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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!
60 lines
2.1 KiB
Objective-C
60 lines
2.1 KiB
Objective-C
//
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// ASViewController.h
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// AsyncDisplayKit
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//
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// Created by Huy Nguyen on 16/09/15.
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// Copyright (c) 2015 Facebook. All rights reserved.
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//
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#import <UIKit/UIKit.h>
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#import <AsyncDisplayKit/ASDisplayNode.h>
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NS_ASSUME_NONNULL_BEGIN
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typedef ASDisplayTraits (^ASDisplayTraitsForTraitCollectionBlock)(UITraitCollection *traitCollection);
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typedef ASDisplayTraits (^ASDisplayTraitsForTraitWindowSizeBlock)(CGSize windowSize);
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@interface ASViewController<__covariant DisplayNodeType : ASDisplayNode *> : UIViewController
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- (instancetype)initWithNode:(DisplayNodeType)node NS_DESIGNATED_INITIALIZER;
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@property (nonatomic, strong, readonly) DisplayNodeType node;
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@property (nonatomic, strong) id displayTraitsContext;
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/**
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* Set this block to customize the ASDisplayTraits returned when the VC transitions to the given traitCollection.
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*/
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@property (nonatomic, copy) ASDisplayTraitsForTraitCollectionBlock overrideDisplayTraitsWithTraitCollection;
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/**
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* Set this block to customize the ASDisplayTraits returned when the VC transitions to the given window size.
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*/
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@property (nonatomic, copy) ASDisplayTraitsForTraitWindowSizeBlock overrideDisplayTraitsWithWindowSize;
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/**
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* @abstract Passthrough property to the the .interfaceState of the node.
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* @return The current ASInterfaceState of the node, indicating whether it is visible and other situational properties.
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* @see ASInterfaceState
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*/
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@property (nonatomic, readonly) ASInterfaceState interfaceState;
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// AsyncDisplayKit 2.0 BETA: This property is still being tested, but it allows
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// blocking as a view controller becomes visible to ensure no placeholders flash onscreen.
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// Refer to examples/SynchronousConcurrency, AsyncViewController.m
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@property (nonatomic, assign) BOOL neverShowPlaceholders;
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/**
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* The constrained size used to measure the backing node.
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*
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* @discussion Defaults to providing a size range that uses the view controller view's bounds as
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* both the min and max definitions. Override this method to provide a custom size range to the
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* backing node.
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*/
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- (ASSizeRange)nodeConstrainedSize;
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@end
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NS_ASSUME_NONNULL_END |