Chainable datasource
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The document discusses managing UITableView updates using a chainable data source approach, outlining methods for handling row deletions, insertions, and animations while maintaining data integrity. It highlights common challenges developers face regarding inconsistent data states and offers strategies to ensure correct updates. Additionally, it provides code snippets showcasing the integration of various data source methods for an efficient UITableView implementation.
![@ * [ : ] ;
Disclaimer
🍓](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-2-320.jpg)
![- (UITableViewCell*) tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell* cell = [tableView
dequeueReusableCellWithIdentifier:@"fruit-cell"
forIndexPath:indexPath];
Fruit* fruit = self.fruits[0];
cell.titleLabel.text = fruit.name;
return cell;
}
😎](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-4-320.jpg)
![Animations 😍
[tableView beginUpdates];
[self.fruits removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView endUpdates];](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-5-320.jpg)
![//Controller
- (UITableViewCell*) tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell* cell = [tableView
dequeueReusableCellWithIdentifier:@"fruit-cell"
forIndexPath:indexPath];
Fruit* fruit = self.fruits[0]; //Model
cell.titleLabel.text = fruit.name; //View
return cell;
}
🤓](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-6-320.jpg)
![- (UITableViewCell*) tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
FruitCell* cell = (FruitCell*)[tableView
dequeueReusableCellWithIdentifier:@"fruit-cell"
forIndexPath:indexPath];
cell.fruit = fruit;
return cell;
}
🤔](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-7-320.jpg)
![- (UITableViewCell*) tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == FRUIT_SECTION) {
UITableViewCell* cell = [tableView
dequeueReusableCellWithIdentifier:@"fruit-cell"
forIndexPath:indexPath];
Fruit* fruit = self.fruits[0];
cell.titleLabel.text = fruit.name;
return cell;
} else if (indexPath.section == VEGETABLE_SECTION) {
UITableViewCell* cell = [tableView
dequeueReusableCellWithIdentifier:@"veg-cell"
forIndexPath:indexPath];
...
😒](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-8-320.jpg)
![- (UITableViewCell*) tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
switch (indexPath.section) {
case FRUIT_SECTION: {
UITableViewCell* cell = [tableView
dequeueReusableCellWithIdentifier:@"fruit-cell"
forIndexPath:indexPath];
Fruit* fruit = self.fruits[0];
cell.titleLabel.text = fruit.name;
return cell;
} break;
case VEGETABLE_SECTION: {
...
😟](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-9-320.jpg)
![- (UITableViewCell*) tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == AD_SECTION &&
indexPath.row == AD_ROW) {
return [tableView
dequeueReusableCellWithIdentifier:@"ad-cell"
forIndexPath:indexPath];
}
indexPath = [self offsetIndexPath:indexPath
ifAfter:AD_INDEX_PATH];
switch (indexPath.section) {
case FRUIT_SECTION: {
UITableViewCell* cell = [tableView
dequeueReusableCellWithIdentifier:@"fruit-cell"
forIndexPath:indexPath];
...
😨](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-10-320.jpg)
![- (UITableViewCell*) tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == AD_SECTION &&
indexPath.row == AD_ROW &&
self.isAdLoaded) {
return [tableView
dequeueReusableCellWithIdentifier:@"ad-cell"
forIndexPath:indexPath];
}
indexPath = [self offsetIndexPath:indexPath
ifAfter:AD_INDEX_PATH];
switch (indexPath.section) {
case FRUIT_SECTION: {
UITableViewCell* cell = [tableView
dequeueReusableCellWithIdentifier:@"fruit-cell"
forIndexPath:indexPath];
...
😰](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-11-320.jpg)
![Animations 😱
2016-09-06 14:07:23.167 MyBeautifulTableView[89346:883532] *** Terminating app due to
uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid
number of rows in section 0. The number of rows contained in an existing section after the
update (1) must be equal to the number of rows contained in that section before the update
(9), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0
deleted) and plus or minus the number of rows moved into or out of that section (0 moved
in, 0 moved out).'
*** First throw call stack:
(
0 CoreFoundation 0x000000010eba034b __exceptionPreprocess + 171
1 libobjc.A.dylib 0x000000010e60121e objc_exception_throw + 48
2 CoreFoundation 0x000000010eba4442 +[NSException
raise:format:arguments:] + 98
3 Foundation 0x0000000109620edd -[NSAssertionHandler
handleFailureInMethod:object:file:lineNumber:description:] + 195
4 UIKit 0x000000010c2172f4 -[UITableView
_endCellAnimationsWithContext:] + 17558
...](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-12-320.jpg)
![[tableView reloadData];
😢](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-13-320.jpg)
![[tableView beginUpdates];
[self.fruits removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView endUpdates];
//OK
The truth about updates](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-43-320.jpg)
![[tableView beginUpdates];
[self.fruits removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView deleteRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView deleteRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView deleteRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationAutomatic];
[tableView endUpdates];
//Still OK
The truth about updates](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-44-320.jpg)
![CellDataSource
- (NSString*) cellIdentifierForObject:(id)object
{
return NSStringFromClass([object class]);
}
- (void) configureCell:(UITableViewCell*)cell withObject:(id)object
{
if ([cell.reuseIdentifier isEqual:@"Fruit"]) {
//...
} else if ([cell.reuseIdentifier isEqual:@"Vegetable"]) {
//...
}
// 😢
}](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-64-320.jpg)
![- (void) forwardInvocation:(NSInvocation *)anInvocation
{
if ([self isForwardableDelegateSelector:anInvocation.selector]) {
NSMethodSignature* signature = anInvocation.methodSignature;
NSArray* components = [NSStringFromSelector(anInvocation.selector)componentsSeparatedByString:@":"];
for (NSInteger argIndex = 0; argIndex < signature.numberOfArguments; argIndex++) {
//skip self and cmd
if (argIndex < 2) {
continue;
}
//won't work with targetIndexPathForMoveFromRowAtIndexPath, since two indexPath are present
const char* argType = [signature getArgumentTypeAtIndex:argIndex];
if (strcmp(argType, @encode(NSIndexPath*)) == 0) {
__unsafe_unretained id arg;
[anInvocation getArgument:&arg atIndex:argIndex];
if ([arg isKindOfClass:[NSIndexPath class]]) {
NSIndexPath* indexPath = arg;
NSIndexPath* fullIndexPath = [self sourceIndexPathForIndexPath:indexPath];
id<ChainableDataSource> dataSource = self.dataSources[[fullIndexPath indexAtPosition:0]];
NSIndexPath* dsIndexPath = [NSIndexPath indexPathForRow:[fullIndexPath indexAtPosition:2] inSection:
[fullIndexPath indexAtPosition:1]];
[anInvocation setArgument:&dsIndexPath atIndex:argIndex];
if ([dataSource respondsToSelector:anInvocation.selector]) {
[anInvocation invokeWithTarget:dataSource];
}
return;
}
} else if (strcmp(argType, @encode(NSInteger)) == 0 && [components[argIndex-2] hasSuffix:@"Section"]) {
NSInteger section;
[anInvocation getArgument:§ion atIndex:argIndex];
NSIndexPath* sourceSectionIndexPath = [self sourceSectionIndexPathForSectionIndex:section];
if (sourceSectionIndexPath) {
id<ChainableDataSource> dataSource = self.dataSources[[sourceSectionIndexPath indexAtPosition:0]];
NSInteger sourceSection = [sourceSectionIndexPath indexAtPosition:1];
[anInvocation setArgument:&sourceSection atIndex:argIndex];
if ([dataSource respondsToSelector:anInvocation.selector]) {
[anInvocation invokeWithTarget:dataSource];
}
}
return;
}
}
return;
}
return [super forwardInvocation:anInvocation];
}](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-69-320.jpg)
![CellDataSource
@implementation FruitCellDataSource
- (NSString*) cellIdentifierForObject:(id)object
{
return @"fruit-cell";
}
- (void) configureCell:(UITableViewCell*)cell withObject:(id)object
{
Fruit* fruit = object;
cell.titleLabel.text = fruit.name;
}
- (void) tableView:(UITableView *)tableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
Fruit* fruit = [self.objectsDataSource
dataSourceObjectAtIndexPath:indexPath];
//...
}
@end](https://image.slidesharecdn.com/chainabledatasource-160925173009/85/Chainable-datasource-71-320.jpg)
Chainable datasource
- 1. Chainable Data Sources or how I stopped worrying and started abusing table view updates Amadour Griffais CocoaHeads Paris – 8 September 2016
- 2. @ * [ : ] ; Disclaimer 🍓
- 4. - (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"fruit-cell" forIndexPath:indexPath]; Fruit* fruit = self.fruits[0]; cell.titleLabel.text = fruit.name; return cell; } 😎
- 5. Animations 😍 [tableView beginUpdates]; [self.fruits removeObjectAtIndex:indexPath.row]; [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; [tableView endUpdates];
- 6. //Controller - (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"fruit-cell" forIndexPath:indexPath]; Fruit* fruit = self.fruits[0]; //Model cell.titleLabel.text = fruit.name; //View return cell; } 🤓
- 7. - (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { FruitCell* cell = (FruitCell*)[tableView dequeueReusableCellWithIdentifier:@"fruit-cell" forIndexPath:indexPath]; cell.fruit = fruit; return cell; } 🤔
- 8. - (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { if (indexPath.section == FRUIT_SECTION) { UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"fruit-cell" forIndexPath:indexPath]; Fruit* fruit = self.fruits[0]; cell.titleLabel.text = fruit.name; return cell; } else if (indexPath.section == VEGETABLE_SECTION) { UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"veg-cell" forIndexPath:indexPath]; ... 😒
- 9. - (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { switch (indexPath.section) { case FRUIT_SECTION: { UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"fruit-cell" forIndexPath:indexPath]; Fruit* fruit = self.fruits[0]; cell.titleLabel.text = fruit.name; return cell; } break; case VEGETABLE_SECTION: { ... 😟
- 10. - (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { if (indexPath.section == AD_SECTION && indexPath.row == AD_ROW) { return [tableView dequeueReusableCellWithIdentifier:@"ad-cell" forIndexPath:indexPath]; } indexPath = [self offsetIndexPath:indexPath ifAfter:AD_INDEX_PATH]; switch (indexPath.section) { case FRUIT_SECTION: { UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"fruit-cell" forIndexPath:indexPath]; ... 😨
- 11. - (UITableViewCell*) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { if (indexPath.section == AD_SECTION && indexPath.row == AD_ROW && self.isAdLoaded) { return [tableView dequeueReusableCellWithIdentifier:@"ad-cell" forIndexPath:indexPath]; } indexPath = [self offsetIndexPath:indexPath ifAfter:AD_INDEX_PATH]; switch (indexPath.section) { case FRUIT_SECTION: { UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"fruit-cell" forIndexPath:indexPath]; ... 😰
- 12. Animations 😱 2016-09-06 14:07:23.167 MyBeautifulTableView[89346:883532] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0. The number of rows contained in an existing section after the update (1) must be equal to the number of rows contained in that section before the update (9), plus or minus the number of rows inserted or deleted from that section (0 inserted, 0 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).' *** First throw call stack: ( 0 CoreFoundation 0x000000010eba034b __exceptionPreprocess + 171 1 libobjc.A.dylib 0x000000010e60121e objc_exception_throw + 48 2 CoreFoundation 0x000000010eba4442 +[NSException raise:format:arguments:] + 98 3 Foundation 0x0000000109620edd -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195 4 UIKit 0x000000010c2172f4 -[UITableView _endCellAnimationsWithContext:] + 17558 ...
- 20. @protocol ChainableDataSource <NSObject> - (NSInteger) numberOfSectionsInDataSource; - (NSInteger) numberOfObjectsInDataSourceSection:(NSInteger)section; - (id) dataSourceObjectAtIndexPath:(NSIndexPath*)indexPath; - (NSString*) nameForDataSourceSectionAtIndex:(NSInteger)section; @property (weak) id<ChainableDataSourceDelegate> dataSourceDelegate; @end
- 21. 🍓 🍆 💵 M
- 25. 🍓 CellDataSource
- 26. 🍓 CellDataSource @interface CellDataSource : NSObject <ChainableDataSource, UITableViewDataSource> - (NSString*) cellIdentifierForObject:(id)object; - (void) configureCell:(UIView<GenericCell>*)cell withObject:(id)object;
- 28. + <
- 31. @interface TransformDataSource : NSObject <ChainableDataSource> @property (nonatomic, copy) NSArray<id<ChainableDataSource>>* dataSources; - (NSIndexPath*) sourceIndexPathForIndexPath:(NSIndexPath*)indexPath; - (NSIndexPath*) indexPathForSourceIndexPath:(NSIndexPath*)sourceIndexPath inDataSource:(id<ChainableDataSource>)sourceDataSource; - (NSInteger) sectionIndexForSourceSectionIndex:(NSInteger)sourceSection inDataSource:(id<ChainableDataSource>)sourceDataSource; - (NSIndexPath*) sourceSectionIndexPathForSectionIndex:(NSInteger)section; @end
- 34. < TransformDataSource <#YourChainableDataSource#> ConcatenatedSectionsDataSource InsertionDataSource
- 36. Updates
- 39. @protocol ChainableDataSourceDelegate <NSObject> - (void) dataSourceDidReload:(id<ChainableDataSource>)dataSource; - (void) dataSourceWillUpdate:(id<ChainableDataSource>)dataSource; - (void) dataSourceDidUpdate:(id<ChainableDataSource>)dataSource; - (void) dataSource:(id<ChainableDataSource>)dataSource didDeleteSectionsAtIndexes:(NSIndexSet*)sectionIndexes; - (void) dataSource:(id<ChainableDataSource>)dataSource didInsertSectionsAtIndexes:(NSIndexSet*)sectionIndexes; - (void) dataSource:(id<ChainableDataSource>)dataSource didDeleteObjectsAtIndexPaths:(NSArray<NSIndexPath*>*)indexPath; - (void) dataSource:(id<ChainableDataSource>)dataSource didInsertObjectsAtIndexPaths:(NSArray<NSIndexPath*>*)indexPath; - (void) dataSource:(id<ChainableDataSource>)dataSource didUpdateObjectsAtIndexPaths:(NSArray<NSIndexPath*>*)indexPath; @end
- 40. A B E D C F A C H D G The truth about updates
- 41. A B E D C F A C H D G The truth about updates delete: 1, 4, 5 insert: 2, 4
- 42. A B E D C F A C H D G The truth about updates update: 1
- 43. [tableView beginUpdates]; [self.fruits removeObjectAtIndex:indexPath.row]; [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; [tableView endUpdates]; //OK The truth about updates
- 44. [tableView beginUpdates]; [self.fruits removeObjectAtIndex:indexPath.row]; [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; [tableView endUpdates]; //Still OK The truth about updates
- 46. 🍓 🍓 🍆 🍓 💵 🍆 UITableView <ChainableDataSourceDelegate> UICollectionView <ChainableDataSourceDelegate>
- 48. CellDataSource didUpdateObjectsAtIndexPaths -> configureCell:withObject: everything else -> forward
- 52. + < basic mapping -> automatic TransformDataSource
- 53. TransformDataSource advanced mapping: tweak update set pre and post upstream updates - (void) preRefreshTranslateSourceUpdateCache:(UpdateCache*)sourceUpdateCache fromDataSource:(id<ChainableDataSource>)dataSource toUpdateCache:(UpdateCache*)updateCache; - (void) postRefreshTranslateSourceUpdateCache:(UpdateCache*)sourceUpdateCache fromDataSource:(id<ChainableDataSource>)dataSource toUpdateCache:(UpdateCache*)updateCache;
- 59. A B E D C F A C H D G delete: 1, 4, 5 insert: 2, 4 diff algorithm Longest Common Subsequence
- 64. CellDataSource - (NSString*) cellIdentifierForObject:(id)object { return NSStringFromClass([object class]); } - (void) configureCell:(UITableViewCell*)cell withObject:(id)object { if ([cell.reuseIdentifier isEqual:@"Fruit"]) { //... } else if ([cell.reuseIdentifier isEqual:@"Vegetable"]) { //... } // 😢 }
- 67. 🍓 🍆 + 💵 < 🍓 🍓 🍆 🍓 💵 🍆 TransformDataSource (CellDataSource) forward delegate/data source methods based on index mapping
- 68. TransformDataSource (CellDataSource) forward delegate/data source methods based on index mapping (My dirty secret)
- 69. - (void) forwardInvocation:(NSInvocation *)anInvocation { if ([self isForwardableDelegateSelector:anInvocation.selector]) { NSMethodSignature* signature = anInvocation.methodSignature; NSArray* components = [NSStringFromSelector(anInvocation.selector)componentsSeparatedByString:@":"]; for (NSInteger argIndex = 0; argIndex < signature.numberOfArguments; argIndex++) { //skip self and cmd if (argIndex < 2) { continue; } //won't work with targetIndexPathForMoveFromRowAtIndexPath, since two indexPath are present const char* argType = [signature getArgumentTypeAtIndex:argIndex]; if (strcmp(argType, @encode(NSIndexPath*)) == 0) { __unsafe_unretained id arg; [anInvocation getArgument:&arg atIndex:argIndex]; if ([arg isKindOfClass:[NSIndexPath class]]) { NSIndexPath* indexPath = arg; NSIndexPath* fullIndexPath = [self sourceIndexPathForIndexPath:indexPath]; id<ChainableDataSource> dataSource = self.dataSources[[fullIndexPath indexAtPosition:0]]; NSIndexPath* dsIndexPath = [NSIndexPath indexPathForRow:[fullIndexPath indexAtPosition:2] inSection: [fullIndexPath indexAtPosition:1]]; [anInvocation setArgument:&dsIndexPath atIndex:argIndex]; if ([dataSource respondsToSelector:anInvocation.selector]) { [anInvocation invokeWithTarget:dataSource]; } return; } } else if (strcmp(argType, @encode(NSInteger)) == 0 && [components[argIndex-2] hasSuffix:@"Section"]) { NSInteger section; [anInvocation getArgument:§ion atIndex:argIndex]; NSIndexPath* sourceSectionIndexPath = [self sourceSectionIndexPathForSectionIndex:section]; if (sourceSectionIndexPath) { id<ChainableDataSource> dataSource = self.dataSources[[sourceSectionIndexPath indexAtPosition:0]]; NSInteger sourceSection = [sourceSectionIndexPath indexAtPosition:1]; [anInvocation setArgument:&sourceSection atIndex:argIndex]; if ([dataSource respondsToSelector:anInvocation.selector]) { [anInvocation invokeWithTarget:dataSource]; } } return; } } return; } return [super forwardInvocation:anInvocation]; }
- 71. CellDataSource @implementation FruitCellDataSource - (NSString*) cellIdentifierForObject:(id)object { return @"fruit-cell"; } - (void) configureCell:(UITableViewCell*)cell withObject:(id)object { Fruit* fruit = object; cell.titleLabel.text = fruit.name; } - (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { Fruit* fruit = [self.objectsDataSource dataSourceObjectAtIndexPath:indexPath]; //... } @end
- 73. Demo
- 74. Open source*
- 75. *before this holiday season Open source*
- 76. ? amadour