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76 lines
2.7 KiB
Markdown
76 lines
2.7 KiB
Markdown
---
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layout: page
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title: Smooth asynchronous user interfaces for iOS apps
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---
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AsyncDisplayKit is an iOS framework that keeps even the most complex user
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interfaces smooth and responsive. It was originally built to make Facebook's
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[Paper](https://facebook.com/paper) possible, and goes hand-in-hand with
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[pop](https://github.com/facebook/pop)'s physics-based animations — but
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it's just as powerful with UIKit Dynamics and conventional app designs.
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<br />
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### Quick start
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ASDK is available on [CocoaPods](http://cocoapods.org). Add the following to your Podfile:
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```ruby
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pod 'AsyncDisplayKit'
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```
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(ASDK can also be used as a regular static library: Copy the project to your
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codebase manually, adding `AsyncDisplayKit.xcodeproj` to your workspace. Add
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`libAsyncDisplayKit.a` to the "Link Binary With Libraries" build phase.
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Include `-lc++ -ObjC` in your project linker flags.)
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Import the framework header, or create an [Objective-C bridging
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header](https://developer.apple.com/library/ios/documentation/swift/conceptual/buildingcocoaapps/MixandMatch.html)
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if you're using Swift:
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```objective-c
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#import <AsyncDisplayKit/AsyncDisplayKit.h>
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```
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AsyncDisplayKit Nodes are a thread-safe abstraction layer over UIViews and
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CALayers:
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You can construct entire node hierarchies in parallel, or instantiate and size
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a single node on a background thread — for example, you could do
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something like this in a UIViewController:
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```objective-c
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dispatch_async(_backgroundQueue, ^{
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ASTextNode *node = [[ASTextNode alloc] init];
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node.attributedString = [[NSAttributedString alloc] initWithString:@"hello!"
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attributes:nil];
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[node measure:CGSizeMake(screenWidth, FLT_MAX)];
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node.frame = (CGRect){ CGPointZero, node.calculatedSize };
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// self.view isn't a node, so we can only use it on the main thread
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dispatch_sync(dispatch_get_main_queue(), ^{
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[self.view addSubview:node.view];
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});
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});
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```
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You can use `ASImageNode` and `ASTextNode` as drop-in replacements for
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UIImageView and UITextView, or [create your own
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nodes](https://github.com/facebook/AsyncDisplayKit/blob/master/AsyncDisplayKit/ASDisplayNode%2BSubclasses.h)
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to implement node hierarchies or custom drawing. `ASTableView` is a node-aware
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UITableView subclass that can asynchronously preload cell nodes without
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blocking the main thread.
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<br />
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### Learn more
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* Read the [Getting Started guide]({{ site.baseurl }}/guide)
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* Get the [sample projects](https://github.com/facebook/AsyncDisplayKit/tree/master/examples)
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* Browse the [API reference]({{ site.baseurl }}/appledoc)
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* Watch the [NSLondon talk](http://vimeo.com/103589245)
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