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7dd94a6102
Introduce `ASTableView`, a UITableView subclass that uses `ASCellNode` instead of UITableViewCell. Add working range support via `ASRangeController`, which observes the visible range, maintains a working range, and handles most ASDK machinery. ASRangeController is loosely-enough coupled that it should be easily adapted to UICollectionView if that's desired in the future. Notable considerations in the ASRangeController architecture: * There's no sense rewriting UITableView -- the real win comes from using nodes instead of UITableViewCells (easily parallelisable computation, large number of cells vs. few table views, etc.). So, use a UITableView with empty cells, using UITableViewCell's contentView as a host for arbitrary node hierarchies. * Instead of lazy-loading cells the instant they're needed by UITableView, load them in advance. Preload a substantial number of nodes in the direction of scroll, as well as a small buffer in the other direction. * Maintain compatibility with UITableView's API, with one primary change -- consumer code yields configured ASCellNodes, not UITableViewCells. * Don't use -tableView:heightForRowAtIndexPath:. Nodes already compute their preferred sizes and cache results for use at layout-time, so ASTableView uses their calculatedSizes directly. * Corollary: ASTableView is only aware of nodes that have been sized. This means that, if a cell appears onscreen, it has layout data and can display a "realistic placeholder", e.g. by making its subnodes' background colour grey. Other improvements: * Remove dead references and update headers (fixes #7, #20). * Rename `-[ASDisplayNode sizeToFit:]` to `-measure:` and fix `constrainedSizeForCalulatedSize` typo (fixes #15). * Rename `-willAppear` and `-didDisappear` to `-willEnterHierarchy` and `-didExitHierarchy`. Remove `-willDisappear` -- it was redundant, and there was no counterpart `-didAppear`. * Rename `viewLoaded` to `nodeLoaded`.
23 lines
568 B
Objective-C
23 lines
568 B
Objective-C
/* Copyright (c) 2014-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import <AsyncDisplayKit/ASDisplayNode.h>
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@interface ASCellNode : ASDisplayNode
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// TODO expose some UITableViewCell things for configuration, eg, separator style
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@end
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@interface ASTextCellNode : ASCellNode
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@property (nonatomic, copy) NSString *text;
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@end
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