I'm playing around with UICollectionView interactive transitions.
The very basic implementation is here.
Now I'm a bit stuck with Cells transitioning.
The idea is to change content of cells simultaneously with interactive layout transition.
Here is how it looks now.
The first layout
And the second layout
When transitioning is finished, I want to change content of cells on second layout.
1) Text label "Some label" should disappear from every cells
2) Text label "Another label" should appear on the right corner of each cell.
Key issue is I want this changes fade in/out according to UICollectionViewTransitionLayout.transitionProgress value during transitioning.
Something very similar implemented in Facebook Paper App.
Take look how content of cells is changing below (click on it).
Is anybody know an elegant way to replicate this effect?
This library will help you achieve what you are trying. If you are interested in custom animations I would suggest you use FB pop library
Well.
The solution is to subclass UICollectionViewCell.
Subclass should contain two UIView. One for big layout & one for small.
Initially UICollectionViewCell shows only small one.
Once we starting to update UICollectionViewTransitionLayout.transitionProgress for example from small to big we should do following steps:
Make an UIImage from big UIView
Put this image above small UIView
Set alpha of the image to 0
Continuously change alpha of UIImage to UICollectionViewTransitionLayout.transitionProgress value
Once transition is done just switch this to UIView
When you transitioning back you should switch big with small.
Done :-)
Related
I have an iPad app similar to the iPad Keynote with a narrow overview on the left and a paged UICollectionView of my "slides" on the right. The collection view is using the default FlowLayout. Some of these slides are standard PDFs and some are embedded UIViewControllers that have been scaled (with a CGAffineTransform) and embedded in the cell. I'd like to smoothly animate the overview sidebar offscreen and zoom the current page cell to fullscreen. The collection view should allow paged swiping at whatever size. I'm using storyboards and autolayout.
I think I need to simultaneously animate about three things:
The collection view constraints (to the sidebar) to enlarge/shrink it
The flow layout's sizeForItemAt: value
The CGAffineTransform on the embedded view controller.
I have some pieces working (a single embedded View Controller "slide" that scales correctly) but cannot get the collectionView/cell resize dance to work correctly. The cell resize animation is jerky, or ends up with the wrong offset, or works for the leftmost cell but not for other cells.
I've tried most of the suggestions in the answers to this question but with no convincing success. I can't believe it's impossible but at this point I'm considering the smoke and mirrors approach of animating a static slide and hiding it after the animation completes. The attached video - ignoring the glitches - illustrates the kind of effect I'm after:
It's worth noting, on close inspection, that Keynote cheats somewhat when it comes to swiping between slides in edit mode, and manually manages the next slide sliding onscreen, so probably doesn't use a UICollectionView.
Has anyone done anything similar, or have any suggestions for things to try?
I managed to solve this. There's a proof-of-concept GitHub repo here.
There are a few moving parts:
There are two pieces of UIView scaling code. I suspect these could be combined with suitable delegate references as the nested view controllers are embedded. The first piece scales (statically) correctly when the Collection View cell is created. The second is an animated scale/translate when the sidebar size is changed.
I added a FlowLayout subclass to remove flicker as the collection's layout is invalidated during scaling.
The sidebar-related transform in the top-level VC uses most of the tricks in the book - invalidateLayout(), performBatchUpdates(...), layoutIfNeeded() etc. as well as animating the contentOffset to the correct value. Some manual tracking of the correct page/slide is required.
There's still a slight flicker occasionally at the start of resizing. This may not be an issue with my particular colour-scheme which will be black on dark gray. Bonus points if anyone can suggest how to track this down or alleviate it.
I have requirement like below and I went already with couple of animations but it didn't worked me at all..
please see the image what I want to achieve this kind of animation. I also want centered collectionview cells in which one cell from left and right will appear. This works but not in the full size of screen right now.
Thanks for any help.
This is good reference.
You have 2 options,
Use UIView animation, i.e. Scale, Center etc.
Use UIViewController custom transition
On click of you collectionview's cell you need to show UIView or UIViewController with custom transition.
This is end end result I want:
And this is the thing I tried initially.
This does not work, the cells below/above the cell with the background will overlap or underlap the background depending on when they are added into the tableview (like via dequeue/scrolling).
I am quite OK with this not working, and I believe I can achieve it by other means. For example by adding these backgrounds as views within the tableview itself and moving them based on the content offset or similar ways, maybe adding a background image that is tall with them embedded.
But. I am curious if there are some easier way, just adding the view into the XIB and applying a rotation would be very nice.
The background should be below the text in the other cells as well - this is where the complications comes in.
Anyway. Is this possible in some super-neat way?
What you should do is setting all cell's background to clear, and to set a background to your UITableView or your UIView.
Or, as you suggest, you can add a UIView with a rotation applied, and add it as a subview of your UIView/UITableView, and send it to back with [self.view sendSubviewToBack:backgroundView].
I'm trying to recreate the passbook UI using a collection view with a custom layout.
So far so good, but there's this thing I can't seem to find a solution for.
Problem: When I click on a cell I want it to move up to the top of the screen (content offset of the cv). Most of the cells don't have a problem with this and they perform as such. However, when the selected cell is near the bottom of the screen, there's no moving at all... just a fade-out and fade-in.
To achieve this animation, I embedded the layout subclass' invalidateLayout in an animation block to be performed by UIView. No matter how high or low I set the time interval, the duration is still the same, and so no effect on the fade-in fade-out behaviour.
I'll paste here the methods that I believe to need to be modified and also a link to a video on youtube. Hopefully, someone can find a solution for this >_<".
YT: https://www.youtube.com/watch?v=3xIL-fFUcJo
Code: http://pastebin.com/QKLKGwdN
I have a simple app that has a set of coloured views, one red, one green and one blue.
I am trying to make it so that when a swipe gesture is made the current view will switch to the next one in the list in a fluid manner, it looks like moving a long piece of paper with different colours on it.
Is there a way to do this (CoreAnimation)?
You could first look into UIScrollView. It seems to me that what you are trying to accomplish is the same you have, say, in Mobile Safari on an iPhone, when you show all your current pages and can go from one to the next by scrolling. This tutorial is particularly close to what you describe.
If you are looking into more advanced kind of transformations, than Core Animation would be the option.
Actually, nothing prevents using both approaches, UIScrollView to handle the swipe, Core Animation to add more animation to the pack...
You could use a UIScrollView to accomplish this. Add all of your colored views as subviews to the scroll view. Make sure your contentSize is setup appropriately and optionally setup paging to make the scrolling always snap to a certain border. See the scroll view programming guide for more info Scroll View Programming Guide