BouncyLayout is a collection view layout that makes your cells bounce.

This is my podfile look like

use_frameworks!
pod 'BouncyLayout'

when i install my pod it throws error like:

Analyzing dependencies
[!] Unable to find a specification for `BouncyLayout`

Hi, nice layout !

I have an issue with the example on my iPhone SE and the grid exemple. In random scroll position cell start to make small circle animations on themselves often by group.

PS : I don't know how to provide you a gif of it I'd be glad to learn :) so you'll get a video bugPhotoCell.mov.zip

when the method insertItemsAtIndexPaths: is executed，the program crashes and prints the log: no UICollectionViewLayoutAttributes instance for -layoutAttributesForItemAtIndexPath:

I'm using BouncyLayout horizontally, and find that the spacing between each cell compresses far too much, causing an overlap.

Is there a way to avoid compression altogether and have the cells kind of bump of against each other?

Hi there, good job on this project, it looks really cool and I am looking forward to using it.

I tried to use it with my collection view in which I’m using self-sizing cells, simply droppping in BouncyLayout() in place of the existing UICollectionViewFlowLayout(), and setting a random .estimatedItemSize before assigning it to the collection view. The self-sizing behaviour doesn’t remain, however, and the cells all get resized to a fixed size.

My project is currently in a haphazard state so I can’t upload the code; however I’m using IGListKit and was able to reproduce this effect with their provided self-sizing cells example.

Do you plan on adding support for self-sizing cells to BouncyLayout? The Instagram people themselves had a bunch of issues with implementing it, so I would understand if you don’t plan on doing so; their codebase would be a great help if you did, however.

Thanks!

I'd like to do some initial display animations through override func initialLayoutAttributesForAppearingItem but can't subclass when importing as an external framework (Carthage)

Optimized oldBehaviors(for:), newBehaviors(for:) and shouldInvalidateLayout(forBoundsChange:)

While chaining multiple map, flatMap and filter calls makes the code very readable, a class that is meant to be used as a library should strive for performance. I have taken the liberty to optimise the aforementioned methods so they don't perform superfluous full passes over collections.

Also, now shouldInvalidateLayout(forBoundsChange:) returns the result of comparing the current bounds.width with the newBounds.width, so the layout can adapt to interface orientation or size class changes.

• Reduced number of iterations required to prepare layout
• Cache visible indices
• Cache visible cell CGSizes
• Update UIDynamicAnimator on cell size change
• Cleanup private methods and stop leakage of utils
• Remove redundant layout invalidations

Your lib is so cool :)) I'm making a chat app and i dont know how to make cell message auto dimension (like tableview) with bouncy. Does you lib support or how i can archive that? Thank you!

Hi @roberthein, I really love BouncyLayout and have used it for a few of my collection views so far which has worked well. However, I have three UITableViews which should stay tableviews due to some autoresizing issues with UICollectionView even a colleague of mine who is quite experienced at coding was not able to solve. Therefore, I was wondering whether there was a way to use this library on a tableview as I couldn't figure one out. Would really appreciate your help! blurtime

There are so many things that don't work with this library.

• UICollectionReusableViews
• HeaderReferenceSize isn't respected.
• Bounce animations on simulator are completely off. (most like apple issue. works on device).
• CollectionViewHeaders just vanish out of thin air
• CollectionViewHeaders height are adjusted incorrectly on scroll.
• Imageviews in cells just disappear on touch.

The list goes on.

I really like this lib, and I want to use it in my chat app. But it is a macOS app, so I want to know, are there any plans on supporting macOS in the future?

Hi! Great library :)

Not sure if this is iPad specific, but when the UITraitCollection is changed (e.g. display is rotated, OR if you adjust the size of the app in SplitView to name a couple of ways), it throws off the UICollectionView and requires you to scroll down and then back up to have it reload those rows.

Any advice would be appreciated! 😄

it works good when collectionView has no header or footer. but will missing cell or some other display trouble when I added it a header or footer in each section. wish you answer! thanks.

I have a view that has rotated cells, simulating cards played out. the cells are rotated randomly:

if rotateCells {
            let randomInt = Int.random(in: -17..<18)
            cell.rotate(degrees: CGFloat(randomInt))        
}

When adding BouncyLayout - the cells don't maintain their rotation. I believe this is a bug...