Multiple sections in UITableView - objective-c

Question

Actually i'm using only one section. I sort my data stored in core data by date.
I want to have two sections (latest and history). In my first section "latest" I want to put my latest date and in the other section "history" i want to put other dates sorted by date.
My table is editable and I'm using NSFetchedResultsController.
Here is my sample code for numberOfRowsInSection:
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc]init];
[fetchRequest setEntity:[NSEntityDescription entityForName:#"Info"
inManagedObjectContext:self.managedObjectContext]];
// Define how we want our entities to be sorted
NSSortDescriptor* sortDescriptor = [[[NSSortDescriptor alloc]
initWithKey:#"date" ascending:NO] autorelease];
NSArray* sortDescriptors = [[[NSArray alloc] initWithObjects:sortDescriptor, nil] autorelease];
[fetchRequest setSortDescriptors:sortDescriptors];
NSString *lower = [mxData.name lowercaseString];
NSPredicate *predicate = [NSPredicate predicateWithFormat: #"(name = %#)", lower];
[fetchRequest setPredicate:predicate];
NSError *errorTotal = nil;
NSArray *results = [self.managedObjectContext executeFetchRequest:fetchRequest error:&errorTotal];
if (errorTotal) {
NSLog(#"fetch board error. error:%#", errorTotal);
}
return [results count];
[fetchRequest release];
[results release];
}

Answer 1

You need to modify your designated "UITableViewDataSource" object to return "2" for the "numberOfSectionsInTableView:" method.
Then you need to return the right thing in your "tableView:cellForRowAtIndexPath:" method, depending on the section designated in the index path.
If you want an optional section title (e.g. "History" or "Latest"), you can also return an array of section titles via sectionIndexTitlesForTableView:.

Answer 2

Implement - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 2;
}
This way the tableviewController know's how many sections to create. If you don't implement this method it will create the default number of sections which is 1.
This method is asked to the data source to return the number of sections in the table view.
The default value is 1.
The full method description can be found here
Update:
When the tableview is asking you which cell to display for a certain index path you can give the cell with the right data. Presuming you have 2 NSArray's containing the titles for the latest and history rows you could do the following:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
//create cell
static NSString *CellIdentifier = #"MyCellIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(indexPath.section == 0){
//set title for latest
NSString *title = [[self latestTitles] objectAtIndex:indexPath.row];
[[cell textLabel] setText:title];
}else{
//set title for history
NSString *title = [[self historyTitles] objectAtIndex:indexPath.row];
[[cell textLabel] setText:title];
}
//Update: add NSLog here to check if the cell is not nil..
NSLog(#"cell = %#", cell);
return cell;
}