UICollectionView Layout Issue

Question

I am using UICollectionView using the flow layout. I have made a custom UICollectionViewCell for the same. But on running the project the console keeps on throwing this error-

The behavior of the UICollectionViewFlowLayout is not defined because: the item height must be less that the height of the UICollectionView minus the section insets top and bottom values.

I have made sure that the size of the cell is correct

Has anyone been able to resolve this issue.

Please add some information about flowLayout.itemSize, collectionView.fram! Crash when rotate or viewDidLoad? — Alex
– Alex, Commented Apr 15, 2013 at 10:46
I have found out that this error comes only when i select the Scroll direction as horizontal. — Nitesh
– Nitesh, Commented Apr 15, 2013 at 10:46
It does not crash just the UI goes blank. This is the size of the cell. 300X460 Collection View frame- 300X480 Layout Frame-300X480 I have taken all these values from the xib I want the Collection view to scroll horizontally not vertically. — Nitesh
– Nitesh, Commented Apr 15, 2013 at 10:47
itemSize > CollecitonView.frame(height or width), check your itemSize and collecitonView.frame. — Alex
– Alex, Commented Apr 15, 2013 at 10:50
Is it because i have set the Scrolling as Horizontal? Cuz it seems to work fine in vertical scrolling — Nitesh
– Nitesh, Commented Apr 15, 2013 at 10:55

Connor Wagner · Accepted Answer · 2014-01-11 02:27:24Z

I found that, using storyboards, you have to go into the storyboard and click on the overall View Controller (the view should be highlighted in blue) and go to the Attributes Inspector (the fourth tab on the right side of the screen) and unchecking the "Under Top Bars", "Under Bottom Bars", and "Under Opaque Bars." This cleared up the issue for me, and it cleared it for my coworkers as well.

I found that unchecking "Adjust Scroll View Insets" removed the warning. (using Storyboards, Autolayout in cells)
Worked for me: programmatically added collectionView on a storyboard based uiView.

iwasrobbed · Accepted Answer · 2016-09-27 20:39:46Z

I've been having some issues when the using a collection view to present full screen view controllers.

Basically at run time, it'll ask for the size of the item and simply return the size of the collection view:

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { return self.collectionView.frame.size; }

This is better than my answer if you want to support rotation

Adrian · Accepted Answer · 2018-03-09 14:26:31Z

I know this is a very late reply, but I have also experienced this.

Inside my view controller, let's call it MyViewController I have a UICollectionView that is using custom UICollectionViewCells. I'm implementing the method collectionView:layout:sizeForItemAtIndexPath where I am returning a item size that is dependent on the height of the UICollectionView.

MyViewController is made in a storyboard using autolayout to control the height of the UIViewController.

The cells look fine when in portrait mode, but did not when in landscape mode.

I solved my issues by invalidating the UICollectionViewLayout of my UICollectionView inside the viewWillLayoutSubviews method.

- (void)viewWillLayoutSubviews { [self.myCollectionView.collectionViewLayout invalidateLayout]; }

Earlier I had tried to invalidate the layout inside willAnimateRotationToInterfaceOrientation:duration, but it didn't work. The reason for this is probably that the sizes for all the views are not calculated yet, so we have to wait until autolayout has finished its magic. I refer to this SO thread.

Update for Swift 4.0:

 override func viewDidLayoutSubviews() { super.viewDidLayoutSubviews() self.myCollectionView.collectionViewLayout.invalidateLayout() }

thank you! after hours of trying different suggestions this simple solution eliminated my layout warnings.
This worked for me on a collectionView inside a UIView. Been at this for hours and this is the only thing that worked! I just overrode the layoutSubviews method.

Jonathan Crooke · Accepted Answer · 2013-04-16 19:27:06Z

Had this issue myself a few times when trying to create collection views with fullscreen cells. My problem was caused by laying out for 4" screen in IB/Storyboard and specifying 320*568 for item size, but running in the simulator using 3.5" screen, which has a height of 480. The solution is to specify your item size in code with something like:

UICollectionViewFlowLayout *layout = (id) self.collectionView.collectionViewLayout; layout.itemSize = self.collectionView.frame.size;

This ensures that the cell size is set correctly at runtime.

Why do you assign size of entire view to size of single cell ?
I encountered this issue with full-screen cells. Not sure if the OP is doing the same, but this is the most obvious way that you would experience this issue.

DarkoM · Accepted Answer · 2014-06-04 13:56:23Z

If you are using storyboards and auto layout, debugging this kind of problems is really hard...

I had similar problem when trying to display UICollectionViewCell fullscreen on iPhone.

Most of the time issue is with the size of the cell set in

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)

or directly on flowLayout.itemSize.

But... try:

Select the ViewController:

Selecting View Controller

Then uncheck Extend Edges options:

Disable Extend Edges Options

And now try setting your auto layout constraints.

Good luck.

Nike Kov · Accepted Answer · 2016-03-02 16:11:19Z

That fixed my problem:

-(CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath { return CGSizeMake(self.collectionView.frame.size.width, self.collectionView.frame.size.height - 70); }

U can see padding value from top and bottom on this screen:

Oleg Prymak · Accepted Answer · 2013-07-22 16:51:42Z

2

Be sure to set the right autoresizing mask for UICollectionView and UICollectionviewcell. This fixed my problem for iPhone 4 Simulator

answered Jul 22, 2013 at 16:51

Oleg Prymak

212 bronze badges

1 Comment

Arie Litovsky Over a year ago

Also, setting up the autoresizing mask on the cell's contentView (or a UITableViewCell's content view) can help

Dave Levy · Accepted Answer · 2015-12-22 00:18:48Z

For me I am using AKPickerView inside of a custom UIView which was giving me a slew of warnings like the ones mentioned here. All I did to eliminate the warnings was to Un-Check the box called 'AutoResize Subviews' in the Attributes Inspector for my custom UIView. That silenced the warnings so hard, I thought my logger stopped working.

spogebob92 · Accepted Answer · 2018-05-19 21:50:55Z

2

What caused this for me was that I was trying to set my cells to the size of the superview rather than the size of the UICollectionView. Simply replaced the superview frame with the UICollectionView frame.

answered May 19, 2018 at 21:50

spogebob92

1,4744 gold badges23 silver badges33 bronze badges

1 Comment

Richard Mao Over a year ago

i was using CGSize(width: view.frame.width, height:view.frame.height ) as collectionview cell size , i changed to CGSize(width: collectionView.frame.width, height: collectionView.frame.height ) , then everything is okay now . (I put a collectiomview inside another collectionview cell )

Vlad Antonov · Accepted Answer · 2021-10-29 10:30:38Z

I had this problem when I was need full screen cells in collectionView. So I resolved it with this decision.

Cell size is equal collection view size

2. Change in storyboard "Inset from:" from Safe Area to Content Inset

Change "Content Insets" to Never

SeanT · Accepted Answer · 2015-03-13 19:01:20Z

I just ran into the same error message, but for me the issue was that when I received new data from the api and tried to refresh my collectionView, the method that called [collectionView reloadData] wasn't calling it on the main thread.

Hope this helps someone...

Mahesh Kumar · Accepted Answer · 2015-06-12 13:09:18Z

I have same issue

the behavior of the UICollectionViewFlowLayout is not defined because: the item height must be less than the height of the UICollectionView minus the section insets top and bottom values.

I solved this issue by checking the values in section Insets.And for fix cell size I have used below code.

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{ CGSize result = [[UIScreen mainScreen] bounds].size; CGFloat scale = [UIScreen mainScreen].scale; result = CGSizeMake(result.width * scale, result.height * scale); CGFloat cellWidth = [[UIScreen mainScreen] bounds].size.width - 20; CGFloat cellHeight = [[UIScreen mainScreen] bounds].size.height - 120; return CGSizeMake(cellWidth, cellHeight); }

the_dude_abides · Accepted Answer · 2016-09-21 21:04:32Z

If you're loading a collectionView via a container view + UICollectionViewController, you may have set a height constraint on the container view which is constraining the height of the collection view itself. In my case, I found the collectionView.contentSize was taller than the constraint I had set on my container view.

Obviously this is a bit of an edge case but just in case you have a similar setup, I figured I'd add this comment.

John Scalo · Accepted Answer · 2020-04-30 15:53:58Z

For me the solution was to set Estimate Size (in the storyboard size attributes pane) for the collection view to None.

Tilo Delau · Accepted Answer · 2020-12-02 16:39:19Z

It's complaining that the item height is bigger than the height of the collectionView. So it's sticking out. So you have to make the height the same or less. Like this:

 func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { return CGSize(width: collectionView.frame.height, height: collectionView.frame.height) }

Using the height for the width makes it a square. This is assuming inset is 0 which it should be if you haven't done anything.

Gal Blank · Accepted Answer · 2015-01-08 17:07:41Z

None of the above fixes did it for me. I fixed it with this

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {CGFloat currentWidth = collectionView.frame.size.width; UIEdgeInsets sectionInset = [(UICollectionViewFlowLayout *)collectionView.collectionViewLayout sectionInset]; //here the sectionInsets are always = 0 because of a timing issue so you need to force set width of an item a few pixels less than the width of the collectionView. CGFloat width = currentWidth - 10; }

This seems to be incomplete code. Where is return statement? Is it just CGSize(width, collectionView.frame.size.height) or have you changed it?

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