forked from TextureGroup/Texture
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathASTableView.mm
2046 lines (1746 loc) · 78.7 KB
/
ASTableView.mm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
//
// ASTableView.mm
// Texture
//
// Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
// Changes after 4/13/2017 are: Copyright (c) Pinterest, Inc. All rights reserved.
// Licensed under Apache 2.0: http://www.apache.org/licenses/LICENSE-2.0
//
#import <AsyncDisplayKit/ASTableViewInternal.h>
#import <AsyncDisplayKit/_ASCoreAnimationExtras.h>
#import <AsyncDisplayKit/_ASDisplayLayer.h>
#import <AsyncDisplayKit/_ASHierarchyChangeSet.h>
#import <AsyncDisplayKit/ASBatchFetching.h>
#import <AsyncDisplayKit/ASCellNode+Internal.h>
#import <AsyncDisplayKit/ASCollectionElement.h>
#import <AsyncDisplayKit/ASCollections.h>
#import <AsyncDisplayKit/ASConfigurationInternal.h>
#import <AsyncDisplayKit/ASDelegateProxy.h>
#import <AsyncDisplayKit/ASDisplayNodeExtras.h>
#import <AsyncDisplayKit/ASDisplayNode+FrameworkPrivate.h>
#import <AsyncDisplayKit/ASDisplayNodeInternal.h>
#import <AsyncDisplayKit/ASElementMap.h>
#import <AsyncDisplayKit/ASInternalHelpers.h>
#import <AsyncDisplayKit/ASLayout.h>
#import <AsyncDisplayKit/ASTableNode+Beta.h>
#import <AsyncDisplayKit/ASRangeController.h>
#import <AsyncDisplayKit/ASTableLayoutController.h>
#import <AsyncDisplayKit/ASBatchContext.h>
#import <AsyncDisplayKit/ASTableView+Undeprecated.h>
static NSString * const kCellReuseIdentifier = @"_ASTableViewCell";
//#define LOG(...) NSLog(__VA_ARGS__)
#define LOG(...)
/**
* See note at the top of ASCollectionView.mm near declaration of macro GET_COLLECTIONNODE_OR_RETURN
*/
#define GET_TABLENODE_OR_RETURN(__var, __val) \
ASTableNode *__var = self.tableNode; \
if (__var == nil) { \
return __val; \
}
#define UITABLEVIEW_RESPONDS_TO_SELECTOR() \
({ \
static BOOL superResponds; \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
superResponds = [UITableView instancesRespondToSelector:_cmd]; \
}); \
superResponds; \
})
@interface UITableView (ScrollViewDelegate)
- (void)scrollViewDidScroll:(UIScrollView *)scrollView;
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView;
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView;
- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset;
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate;
@end
#pragma mark -
#pragma mark ASCellNode<->UITableViewCell bridging.
@class _ASTableViewCell;
@protocol _ASTableViewCellDelegate <NSObject>
- (void)didLayoutSubviewsOfTableViewCell:(_ASTableViewCell *)tableViewCell;
@end
@interface _ASTableViewCell : UITableViewCell
@property (nonatomic, weak) id<_ASTableViewCellDelegate> delegate;
@property (nonatomic, readonly) ASCellNode *node;
@property (nonatomic) ASCollectionElement *element;
@end
@implementation _ASTableViewCell
// TODO add assertions to prevent use of view-backed UITableViewCell properties (eg .textLabel)
- (void)layoutSubviews
{
[super layoutSubviews];
[_delegate didLayoutSubviewsOfTableViewCell:self];
}
- (void)didTransitionToState:(UITableViewCellStateMask)state
{
[self setNeedsLayout];
[self layoutIfNeeded];
[super didTransitionToState:state];
}
- (ASCellNode *)node
{
return self.element.node;
}
- (void)setElement:(ASCollectionElement *)element
{
_element = element;
ASCellNode *node = element.node;
if (node) {
self.backgroundColor = node.backgroundColor;
self.selectedBackgroundView = node.selectedBackgroundView;
self.backgroundView = node.backgroundView;
#if TARGET_OS_IOS
self.separatorInset = node.separatorInset;
#endif
self.selectionStyle = node.selectionStyle;
self.focusStyle = node.focusStyle;
self.accessoryType = node.accessoryType;
self.isAccessibilityElement = node.isAccessibilityElement;
self.accessibilityElementsHidden = node.accessibilityElementsHidden;
// the following ensures that we clip the entire cell to it's bounds if node.clipsToBounds is set (the default)
// This is actually a workaround for a bug we are seeing in some rare cases (selected background view
// overlaps other cells if size of ASCellNode has changed.)
self.clipsToBounds = node.clipsToBounds;
// If the cell node has been explicitly configured with a tint color, we can apply that directly to the cell view to preserve the previous behavior
self.tintColor = node->_tintColor;
}
[node __setSelectedFromUIKit:self.selected];
[node __setHighlightedFromUIKit:self.highlighted];
}
- (BOOL)consumesCellNodeVisibilityEvents
{
ASCellNode *node = self.node;
if (node == nil) {
return NO;
}
return ASSubclassOverridesSelector([ASCellNode class], [node class], @selector(cellNodeVisibilityEvent:inScrollView:withCellFrame:));
}
- (void)setSelected:(BOOL)selected animated:(BOOL)animated
{
[super setSelected:selected animated:animated];
[self.node __setSelectedFromUIKit:selected];
}
- (void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated
{
[super setHighlighted:highlighted animated:animated];
[self.node __setHighlightedFromUIKit:highlighted];
}
- (void)prepareForReuse
{
// Need to clear element before UIKit calls setSelected:NO / setHighlighted:NO on its cells
self.element = nil;
[super prepareForReuse];
}
@end
#pragma mark -
#pragma mark ASTableView
@interface ASTableView () <ASRangeControllerDataSource, ASRangeControllerDelegate, ASDataControllerSource, _ASTableViewCellDelegate, ASCellNodeInteractionDelegate, ASDelegateProxyInterceptor, ASBatchFetchingScrollView>
{
ASTableViewProxy *_proxyDataSource;
ASTableViewProxy *_proxyDelegate;
ASTableLayoutController *_layoutController;
ASRangeController *_rangeController;
ASBatchContext *_batchContext;
// When we update our data controller in response to an interactive move,
// we don't want to tell the table view about the change (it knows!)
BOOL _updatingInResponseToInteractiveMove;
BOOL _inverted;
// The top cell node that was visible before the update.
__weak ASCellNode *_contentOffsetAdjustmentTopVisibleNode;
// The y-offset of the top visible row's origin before the update.
CGFloat _contentOffsetAdjustmentTopVisibleNodeOffset;
CGFloat _leadingScreensForBatching;
BOOL _automaticallyAdjustsContentOffset;
CGPoint _deceleratingVelocity;
CGFloat _nodesConstrainedWidth;
BOOL _queuedNodeHeightUpdate;
BOOL _isDeallocating;
NSHashTable<_ASTableViewCell *> *_cellsForVisibilityUpdates;
// CountedSet because UIKit may display the same element in multiple cells e.g. during animations.
NSCountedSet<ASCollectionElement *> *_visibleElements;
NSHashTable<ASCellNode *> *_cellsForLayoutUpdates;
// See documentation on same property in ASCollectionView
BOOL _hasEverCheckedForBatchFetchingDueToUpdate;
// The section index overlay view, if there is one present.
// This is useful because we need to measure our row nodes against (width - indexView.width).
__weak UIView *_sectionIndexView;
/**
* The change set that we're currently building, if any.
*/
_ASHierarchyChangeSet *_changeSet;
/**
* Counter used to keep track of nested batch updates.
*/
NSInteger _batchUpdateCount;
/**
* Keep a strong reference to node till view is ready to release.
*/
ASTableNode *_keepalive_node;
struct {
unsigned int scrollViewDidScroll:1;
unsigned int scrollViewWillBeginDragging:1;
unsigned int scrollViewDidEndDragging:1;
unsigned int scrollViewWillEndDragging:1;
unsigned int scrollViewDidEndDecelerating:1;
unsigned int tableNodeWillDisplayNodeForRow:1;
unsigned int tableViewWillDisplayNodeForRow:1;
unsigned int tableViewWillDisplayNodeForRowDeprecated:1;
unsigned int tableNodeDidEndDisplayingNodeForRow:1;
unsigned int tableViewDidEndDisplayingNodeForRow:1;
unsigned int tableNodeWillBeginBatchFetch:1;
unsigned int tableViewWillBeginBatchFetch:1;
unsigned int shouldBatchFetchForTableView:1;
unsigned int shouldBatchFetchForTableNode:1;
unsigned int tableViewConstrainedSizeForRow:1;
unsigned int tableNodeConstrainedSizeForRow:1;
unsigned int tableViewWillSelectRow:1;
unsigned int tableNodeWillSelectRow:1;
unsigned int tableViewDidSelectRow:1;
unsigned int tableNodeDidSelectRow:1;
unsigned int tableViewWillDeselectRow:1;
unsigned int tableNodeWillDeselectRow:1;
unsigned int tableViewDidDeselectRow:1;
unsigned int tableNodeDidDeselectRow:1;
unsigned int tableViewShouldHighlightRow:1;
unsigned int tableNodeShouldHighlightRow:1;
unsigned int tableViewDidHighlightRow:1;
unsigned int tableNodeDidHighlightRow:1;
unsigned int tableViewDidUnhighlightRow:1;
unsigned int tableNodeDidUnhighlightRow:1;
unsigned int tableViewShouldShowMenuForRow:1;
unsigned int tableNodeShouldShowMenuForRow:1;
unsigned int tableViewCanPerformActionForRow:1;
unsigned int tableNodeCanPerformActionForRow:1;
unsigned int tableViewPerformActionForRow:1;
unsigned int tableNodePerformActionForRow:1;
} _asyncDelegateFlags;
struct {
unsigned int numberOfSectionsInTableView:1;
unsigned int numberOfSectionsInTableNode:1;
unsigned int tableNodeNumberOfRowsInSection:1;
unsigned int tableViewNumberOfRowsInSection:1;
unsigned int tableViewNodeBlockForRow:1;
unsigned int tableNodeNodeBlockForRow:1;
unsigned int tableViewNodeForRow:1;
unsigned int tableNodeNodeForRow:1;
unsigned int tableViewCanMoveRow:1;
unsigned int tableNodeCanMoveRow:1;
unsigned int tableViewMoveRow:1;
unsigned int tableNodeMoveRow:1;
unsigned int sectionIndexMethods:1; // if both section index methods are implemented
unsigned int modelIdentifierMethods:1; // if both modelIdentifierForElementAtIndexPath and indexPathForElementWithModelIdentifier are implemented
} _asyncDataSourceFlags;
}
@property (nonatomic) ASDataController *dataController;
@property (nonatomic, weak) ASTableNode *tableNode;
@property (nonatomic) BOOL test_enableSuperUpdateCallLogging;
@end
@implementation ASTableView
{
__weak id<ASTableDelegate> _asyncDelegate;
__weak id<ASTableDataSource> _asyncDataSource;
}
// Using _ASDisplayLayer ensures things like -layout are properly forwarded to ASTableNode.
+ (Class)layerClass
{
return [_ASDisplayLayer class];
}
+ (Class)dataControllerClass
{
return [ASDataController class];
}
#pragma mark -
#pragma mark Lifecycle
- (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style
{
return [self _initWithFrame:frame style:style dataControllerClass:nil owningNode:nil];
}
- (instancetype)_initWithFrame:(CGRect)frame style:(UITableViewStyle)style dataControllerClass:(Class)dataControllerClass owningNode:(ASTableNode *)tableNode
{
if (!(self = [super initWithFrame:frame style:style])) {
return nil;
}
_cellsForVisibilityUpdates = [NSHashTable hashTableWithOptions:NSHashTableObjectPointerPersonality];
_cellsForLayoutUpdates = [NSHashTable hashTableWithOptions:NSHashTableObjectPointerPersonality];
if (!dataControllerClass) {
dataControllerClass = [[self class] dataControllerClass];
}
_layoutController = [[ASTableLayoutController alloc] initWithTableView:self];
_rangeController = [[ASRangeController alloc] init];
_rangeController.layoutController = _layoutController;
_rangeController.dataSource = self;
_rangeController.delegate = self;
_dataController = [[dataControllerClass alloc] initWithDataSource:self node:tableNode];
_dataController.delegate = _rangeController;
_leadingScreensForBatching = 2.0;
_batchContext = [[ASBatchContext alloc] init];
_visibleElements = [[NSCountedSet alloc] init];
_automaticallyAdjustsContentOffset = NO;
_nodesConstrainedWidth = self.bounds.size.width;
_proxyDelegate = [[ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
super.delegate = (id<UITableViewDelegate>)_proxyDelegate;
_proxyDataSource = [[ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
super.dataSource = (id<UITableViewDataSource>)_proxyDataSource;
[self registerClass:_ASTableViewCell.class forCellReuseIdentifier:kCellReuseIdentifier];
// iOS 11 automatically uses estimated heights, so disable those (see PR #485)
super.estimatedRowHeight = 0.0;
super.estimatedSectionHeaderHeight = 0.0;
super.estimatedSectionFooterHeight = 0.0;
return self;
}
- (instancetype)initWithCoder:(NSCoder *)aDecoder
{
NSLog(@"Warning: AsyncDisplayKit is not designed to be used with Interface Builder. Table properties set in IB will be lost.");
return [self initWithFrame:CGRectZero style:UITableViewStylePlain];
}
- (void)dealloc
{
ASDisplayNodeAssertMainThread();
ASDisplayNodeCAssert(_batchUpdateCount == 0, @"ASTableView deallocated in the middle of a batch update.");
// Sometimes the UIKit classes can call back to their delegate even during deallocation.
_isDeallocating = YES;
if (!ASActivateExperimentalFeature(ASExperimentalCollectionTeardown)) {
[self setAsyncDelegate:nil];
[self setAsyncDataSource:nil];
}
}
#pragma mark -
#pragma mark Overrides
- (void)setDataSource:(id<UITableViewDataSource>)dataSource
{
// UIKit can internally generate a call to this method upon changing the asyncDataSource; only assert for non-nil.
ASDisplayNodeAssert(dataSource == nil, @"ASTableView uses asyncDataSource, not UITableView's dataSource property.");
}
- (void)setDelegate:(id<UITableViewDelegate>)delegate
{
// Our UIScrollView superclass sets its delegate to nil on dealloc. Only assert if we get a non-nil value here.
ASDisplayNodeAssert(delegate == nil, @"ASTableView uses asyncDelegate, not UITableView's delegate property.");
}
- (id<ASTableDataSource>)asyncDataSource
{
return _asyncDataSource;
}
- (void)setAsyncDataSource:(id<ASTableDataSource>)asyncDataSource
{
// Changing super.dataSource will trigger a setNeedsLayout, so this must happen on the main thread.
ASDisplayNodeAssertMainThread();
// Note: It's common to check if the value hasn't changed and short-circuit but we aren't doing that here to handle
// the (common) case of nilling the asyncDataSource in the ViewController's dealloc. In this case our _asyncDataSource
// will return as nil (ARC magic) even though the _proxyDataSource still exists. It's really important to hold a strong
// reference to the old dataSource in this case because calls to ASTableViewProxy will start failing and cause crashes.
NS_VALID_UNTIL_END_OF_SCOPE id oldDataSource = self.dataSource;
if (asyncDataSource == nil) {
_asyncDataSource = nil;
_proxyDataSource = _isDeallocating ? nil : [[ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
memset(&_asyncDataSourceFlags, 0, sizeof(_asyncDataSourceFlags));
} else {
_asyncDataSource = asyncDataSource;
_proxyDataSource = [[ASTableViewProxy alloc] initWithTarget:_asyncDataSource interceptor:self];
_asyncDataSourceFlags.numberOfSectionsInTableView = [_asyncDataSource respondsToSelector:@selector(numberOfSectionsInTableView:)];
_asyncDataSourceFlags.numberOfSectionsInTableNode = [_asyncDataSource respondsToSelector:@selector(numberOfSectionsInTableNode:)];
_asyncDataSourceFlags.tableViewNumberOfRowsInSection = [_asyncDataSource respondsToSelector:@selector(tableView:numberOfRowsInSection:)];
_asyncDataSourceFlags.tableNodeNumberOfRowsInSection = [_asyncDataSource respondsToSelector:@selector(tableNode:numberOfRowsInSection:)];
_asyncDataSourceFlags.tableViewNodeForRow = [_asyncDataSource respondsToSelector:@selector(tableView:nodeForRowAtIndexPath:)];
_asyncDataSourceFlags.tableNodeNodeForRow = [_asyncDataSource respondsToSelector:@selector(tableNode:nodeForRowAtIndexPath:)];
_asyncDataSourceFlags.tableViewNodeBlockForRow = [_asyncDataSource respondsToSelector:@selector(tableView:nodeBlockForRowAtIndexPath:)];
_asyncDataSourceFlags.tableNodeNodeBlockForRow = [_asyncDataSource respondsToSelector:@selector(tableNode:nodeBlockForRowAtIndexPath:)];
_asyncDataSourceFlags.tableViewCanMoveRow = [_asyncDataSource respondsToSelector:@selector(tableView:canMoveRowAtIndexPath:)];
_asyncDataSourceFlags.tableViewMoveRow = [_asyncDataSource respondsToSelector:@selector(tableView:moveRowAtIndexPath:toIndexPath:)];
_asyncDataSourceFlags.sectionIndexMethods = [_asyncDataSource respondsToSelector:@selector(sectionIndexTitlesForTableView:)] && [_asyncDataSource respondsToSelector:@selector(tableView:sectionForSectionIndexTitle:atIndex:)];
_asyncDataSourceFlags.modelIdentifierMethods = [_asyncDataSource respondsToSelector:@selector(modelIdentifierForElementAtIndexPath:inNode:)] && [_asyncDataSource respondsToSelector:@selector(indexPathForElementWithModelIdentifier:inNode:)];
ASDisplayNodeAssert(_asyncDataSourceFlags.tableViewNodeBlockForRow
|| _asyncDataSourceFlags.tableViewNodeForRow
|| _asyncDataSourceFlags.tableNodeNodeBlockForRow
|| _asyncDataSourceFlags.tableNodeNodeForRow, @"Data source must implement tableNode:nodeBlockForRowAtIndexPath: or tableNode:nodeForRowAtIndexPath:");
ASDisplayNodeAssert(_asyncDataSourceFlags.tableNodeNumberOfRowsInSection || _asyncDataSourceFlags.tableViewNumberOfRowsInSection, @"Data source must implement tableNode:numberOfRowsInSection:");
}
_dataController.validationErrorSource = asyncDataSource;
super.dataSource = (id<UITableViewDataSource>)_proxyDataSource;
[self _asyncDelegateOrDataSourceDidChange];
}
- (id<ASTableDelegate>)asyncDelegate
{
return _asyncDelegate;
}
- (void)setAsyncDelegate:(id<ASTableDelegate>)asyncDelegate
{
// Changing super.delegate will trigger a setNeedsLayout, so this must happen on the main thread.
ASDisplayNodeAssertMainThread();
// Note: It's common to check if the value hasn't changed and short-circuit but we aren't doing that here to handle
// the (common) case of nilling the asyncDelegate in the ViewController's dealloc. In this case our _asyncDelegate
// will return as nil (ARC magic) even though the _proxyDataSource still exists. It's really important to hold a strong
// reference to the old delegate in this case because calls to ASTableViewProxy will start failing and cause crashes.
NS_VALID_UNTIL_END_OF_SCOPE id oldDelegate = super.delegate;
if (asyncDelegate == nil) {
_asyncDelegate = nil;
_proxyDelegate = _isDeallocating ? nil : [[ASTableViewProxy alloc] initWithTarget:nil interceptor:self];
memset(&_asyncDelegateFlags, 0, sizeof(_asyncDelegateFlags));
} else {
_asyncDelegate = asyncDelegate;
_proxyDelegate = [[ASTableViewProxy alloc] initWithTarget:_asyncDelegate interceptor:self];
_asyncDelegateFlags.scrollViewDidScroll = [_asyncDelegate respondsToSelector:@selector(scrollViewDidScroll:)];
_asyncDelegateFlags.tableViewWillDisplayNodeForRow = [_asyncDelegate respondsToSelector:@selector(tableView:willDisplayNode:forRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeWillDisplayNodeForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:willDisplayRowWithNode:)];
if (_asyncDelegateFlags.tableViewWillDisplayNodeForRow == NO) {
_asyncDelegateFlags.tableViewWillDisplayNodeForRowDeprecated = [_asyncDelegate respondsToSelector:@selector(tableView:willDisplayNodeForRowAtIndexPath:)];
}
_asyncDelegateFlags.tableViewDidEndDisplayingNodeForRow = [_asyncDelegate respondsToSelector:@selector(tableView:didEndDisplayingNode:forRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidEndDisplayingNodeForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didEndDisplayingRowWithNode:)];
_asyncDelegateFlags.scrollViewWillEndDragging = [_asyncDelegate respondsToSelector:@selector(scrollViewWillEndDragging:withVelocity:targetContentOffset:)];
_asyncDelegateFlags.scrollViewDidEndDecelerating = [_asyncDelegate respondsToSelector:@selector(scrollViewDidEndDecelerating:)];
_asyncDelegateFlags.tableViewWillBeginBatchFetch = [_asyncDelegate respondsToSelector:@selector(tableView:willBeginBatchFetchWithContext:)];
_asyncDelegateFlags.tableNodeWillBeginBatchFetch = [_asyncDelegate respondsToSelector:@selector(tableNode:willBeginBatchFetchWithContext:)];
_asyncDelegateFlags.shouldBatchFetchForTableView = [_asyncDelegate respondsToSelector:@selector(shouldBatchFetchForTableView:)];
_asyncDelegateFlags.shouldBatchFetchForTableNode = [_asyncDelegate respondsToSelector:@selector(shouldBatchFetchForTableNode:)];
_asyncDelegateFlags.scrollViewWillBeginDragging = [_asyncDelegate respondsToSelector:@selector(scrollViewWillBeginDragging:)];
_asyncDelegateFlags.scrollViewDidEndDragging = [_asyncDelegate respondsToSelector:@selector(scrollViewDidEndDragging:willDecelerate:)];
_asyncDelegateFlags.tableViewConstrainedSizeForRow = [_asyncDelegate respondsToSelector:@selector(tableView:constrainedSizeForRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeConstrainedSizeForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:constrainedSizeForRowAtIndexPath:)];
_asyncDelegateFlags.tableViewWillSelectRow = [_asyncDelegate respondsToSelector:@selector(tableView:willSelectRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeWillSelectRow = [_asyncDelegate respondsToSelector:@selector(tableNode:willSelectRowAtIndexPath:)];
_asyncDelegateFlags.tableViewDidSelectRow = [_asyncDelegate respondsToSelector:@selector(tableView:didSelectRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidSelectRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didSelectRowAtIndexPath:)];
_asyncDelegateFlags.tableViewWillDeselectRow = [_asyncDelegate respondsToSelector:@selector(tableView:willDeselectRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeWillDeselectRow = [_asyncDelegate respondsToSelector:@selector(tableNode:willDeselectRowAtIndexPath:)];
_asyncDelegateFlags.tableViewDidDeselectRow = [_asyncDelegate respondsToSelector:@selector(tableView:didDeselectRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidDeselectRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didDeselectRowAtIndexPath:)];
_asyncDelegateFlags.tableViewShouldHighlightRow = [_asyncDelegate respondsToSelector:@selector(tableView:shouldHighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeShouldHighlightRow = [_asyncDelegate respondsToSelector:@selector(tableNode:shouldHighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableViewDidHighlightRow = [_asyncDelegate respondsToSelector:@selector(tableView:didHighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidHighlightRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didHighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableViewDidUnhighlightRow = [_asyncDelegate respondsToSelector:@selector(tableView:didUnhighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeDidUnhighlightRow = [_asyncDelegate respondsToSelector:@selector(tableNode:didUnhighlightRowAtIndexPath:)];
_asyncDelegateFlags.tableViewShouldShowMenuForRow = [_asyncDelegate respondsToSelector:@selector(tableView:shouldShowMenuForRowAtIndexPath:)];
_asyncDelegateFlags.tableNodeShouldShowMenuForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:shouldShowMenuForRowAtIndexPath:)];
_asyncDelegateFlags.tableViewCanPerformActionForRow = [_asyncDelegate respondsToSelector:@selector(tableView:canPerformAction:forRowAtIndexPath:withSender:)];
_asyncDelegateFlags.tableNodeCanPerformActionForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:canPerformAction:forRowAtIndexPath:withSender:)];
_asyncDelegateFlags.tableViewPerformActionForRow = [_asyncDelegate respondsToSelector:@selector(tableView:performAction:forRowAtIndexPath:withSender:)];
_asyncDelegateFlags.tableNodePerformActionForRow = [_asyncDelegate respondsToSelector:@selector(tableNode:performAction:forRowAtIndexPath:withSender:)];
}
super.delegate = (id<UITableViewDelegate>)_proxyDelegate;
[self _asyncDelegateOrDataSourceDidChange];
}
- (void)_asyncDelegateOrDataSourceDidChange
{
ASDisplayNodeAssertMainThread();
if (_asyncDataSource == nil && _asyncDelegate == nil && !ASActivateExperimentalFeature(ASExperimentalSkipClearData)) {
[_dataController clearData];
}
}
- (void)proxyTargetHasDeallocated:(ASDelegateProxy *)proxy
{
if (proxy == _proxyDelegate) {
[self setAsyncDelegate:nil];
} else if (proxy == _proxyDataSource) {
[self setAsyncDataSource:nil];
}
}
- (void)reloadDataWithCompletion:(void (^)())completion
{
ASDisplayNodeAssertMainThread();
if (! _dataController.initialReloadDataHasBeenCalled) {
// If this is the first reload, forward to super immediately to prevent it from triggering more "initial" loads while our data controller is working.
[super reloadData];
}
void (^batchUpdatesCompletion)(BOOL);
if (completion) {
batchUpdatesCompletion = ^(BOOL) {
completion();
};
}
[self beginUpdates];
[_changeSet reloadData];
[self endUpdatesWithCompletion:batchUpdatesCompletion];
}
- (void)reloadData
{
[self reloadDataWithCompletion:nil];
}
- (void)scrollToRowAtIndexPath:(NSIndexPath *)indexPath atScrollPosition:(UITableViewScrollPosition)scrollPosition animated:(BOOL)animated
{
if ([self validateIndexPath:indexPath]) {
[super scrollToRowAtIndexPath:indexPath atScrollPosition:scrollPosition animated:animated];
}
}
- (void)relayoutItems
{
[_dataController relayoutAllNodesWithInvalidationBlock:nil];
}
- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeType:(ASLayoutRangeType)rangeType
{
[_rangeController setTuningParameters:tuningParameters forRangeMode:ASLayoutRangeModeFull rangeType:rangeType];
}
- (ASRangeTuningParameters)tuningParametersForRangeType:(ASLayoutRangeType)rangeType
{
return [_rangeController tuningParametersForRangeMode:ASLayoutRangeModeFull rangeType:rangeType];
}
- (void)setTuningParameters:(ASRangeTuningParameters)tuningParameters forRangeMode:(ASLayoutRangeMode)rangeMode rangeType:(ASLayoutRangeType)rangeType
{
[_rangeController setTuningParameters:tuningParameters forRangeMode:rangeMode rangeType:rangeType];
}
- (ASRangeTuningParameters)tuningParametersForRangeMode:(ASLayoutRangeMode)rangeMode rangeType:(ASLayoutRangeType)rangeType
{
return [_rangeController tuningParametersForRangeMode:rangeMode rangeType:rangeType];
}
- (ASElementMap *)elementMapForRangeController:(ASRangeController *)rangeController
{
return _dataController.visibleMap;
}
- (ASCellNode *)nodeForRowAtIndexPath:(NSIndexPath *)indexPath
{
return [_dataController.visibleMap elementForItemAtIndexPath:indexPath].node;
}
- (NSIndexPath *)convertIndexPathFromTableNode:(NSIndexPath *)indexPath waitingIfNeeded:(BOOL)wait
{
NSIndexPath *viewIndexPath = [_dataController.visibleMap convertIndexPath:indexPath fromMap:_dataController.pendingMap];
if (viewIndexPath == nil && wait) {
[self waitUntilAllUpdatesAreCommitted];
return [self convertIndexPathFromTableNode:indexPath waitingIfNeeded:NO];
}
return viewIndexPath;
}
- (NSIndexPath *)convertIndexPathToTableNode:(NSIndexPath *)indexPath
{
if ([self validateIndexPath:indexPath] == nil) {
return nil;
}
return [_dataController.pendingMap convertIndexPath:indexPath fromMap:_dataController.visibleMap];
}
- (NSArray<NSIndexPath *> *)convertIndexPathsToTableNode:(NSArray<NSIndexPath *> *)indexPaths
{
if (indexPaths == nil) {
return nil;
}
NSMutableArray<NSIndexPath *> *indexPathsArray = [NSMutableArray new];
for (NSIndexPath *indexPathInView in indexPaths) {
NSIndexPath *indexPath = [self convertIndexPathToTableNode:indexPathInView];
if (indexPath != nil) {
[indexPathsArray addObject:indexPath];
}
}
return indexPathsArray;
}
- (NSIndexPath *)indexPathForNode:(ASCellNode *)cellNode
{
return [self indexPathForNode:cellNode waitingIfNeeded:NO];
}
/**
* Asserts that the index path is a valid view-index-path, and returns it if so, nil otherwise.
*/
- (nullable NSIndexPath *)validateIndexPath:(nullable NSIndexPath *)indexPath
{
if (indexPath == nil) {
return nil;
}
NSInteger section = indexPath.section;
if (section >= self.numberOfSections) {
ASDisplayNodeFailAssert(@"Table view index path has invalid section %lu, section count = %lu", (unsigned long)section, (unsigned long)self.numberOfSections);
return nil;
}
NSInteger item = indexPath.item;
// item == NSNotFound means e.g. "scroll to this section" and is acceptable
if (item != NSNotFound && item >= [self numberOfRowsInSection:section]) {
ASDisplayNodeFailAssert(@"Table view index path has invalid item %lu in section %lu, item count = %lu", (unsigned long)indexPath.item, (unsigned long)section, (unsigned long)[self numberOfRowsInSection:section]);
return nil;
}
return indexPath;
}
- (nullable NSIndexPath *)indexPathForNode:(ASCellNode *)cellNode waitingIfNeeded:(BOOL)wait
{
if (cellNode == nil) {
return nil;
}
NSIndexPath *indexPath = [_dataController.visibleMap indexPathForElement:cellNode.collectionElement];
indexPath = [self validateIndexPath:indexPath];
if (indexPath == nil && wait) {
[self waitUntilAllUpdatesAreCommitted];
return [self indexPathForNode:cellNode waitingIfNeeded:NO];
}
return indexPath;
}
- (NSArray<ASCellNode *> *)visibleNodes
{
const auto elements = [self visibleElementsForRangeController:_rangeController];
return ASArrayByFlatMapping(elements, ASCollectionElement *e, e.node);
}
- (void)beginUpdates
{
ASDisplayNodeAssertMainThread();
// _changeSet must be available during batch update
ASDisplayNodeAssertTrue((_batchUpdateCount > 0) == (_changeSet != nil));
if (_batchUpdateCount == 0) {
_changeSet = [[_ASHierarchyChangeSet alloc] initWithOldData:[_dataController itemCountsFromDataSource]];
}
_batchUpdateCount++;
}
- (void)endUpdates
{
[self endUpdatesWithCompletion:nil];
}
- (void)endUpdatesWithCompletion:(void (^)(BOOL completed))completion
{
// We capture the current state of whether animations are enabled if they don't provide us with one.
[self endUpdatesAnimated:[UIView areAnimationsEnabled] completion:completion];
}
- (void)endUpdatesAnimated:(BOOL)animated completion:(void (^)(BOOL completed))completion
{
ASDisplayNodeAssertMainThread();
ASDisplayNodeAssertNotNil(_changeSet, @"_changeSet must be available when batch update ends");
_batchUpdateCount--;
// Prevent calling endUpdatesAnimated:completion: in an unbalanced way
NSAssert(_batchUpdateCount >= 0, @"endUpdatesAnimated:completion: called without having a balanced beginUpdates call");
[_changeSet addCompletionHandler:completion];
if (_batchUpdateCount == 0) {
_ASHierarchyChangeSet *changeSet = _changeSet;
// Nil out _changeSet before forwarding to _dataController to allow the change set to cause subsequent batch updates on the same run loop
_changeSet = nil;
changeSet.animated = animated;
[_dataController updateWithChangeSet:changeSet];
}
}
- (BOOL)isProcessingUpdates
{
return [_dataController isProcessingUpdates];
}
- (void)onDidFinishProcessingUpdates:(void (^)())completion
{
[_dataController onDidFinishProcessingUpdates:completion];
}
- (void)waitUntilAllUpdatesAreCommitted
{
ASDisplayNodeAssertMainThread();
if (_batchUpdateCount > 0) {
// This assertion will be enabled soon.
// ASDisplayNodeFailAssert(@"Should not call %@ during batch update", NSStringFromSelector(_cmd));
return;
}
[_dataController waitUntilAllUpdatesAreProcessed];
}
- (void)layoutSubviews
{
// Remeasure all rows if our row width has changed.
UIEdgeInsets contentInset = self.contentInset;
CGFloat constrainedWidth = self.bounds.size.width - [self sectionIndexWidth] - contentInset.left - contentInset.right;
if (constrainedWidth > 0 && _nodesConstrainedWidth != constrainedWidth) {
_nodesConstrainedWidth = constrainedWidth;
[_cellsForLayoutUpdates removeAllObjects];
[self beginUpdates];
[_dataController relayoutAllNodesWithInvalidationBlock:nil];
[self endUpdatesAnimated:(ASDisplayNodeLayerHasAnimations(self.layer) == NO) completion:nil];
} else {
if (_cellsForLayoutUpdates.count > 0) {
NSArray<ASCellNode *> *nodes = [_cellsForLayoutUpdates allObjects];
[_cellsForLayoutUpdates removeAllObjects];
const auto nodesSizeChanged = [[NSMutableArray<ASCellNode *> alloc] init];
[_dataController relayoutNodes:nodes nodesSizeChanged:nodesSizeChanged];
if (nodesSizeChanged.count > 0) {
[self requeryNodeHeights];
}
}
}
// To ensure _nodesConstrainedWidth is up-to-date for every usage, this call to super must be done last
[super layoutSubviews];
[_rangeController updateIfNeeded];
}
#pragma mark -
#pragma mark Editing
- (void)insertSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (sections.count == 0) { return; }
[self beginUpdates];
[_changeSet insertSections:sections animationOptions:animation];
[self endUpdates];
}
- (void)deleteSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (sections.count == 0) { return; }
[self beginUpdates];
[_changeSet deleteSections:sections animationOptions:animation];
[self endUpdates];
}
- (void)reloadSections:(NSIndexSet *)sections withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (sections.count == 0) { return; }
[self beginUpdates];
[_changeSet reloadSections:sections animationOptions:animation];
[self endUpdates];
}
- (void)moveSection:(NSInteger)section toSection:(NSInteger)newSection
{
ASDisplayNodeAssertMainThread();
[self beginUpdates];
[_changeSet moveSection:section toSection:newSection animationOptions:UITableViewRowAnimationNone];
[self endUpdates];
}
- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (indexPaths.count == 0) { return; }
[self beginUpdates];
[_changeSet insertItems:indexPaths animationOptions:animation];
[self endUpdates];
}
- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (indexPaths.count == 0) { return; }
[self beginUpdates];
[_changeSet deleteItems:indexPaths animationOptions:animation];
[self endUpdates];
}
- (void)reloadRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation
{
ASDisplayNodeAssertMainThread();
if (indexPaths.count == 0) { return; }
[self beginUpdates];
[_changeSet reloadItems:indexPaths animationOptions:animation];
[self endUpdates];
}
- (void)moveRowAtIndexPath:(NSIndexPath *)indexPath toIndexPath:(NSIndexPath *)newIndexPath
{
ASDisplayNodeAssertMainThread();
[self beginUpdates];
[_changeSet moveItemAtIndexPath:indexPath toIndexPath:newIndexPath animationOptions:UITableViewRowAnimationNone];
[self endUpdates];
}
#pragma mark -
#pragma mark adjust content offset
- (void)beginAdjustingContentOffset
{
NSIndexPath *firstVisibleIndexPath = [self.indexPathsForVisibleRows sortedArrayUsingSelector:@selector(compare:)].firstObject;
if (firstVisibleIndexPath) {
ASCellNode *node = [self nodeForRowAtIndexPath:firstVisibleIndexPath];
if (node) {
_contentOffsetAdjustmentTopVisibleNode = node;
_contentOffsetAdjustmentTopVisibleNodeOffset = [self rectForRowAtIndexPath:firstVisibleIndexPath].origin.y - self.bounds.origin.y;
}
}
}
- (void)endAdjustingContentOffsetAnimated:(BOOL)animated
{
// We can't do this for animated updates.
if (animated) {
return;
}
// We can't do this if we didn't have a top visible row before.
if (_contentOffsetAdjustmentTopVisibleNode == nil) {
return;
}
NSIndexPath *newIndexPathForTopVisibleRow = [self indexPathForNode:_contentOffsetAdjustmentTopVisibleNode];
// We can't do this if our top visible row was deleted
if (newIndexPathForTopVisibleRow == nil) {
return;
}
CGFloat newRowOriginYInSelf = [self rectForRowAtIndexPath:newIndexPathForTopVisibleRow].origin.y - self.bounds.origin.y;
CGPoint newContentOffset = self.contentOffset;
newContentOffset.y += (newRowOriginYInSelf - _contentOffsetAdjustmentTopVisibleNodeOffset);
self.contentOffset = newContentOffset;
_contentOffsetAdjustmentTopVisibleNode = nil;
}
#pragma mark - Intercepted selectors
- (void)setTableHeaderView:(UIView *)tableHeaderView
{
// Typically the view will be nil before setting it, but reset state if it is being re-hosted.
[self.tableHeaderView.asyncdisplaykit_node exitHierarchyState:ASHierarchyStateRangeManaged];
[super setTableHeaderView:tableHeaderView];
[self.tableHeaderView.asyncdisplaykit_node enterHierarchyState:ASHierarchyStateRangeManaged];
}
- (void)setTableFooterView:(UIView *)tableFooterView
{
// Typically the view will be nil before setting it, but reset state if it is being re-hosted.
[self.tableFooterView.asyncdisplaykit_node exitHierarchyState:ASHierarchyStateRangeManaged];
[super setTableFooterView:tableFooterView];
[self.tableFooterView.asyncdisplaykit_node enterHierarchyState:ASHierarchyStateRangeManaged];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
_ASTableViewCell *cell = [self dequeueReusableCellWithIdentifier:kCellReuseIdentifier forIndexPath:indexPath];
cell.delegate = self;
ASCollectionElement *element = [_dataController.visibleMap elementForItemAtIndexPath:indexPath];
cell.element = element;
ASCellNode *node = element.node;
if (node) {
[_rangeController configureContentView:cell.contentView forCellNode:node];
}
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
CGFloat height = 0.0;
ASCollectionElement *element = [_dataController.visibleMap elementForItemAtIndexPath:indexPath];
if (element != nil) {
ASCellNode *node = element.node;
ASDisplayNodeAssertNotNil(node, @"Node must not be nil!");
height = [node layoutThatFits:element.constrainedSize].size.height;
}
#if TARGET_OS_IOS
/**
* Weirdly enough, Apple expects the return value here to _include_ the height
* of the separator, if there is one! So if our node wants to be 43.5, we need
* to return 44. UITableView will make a cell of height 44 with a content view
* of height 43.5.
*/
if (tableView.separatorStyle != UITableViewCellSeparatorStyleNone) {
height += 1.0 / ASScreenScale();
}
#endif
return height;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return _dataController.visibleMap.numberOfSections;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [_dataController.visibleMap numberOfItemsInSection:section];
}
- (nullable NSString *)modelIdentifierForElementAtIndexPath:(NSIndexPath *)indexPath inView:(UIView *)view {
if (_asyncDataSourceFlags.modelIdentifierMethods) {
GET_TABLENODE_OR_RETURN(tableNode, nil);
NSIndexPath *convertedPath = [self convertIndexPathToTableNode:indexPath];
if (convertedPath == nil) {
return nil;
} else {
return [_asyncDataSource modelIdentifierForElementAtIndexPath:convertedPath inNode:tableNode];
}
} else {
return nil;
}
}
- (nullable NSIndexPath *)indexPathForElementWithModelIdentifier:(NSString *)identifier inView:(UIView *)view {
if (_asyncDataSourceFlags.modelIdentifierMethods) {
GET_TABLENODE_OR_RETURN(tableNode, nil);
return [_asyncDataSource indexPathForElementWithModelIdentifier:identifier inNode:tableNode];
} else {
return nil;
}
}
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
if (_asyncDataSourceFlags.tableViewCanMoveRow) {
return [_asyncDataSource tableView:self canMoveRowAtIndexPath:indexPath];
} else {
return NO;
}
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
if (_asyncDataSourceFlags.tableViewMoveRow) {
[_asyncDataSource tableView:self moveRowAtIndexPath:sourceIndexPath toIndexPath:destinationIndexPath];
}