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[ASDisplayNode] Add onDidLoad Method to Perform Work When Loaded (#2128)

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* [ASDisplayNode] Add `onDidLoad:` method

* Prevent user from rasterizing wrapper nodes – they can't be reloaded in the future
This commit is contained in:
Adlai Holler
2016-09-08 14:18:35 -07:00
committed by GitHub
parent 593f13d800
commit bc59b96ca9
4 changed files with 78 additions and 10 deletions
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16
AsyncDisplayKit/ASDisplayNode.h
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@@ -40,7 +40,7 @@ typedef CALayer * _Nonnull(^ASDisplayNodeLayerBlock)();
/**
* ASDisplayNode loaded callback block. This block is called BEFORE the -didLoad method and is always called on the main thread.
*/
typedef void (^ASDisplayNodeDidLoadBlock)(ASDisplayNode * _Nonnull node);
typedef void (^ASDisplayNodeDidLoadBlock)(__kindof ASDisplayNode * _Nonnull node);
/**
* ASDisplayNode will / did render node content in context.
@@ -50,7 +50,7 @@ typedef void (^ASDisplayNodeContextModifier)(_Nonnull CGContextRef context);
/**
* ASDisplayNode layout spec block. This block can be used instead of implementing layoutSpecThatFits: in subclass
*/
typedef ASLayoutSpec * _Nonnull(^ASLayoutSpecBlock)(ASDisplayNode * _Nonnull node, ASSizeRange constrainedSize);
typedef ASLayoutSpec * _Nonnull(^ASLayoutSpecBlock)(__kindof ASDisplayNode * _Nonnull node, ASSizeRange constrainedSize);
/**
Interface state is available on ASDisplayNode and ASViewController, and
@@ -160,6 +160,18 @@ NS_ASSUME_NONNULL_BEGIN
*/
- (instancetype)initWithLayerBlock:(ASDisplayNodeLayerBlock)layerBlock didLoadBlock:(nullable ASDisplayNodeDidLoadBlock)didLoadBlock;
/**
* @abstract Add a block of work to be performed on the main thread when the node's view or layer is loaded. Thread safe.
* @warning Be careful not to retain self in `body`. Change the block parameter list to `^(MYCustomNode *self) {}` if you
* want to shadow self (e.g. if calling this during `init`).
*
* @param body The work to be performed when the node is loaded.
*
* @precondition The node is not already loaded.
* @note This will only be called the next time the node is loaded. If the node is later added to a subtree of a node
* that has `shouldRasterizeDescendants=YES`, and is unloaded, this block will not be called if it is loaded again.
*/
- (void)onDidLoad:(ASDisplayNodeDidLoadBlock)body;
/** @name Properties */