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* Implement ASCollectionGalleryLayoutDelegate - It arranges items of the same size into a multi-line stack (say photo gallery or pager). It takes advantage of the fact that its items always have a fixed size to measure as few items as possible while still being able to track their positions at all time. This helps reduce startup/reloadData time, as well as memory footprint. - It then uses a measure range, which also works as a allocate range, to figure out which items to measure ahead of time. And it guarantees that each item is scheduled to measure only once. - Lastly, ASCollectionLayoutDelegate has some new methods that allow delegates to hook up and stay ahead of layout attributes requests from the backing view. ASCollectionGalleryLayoutDelegate for example uses these methods to ensure elements that have their layout attributes requested are always ready for consumption, and to measure more elements in the background. * Handle items that span multiple pages and other improvements in gallery delegate * Minor fixes * Fix failing tests * Fix custom collection example * Implement missing method in gallery layout delegate * Fix warnings * Some improvements - Collection layout delegates must have a crollable directions property. - Simplify gallery delegate by not storing unmeasured attributes since calling measure on already measured elements should be cache hits and super fast. - Abstact some code in gallery delegate to ASCollectionLayoutState+Private and _ASCollectionGalleryLayoutItem. - Other improvements in gallery delegate * Fix file licenses * Move measure range logic to ASCollectionLayout * Track unmeasured elements * Remove pending layout in ASCollectionLayout * Get back pending layout because the timing to latch new data is not ideal * Add ASCollectionLayoutCache * Fix file licenses * Fix xcodeproj * Add async collection layout to examples/ASCollectionView * Measure method in ASCollectionLayout to be a class method * Encourage more immutable states - Make -calculateLayoutWithContext: to be class methods in ASDataControllerLayoutDelegate and ASCollectionLayoutDelegate. - Add layout delegate class and layout cache to ASCollectionLayoutContext+Private, to be use by ASCollectionLayout only. - ASDataController no longer allocates all nodes but lets ASCollectionLayout determine. - Add scrollableDirections to the layout context since it's often needed by the layout pass. Otherwise users have to wrap it in an info object. - Update built-in layout delegates and CustomCollectionView example. - Publish ASHashing. It might be helpful for clients that implement custom collection info objects. * Remove additionalInfo property in ASCollectionLayoutState * ASCollectionLayoutState to correctly filter unmeasured elements * Add ASHashing to umbrella header * Fix file licenses * Add ASDispatchAsync and use it in ASCollectionLayout * Improve code comment in ASCollectionLayoutState
Coming from AsyncDisplayKit? Learn more here
Installation
Texture is available via CocoaPods or Carthage. See our Installation guide for instructions.
Performance Gains
Texture's basic unit is the node. An ASDisplayNode is an abstraction over UIView, which in turn is an abstraction over CALayer. Unlike views, which can only be used on the main thread, nodes are thread-safe: you can instantiate and configure entire hierarchies of them in parallel on background threads.
To keep its user interface smooth and responsive, your app should render at 60 frames per second — the gold standard on iOS. This means the main thread has one-sixtieth of a second to push each frame. That's 16 milliseconds to execute all layout and drawing code! And because of system overhead, your code usually has less than ten milliseconds to run before it causes a frame drop.
Texture lets you move image decoding, text sizing and rendering, layout, and other expensive UI operations off the main thread, to keep the main thread available to respond to user interaction.
Advanced Developer Features
As the framework has grown, many features have been added that can save developers tons of time by eliminating common boilerplate style structures common in modern iOS apps. If you've ever dealt with cell reuse bugs, tried to performantly preload data for a page or scroll style interface or even just tried to keep your app from dropping too many frames you can benefit from integrating Texture.
Learn More
- Read the our Getting Started guide
- Get the sample projects
- Browse the API reference
Getting Help
We use Slack for real-time debugging, community updates, and general talk about Texture. Signup yourself or email textureframework@gmail.com to get an invite.
Contributing
We welcome any contributions. See the CONTRIBUTING file for how to get involved.
License
The Texture project was created by Pinterest as a continuation, under a different name and license, of the AsyncDisplayKit codebase originally developed by Facebook. AsyncDisplayKit was originally released by Facebook under a BSD license and additional patent grant. Those BSD and patent licenses govern use of code in Texture contributed prior to 4/13/2017 (the original AsyncDisplayKit code), and copies of the licenses are included in the root directory of this source tree for reference. All code contributed to Texture after 4/13/2017 is released by Pinterest under an Apache 2.0 license.