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Initial attempt at implementing Display Traits

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Initial attempt to get display traits working with ASEnvironment.

To get proper ASDisplayTraits support, you must use an ASViewController. The ASViewController implements UITraitCollection-related methods (`traitCollectionDidChange:`, `willTransitionToTraitCollection:withTransitionCoordinator:`, viewWillTransitionToSize:withTransitionCoordinator`) to update the internal ASDisplayTraits and propagate them to subnodes.

ASTableNode and ASCollectionNode don't actually have their cells as subnodes, so a little bit of trickery is involved (on `setEnvironment:` the table/collection node gets its data controllers completedNodes and propagates the new traits. see `ASDisplayTraitsCollectionTableSetEnvironmentState`). The data controller also passes the current display traits when creating new cells.

ASViewController also supports the ability to return a custom set of display traits. So if you have a modal dialog that should always be told it is in a compact size class, you can set the override block before displaying the VC.

A new example, called Display Traits, has been added. It shows how display traits can be used in a ASViewController with a normal ASDisplayNode as its root, as well as in ASViewControllers hosting table nodes and collection nodes. There is also an example of overriding the default display traits of a VC.

Please provide feedback!
This commit is contained in:
rcancro
2016-04-25 16:59:00 -07:00
parent 495f32f0ef
commit 8bb4eba080
37 changed files with 1535 additions and 68 deletions
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15
AsyncDisplayKit/ASViewController.h
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@@ -11,12 +11,27 @@
NS_ASSUME_NONNULL_BEGIN
typedef ASDisplayTraits (^ASDisplayTraitsForTraitCollectionBlock)(UITraitCollection *traitCollection);
typedef ASDisplayTraits (^ASDisplayTraitsForTraitWindowSizeBlock)(CGSize windowSize);
@interface ASViewController<__covariant DisplayNodeType : ASDisplayNode *> : UIViewController
- (instancetype)initWithNode:(DisplayNodeType)node NS_DESIGNATED_INITIALIZER;
@property (nonatomic, strong, readonly) DisplayNodeType node;
@property (nonatomic, strong) id displayTraitsContext;
/**
* Set this block to customize the ASDisplayTraits returned when the VC transitions to the given traitCollection.
*/
@property (nonatomic, copy) ASDisplayTraitsForTraitCollectionBlock overrideDisplayTraitsWithTraitCollection;
/**
* Set this block to customize the ASDisplayTraits returned when the VC transitions to the given window size.
*/
@property (nonatomic, copy) ASDisplayTraitsForTraitWindowSizeBlock overrideDisplayTraitsWithWindowSize;
/**
* @abstract Passthrough property to the the .interfaceState of the node.
* @return The current ASInterfaceState of the node, indicating whether it is visible and other situational properties.