UITableView: hide header from empty section

Question

i have a UITableView, that displays expenses from a current month (see screenshot):

My problem is with the header for empty sections. is there any way to hide them? The data is loaded from coredata.

this is the code that generates the header title:

TitleForHeader

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{ if ([tableView.dataSource tableView:tableView numberOfRowsInSection:section] == 0) {     return nil; } else {  NSDate *today = [NSDate date ]; int todayInt = [dataHandler getDayNumber:today].intValue;  NSDate *date = [NSDate dateWithTimeIntervalSinceNow:(-(todayInt-section-1)*60*60*24)]; NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:[[NSLocale preferredLanguages] objectAtIndex:0]]];     [dateFormatter setTimeStyle:NSDateFormatterNoStyle]; [dateFormatter setDateStyle:NSDateFormatterMediumStyle]; NSString *formattedDateString = [dateFormatter stringFromDate:date];     return formattedDateString;}  } 

ViewForHeader

-(UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{ if ([tableView.dataSource tableView:tableView numberOfRowsInSection:section] == 0) {     return nil; } else {      UIView *headerView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 312, 30)];     UILabel *title = [[UILabel alloc]initWithFrame:CGRectMake(4, 9, 312, 20)];     UIView *top = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 312, 5)];     UIView *bottom = [[UIView alloc]initWithFrame:CGRectMake(0, 5, 312, 1)];      [top setBackgroundColor:[UIColor lightGrayColor]];     [bottom setBackgroundColor:[UIColor lightGrayColor]];      [title setText:[expenseTable.dataSource tableView:tableView titleForHeaderInSection:section]];     [title setTextColor:[UIColor darkGrayColor]];     UIFont *fontName = [UIFont fontWithName:@"Cochin-Bold" size:15.0];     [title setFont:fontName];       [headerView addSubview:title];     [headerView addSubview:top];     [headerView addSubview:bottom];      return headerView;  }  } 

heightForHeader

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {  NSLog(@"Height: %d",[tableView.dataSource tableView:tableView numberOfRowsInSection:section] == 0); if ([tableView.dataSource tableView:tableView numberOfRowsInSection:section == 0]) {     return 0; } else {     return 30; } } 

numberOfRowsInSection

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section  {  int rows = 0; for (Expense* exp in [dataHandler allMonthExpenses]) {     if ([exp day].intValue == section) {         rows++;     } }  return rows; } 

sebastian

Answer 1

You have to set tableView:heightForHeaderInSection: to 0 for the appropriate sections. This is something which changed fairly recently and got me in a couple places. From UITableViewDelegate it says...

Prior to iOS 5.0, table views would automatically resize the heights of headers to 0 for sections where tableView:viewForHeaderInSection: returned a nil view. In iOS 5.0 and later, you must return the actual height for each section header in this method.

So you'll have to do something like

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {     if ([tableView.dataSource tableView:tableView numberOfRowsInSection:section] == 0) {         return 0;     } else {         // whatever height you'd want for a real section header     } }