relevant UICollectionViewFlowLayout instance is <UICollectionViewFlowLayout: 0x7fbbe972d1f0>, and it is attached to <UICollectionView: 0x7fbbeb056400; frame = (0 0; 414 896); clipsToBounds = YES; autoresize = RM+BM; gestureRecognizers = <NSArray: 0x60000203c4e0>; layer = <CALayer: 0x600002ef19c0>; contentOffset: {0, 424}; contentSize: {414, 16048}; adjustedContentInset: {88, 0, 83, 0}; layout: <UICollectionViewFlowLayout: 0x7fbbe972d1f0>; dataSource: <InstagramClone.ProfileViewController: 0x7fbbe9708890>>.

Answered by guala in 396964022

Actually I discovered that with Swift 4 UICollectionViewCells have difficulties in autoresizing themselves, so in this case you have to go in the size inspector and set Estimated Size to "none". After doing this everything works correctly

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Answer 1

Claude31 OP

Nov ’19

Please show the code of all the collection view delegate functions.

Hard to say without.

However, have a look here

https://stackoverflow.com/questions/32082726/the-behavior-of-the-uicollectionviewflowlayout-is-not-defined-because-the-cell

and try overriding the

shouldInvalidateLayoutForBoundsChange

function to return true

Try also adding:

flowLayout.estimatedItemSize = CGSize(width: 1, height: 1)

0

Answer 2

guala OP

Nov ’19

Thanks so much for adding the suggestions!

0

Answer 3

Claude31 OP

Nov ’19

Does it work now ?

If so, great. And don't forget to close the thread.

0

Answer 4

guala OP

Dec ’19

Accepted Answer

Actually I discovered that with Swift 4 UICollectionViewCells have difficulties in autoresizing themselves, so in this case you have to go in the size inspector and set Estimated Size to "none". After doing this everything works correctly

6

Answer 5

wpollock OP

Mar ’20

Thank you!!

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Answer 6

Mrwhononumber OP

Oct ’21

Thanks!

0