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Add ADBIndexedTableView component and demo project
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| # Xcode | ||
| build/* | ||
| *.pbxuser | ||
| !default.pbxuser | ||
| *.mode1v3 | ||
| !default.mode1v3 | ||
| *.mode2v3 | ||
| !default.mode2v3 | ||
| *.perspectivev3 | ||
| !default.perspectivev3 | ||
| *.xcworkspace | ||
| !default.xcworkspace | ||
| xcuserdata | ||
| profile | ||
| *.moved-aside | ||
| .DS_Store | ||
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| // | ||
| // ADBIndexedTableView.h | ||
| // PassDesk | ||
| // | ||
| // Created by Alberto De Bortoli on 11/4/12. | ||
| // Copyright (c) 2012 Alberto De Bortoli. All rights reserved. | ||
| // | ||
| // ADBIndexedTableView inherits from UITableView (use it as a UITableView). | ||
| // | ||
| // 1. Set up delegate and dataSource as usual (using Interface Builder or programmatically). | ||
| // 2. Set indexDataSource and implement 'objectsFieldForIndexedTableView:' method | ||
| // (used for sorting and indexing). | ||
| // 3. dataSource 'tableView:cellForRowAtIndexPath' implementation can retrieve object for | ||
| // the given indexPath using 'objectAtIndexPath:' method. | ||
| // 4. Implementing 'indexedTableView:cellForRowAtIndexPath:objectAtIndexPath:' is required | ||
| // and it will be used only if 'tableView:cellForRowAtIndexPath' implementation is not | ||
| // provided by the dataSource. | ||
| // 5. Reload the table sending unsorted objects via 'reloadDataWithObjects:' method to let | ||
| // indexedTableView create the data structure. Use 'reloadData' for subsequent reloadings. | ||
| // | ||
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| #import <UIKit/UIKit.h> | ||
| #import "ADBMessageInterceptor.h" | ||
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| @class ADBIndexedTableView; | ||
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| @protocol ADBIndexedTableViewDataSource <NSObject> | ||
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| @required | ||
| /** | ||
| @return field used to retrieve the first letter (used for index) | ||
| @param tableView, the caller | ||
| Return value will be used for KVC on 'indexedObjects' objects | ||
| */ | ||
| - (NSString *)objectsFieldForIndexedTableView:(ADBIndexedTableView *)tableView; | ||
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| @optional | ||
| /** | ||
| @return cell for row at index path | ||
| @param tableView, the caller | ||
| @param indexPath, the indexPath | ||
| @param object, the object at indexPath | ||
| Surrogate method for dataSource method 'tableView:cellForRowAtIndexPath:' | ||
| Required only if 'tableView:cellForRowAtIndexPath' implementation is not provided by dataSource. | ||
| */ | ||
| - (UITableViewCell *)indexedTableView:(ADBIndexedTableView *)tableView | ||
| cellForRowAtIndexPath:(NSIndexPath *)indexPath | ||
| objectAtIndexPath:(id)object; | ||
| @end | ||
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| @interface ADBIndexedTableView : UITableView { | ||
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| @private | ||
| NSMutableDictionary *_indexedObjects; | ||
| NSArray *_objectsInitials; | ||
| ADBMessageInterceptor *_dataSourceInterceptor; | ||
| id <ADBIndexedTableViewDataSource> __weak _indexDataSource; | ||
| } | ||
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| /** | ||
| @param objects, array of objects that will be organized in sections | ||
| Surrogate method for 'reloadData', creates data structure and calls 'reloadData' on super | ||
| Subsequent 'reloadData' messages use previously created data structure. | ||
| */ | ||
| - (void)reloadDataWithObjects:(NSArray *)objects; | ||
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| - (id)objectAtIndexPath:(NSIndexPath *)indexPath; | ||
| - (void)removeObjectAtIndexPath:(NSIndexPath *)indexPath; | ||
| - (id)objectsWithInitials:(NSString *)initial; | ||
| - (id)objectsInSection:(NSUInteger)section; | ||
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| @property (nonatomic, strong) NSMutableDictionary *indexedObjects; | ||
| @property (nonatomic, strong) NSArray *objectsInitials; | ||
| @property (nonatomic, weak) IBOutlet id <ADBIndexedTableViewDataSource> indexDataSource; | ||
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| @end |
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| // | ||
| // ADBIndexedTableView.m | ||
| // PassDesk | ||
| // | ||
| // Created by Alberto De Bortoli on 11/4/12. | ||
| // Copyright (c) 2012 Alberto De Bortoli. All rights reserved. | ||
| // | ||
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| #import "ADBIndexedTableView.h" | ||
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| @implementation ADBIndexedTableView | ||
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| #pragma mark - Message forwarding | ||
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| - (id <UITableViewDataSource>)dataSource | ||
| { | ||
| return (id <UITableViewDataSource>)_dataSourceInterceptor; | ||
| } | ||
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| - (void)setDataSource:(id <UITableViewDataSource>)dataSource | ||
| { | ||
| [super setDataSource:nil]; | ||
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| _dataSourceInterceptor = [[ADBMessageInterceptor alloc] init]; | ||
| [_dataSourceInterceptor setReceiver:dataSource]; | ||
| [_dataSourceInterceptor setSecondChance:self]; | ||
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| [super setDataSource:(id)_dataSourceInterceptor]; | ||
| } | ||
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| #pragma mark - Core | ||
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| - (void)reloadDataWithObjects:(NSArray *)objects | ||
| { | ||
| NSString *field = [_indexDataSource objectsFieldForIndexedTableView:self]; | ||
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| NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:field ascending:YES]; | ||
| objects = [objects sortedArrayUsingDescriptors:@[sortDescriptor]]; | ||
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| // calculate needed initials | ||
| NSMutableArray *initials = [NSMutableArray array]; | ||
| for (NSString *property in [objects valueForKey:field]) { | ||
| if ([property length]) { | ||
| NSString *initial = [[property substringToIndex:1] capitalizedString]; | ||
| if (![initials containsObject:initial]) { | ||
| [initials addObject:initial]; | ||
| } | ||
| } | ||
| } | ||
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| _objectsInitials = initials; | ||
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| _indexedObjects = [NSMutableDictionary dictionary]; | ||
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| // create dictionary with objects grouped for initial | ||
| for (NSString *initial in _objectsInitials) { | ||
| NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.%@ beginswith[cd] %@", field, initial]; | ||
| NSArray *filteredForInitial = [objects filteredArrayUsingPredicate:predicate]; | ||
| [_indexedObjects setObject:filteredForInitial forKey:initial]; | ||
| } | ||
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| [self reloadData]; | ||
| } | ||
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| - (id)objectAtIndexPath:(NSIndexPath *)indexPath | ||
| { | ||
| NSString *initial = self.objectsInitials[indexPath.section]; | ||
| return self.indexedObjects[initial][indexPath.row]; | ||
| } | ||
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| - (void)removeObjectAtIndexPath:(NSIndexPath *)indexPath | ||
| { | ||
| NSString *initial = self.objectsInitials[indexPath.section]; | ||
| NSMutableArray *objectsForGivenInitial = [self.indexedObjects[initial] mutableCopy]; | ||
| [objectsForGivenInitial removeObjectAtIndex:indexPath.row]; | ||
| [self.indexedObjects setObject:objectsForGivenInitial forKey:initial]; | ||
| [self deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationRight]; | ||
| } | ||
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| - (id)objectsWithInitials:(NSString *)initial | ||
| { | ||
| NSArray *retVal = _indexedObjects[[initial uppercaseString]]; | ||
| return retVal; | ||
| } | ||
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| - (id)objectsInSection:(NSUInteger)section | ||
| { | ||
| NSString *initial = [_objectsInitials objectAtIndex:section]; | ||
| NSArray *retVal = _indexedObjects[initial]; | ||
| return retVal; | ||
| } | ||
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| #pragma mark - UITableViewDatasource | ||
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| - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView | ||
| { | ||
| return [_objectsInitials count]; | ||
| } | ||
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| - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section | ||
| { | ||
| NSString *initial = _objectsInitials[section]; | ||
| return [_indexedObjects[initial] count]; | ||
| } | ||
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| - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section | ||
| { | ||
| return _objectsInitials[section]; | ||
| } | ||
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| - (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView | ||
| { | ||
| return _objectsInitials; | ||
| } | ||
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| - (NSInteger)tableView:(UITableView *)tableView | ||
| sectionForSectionIndexTitle:(NSString *)title | ||
| atIndex:(NSInteger)index | ||
| { | ||
| return [_objectsInitials indexOfObject:title]; | ||
| } | ||
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| - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath | ||
| { | ||
| id objectAtIndexPath = [self objectAtIndexPath:indexPath]; | ||
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| UITableViewCell *cell = nil; | ||
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| // since 'indexedTableView:cellForRowAtIndexPath:objectAtIndexPath:' is marked ad @optional | ||
| // we should check if indexDataSource responds to it, but if we get here dataSource does not implement | ||
| // 'tableView:cellForRowAtIndexPath:' and so indexDataSource must implement | ||
| // 'indexedTableView:cellForRowAtIndexPath:objectAtIndexPath:' (required in this scenario) | ||
| cell = [_indexDataSource indexedTableView:self | ||
| cellForRowAtIndexPath:indexPath | ||
| objectAtIndexPath:objectAtIndexPath]; | ||
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| return cell; | ||
| } | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,55 @@ | ||
| // | ||
| // ADBMessageInterceptor.h | ||
| // PassDesk | ||
| // | ||
| // Created by Alberto De Bortoli on 11/4/12. | ||
| // Copyright (c) 2012 Alberto De Bortoli. All rights reserved. | ||
| // | ||
| // MessageInterceptor, proxy class to handle message forwarding. | ||
| // | ||
| // If you set a message inspector as a delegate object (for your delegating object) | ||
| // it will check if the real delegate (receiver) can respond to the message, otherwise | ||
| // it will check if the surrogate delegate (secondChance) can handle the message. | ||
| // If both tests fail, a check on super (NSObject) will be performed as last wish. | ||
| // | ||
| // Useful to let a class (instance I) implement some delegate methods and to let the | ||
| // rest of the delegate methods be implemented by the real delegate (R). | ||
| // In this scenario receiver must be the real delegate (R) and mainInTheMiddle must be the class object (I). | ||
| // | ||
| // Classes that encapsulate a interceptor must: | ||
| // 1. hold a ADBMessageInterceptor *iVar (here named _delegateInterceptor) | ||
| // 2. implement the following methods | ||
| // | ||
| // example given using UITableViewDelegate | ||
| // | ||
| // #pragma mark - Message forwarding | ||
| // | ||
| // - (id <UITableViewDelegate>)delegate | ||
| // { | ||
| // return (id <UITableViewDelegate>)_delegateInterceptor; | ||
| // } | ||
| // | ||
| // - (void)setDelegate:(id <UITableViewDelegate>)delegate | ||
| // { | ||
| // [super setDelegate:nil]; | ||
| // | ||
| // _delegateInterceptor = [[ADBMessageInterceptor alloc] init]; | ||
| // [_delegateInterceptor setSecondChance:self]; | ||
| // [_delegateInterceptor setReceiver:delegate]; | ||
| // | ||
| // [super setDelegate:(id)_delegateInterceptor]; | ||
| // } | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
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| @interface ADBMessageInterceptor : NSObject { | ||
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| id __weak _receiver; | ||
| id __weak _secondChance; | ||
| } | ||
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| @property (nonatomic, weak) id receiver; | ||
| @property (nonatomic, weak) id secondChance; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| // | ||
| // ADBMessageInterceptor.m | ||
| // PassDesk | ||
| // | ||
| // Created by Alberto De Bortoli on 11/4/12. | ||
| // Copyright (c) 2012 Alberto De Bortoli. All rights reserved. | ||
| // | ||
|
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| #import "ADBMessageInterceptor.h" | ||
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| @implementation ADBMessageInterceptor | ||
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| - (id)forwardingTargetForSelector:(SEL)aSelector | ||
| { | ||
| if ([_receiver respondsToSelector:aSelector]) { | ||
| return _receiver; | ||
| } | ||
| if ([_secondChance respondsToSelector:aSelector]) { | ||
| return _secondChance; | ||
| } | ||
| return [super forwardingTargetForSelector:aSelector]; | ||
| } | ||
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| - (BOOL)respondsToSelector:(SEL)aSelector | ||
| { | ||
| if ([_receiver respondsToSelector:aSelector]) { | ||
| return YES; | ||
| } | ||
| if ([_secondChance respondsToSelector:aSelector]) { | ||
| return YES; | ||
| } | ||
| return [super respondsToSelector:aSelector]; | ||
| } | ||
|
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| @end |
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