StackOverflow2013

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copied!<p>i did the following:</p> <p>AutoSectionTableViewDataSource.h</p> <pre><code>@protocol AutoSectionTableViewDataSource - (NSString*)tableView:(UITableView*)tableView sectionNameAtIndexPath:(NSIndexPath*)indexPath; @end @interface AutoSectionTableViewDataSource : NSObject <UITableViewDataSource> - (id)initWithDataSource:(NSObject<UITableViewDataSource,AutoSectionTableViewDataSource>*)dataSource; @end </code></pre> <p>AutoSectionTableViewDataSource.m</p> <pre><code>@interface AutoSectionTableViewDataSource () @property(weak) NSObject<UITableViewDataSource,AutoSectionTableViewDataSource> *dataSource; @end @implementation AutoSectionTableViewDataSource - (id)initWithDataSource:(NSObject<UITableViewDataSource,AutoSectionTableViewDataSource>*)dataSource { self = [super init]; self.dataSource = dataSource; return self; } - (BOOL)respondsToSelector:(SEL)selector { if ([super respondsToSelector:selector]) return YES; if (self.dataSource && [self.dataSource respondsToSelector:selector]) return YES; return NO; } - (void)forwardInvocation:(NSInvocation*)invocation { if (self.dataSource && [self.dataSource respondsToSelector:invocation.selector]) { [invocation invokeWithTarget:self.dataSource]; } else { [self doesNotRecognizeSelector:invocation.selector]; } } - (NSMethodSignature *)methodSignatureForSelector:(SEL)selector { if (self.dataSource) return [self.dataSource methodSignatureForSelector:selector]; return nil; } - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { NSInteger rows = [self.dataSource tableView:tableView numberOfRowsInSection:0]; NSMutableSet *set = [[NSMutableSet alloc] init]; for (NSInteger row=0; row<rows; row++) { NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:0]; NSString* sectionName = [self.dataSource tableView:tableView sectionNameAtIndexPath:indexPath]; [set addObject:sectionName]; } return set.count; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { NSInteger rows = [self.dataSource tableView:tableView numberOfRowsInSection:0]; NSMutableDictionary *tmp = [[NSMutableDictionary alloc] init]; NSInteger count = 0; for (NSInteger row=0; row<rows; row++) { NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:0]; NSString* sectionName = [self.dataSource tableView:tableView sectionNameAtIndexPath:indexPath]; if (!tmp[sectionName]) { tmp[sectionName] = @(tmp.count); } if ([tmp[sectionName] intValue] == section) { count++; } } return count; } - (NSString*)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { NSInteger rows = [self.dataSource tableView:tableView numberOfRowsInSection:0]; NSMutableSet *set = [[NSMutableSet alloc] init]; for (NSInteger row=0; row<rows; row++) { NSIndexPath *indexPath = [NSIndexPath indexPathForRow:row inSection:0]; NSString* sectionName = [self.dataSource tableView:tableView sectionNameAtIndexPath:indexPath]; if (![set containsObject:sectionName]) { [set addObject:sectionName]; if (set.count - 1 == section) { //NSLog(@"AutoSectionTableViewDataSource titleForHeaderInSection:%d -> %@", section, sectionName); return sectionName; } } } return nil; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { NSInteger rows = [self.dataSource tableView:tableView numberOfRowsInSection:0]; NSMutableDictionary *tmp = [[NSMutableDictionary alloc] init]; NSInteger count = 0; for (NSInteger row=0; row<rows; row++) { NSIndexPath *rowIndexPath = [NSIndexPath indexPathForRow:row inSection:0]; NSString* sectionName = [self.dataSource tableView:tableView sectionNameAtIndexPath:rowIndexPath]; if (!tmp[sectionName]) { tmp[sectionName] = @(tmp.count); } if ([tmp[sectionName] intValue] == indexPath.section) { count++; if (count-1 == indexPath.row) { UITableViewCell *cell = [self.dataSource tableView:tableView cellForRowAtIndexPath:rowIndexPath]; return cell; } } } return nil; } @end </code></pre> <p>and then in your code:</p> <pre><code>- (NSString*)tableView:(UITableView *)tableView sectionNameAtIndexPath:(NSIndexPath *)indexPath { return @"this would be your section name for indexPath.row" } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return total_number_of_rows; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { return cell_for_indexPath.row; } - (void)viewDidLoad { [super viewDidLoad]; // instead of self.tableView.dataSource = self; use: self.autoSectionDataSource = [[AutoSectionTableViewDataSource alloc] initWithDataSource:self]; self.tableView.dataSource = self.autoSectionDataSource; } </code></pre>

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