MainViewController.m

/*
     File: MainViewController.m 
 Abstract: Main table view controller for the application. 
  Version: 1.5 
  
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 */

#import "MainViewController.h"
#import "Product.h"

@interface MainViewController ()
{
    NSOperationQueue *searchQueue;
}

@end
@implementation MainViewController

@synthesize listContent, filteredListContent, savedSearchTerm, savedScopeButtonIndex, searchWasActive;


#pragma mark - 
#pragma mark Lifecycle methods

- (void)viewDidLoad
{
	self.title = @"Products";
	
	// create a filtered list that will contain products for the search results table.
	self.filteredListContent = [NSMutableArray arrayWithCapacity:[self.listContent count]];
	
	// restore search settings if they were saved in didReceiveMemoryWarning.
    if (self.savedSearchTerm)
	{
        [self.searchDisplayController setActive:self.searchWasActive];
        [self.searchDisplayController.searchBar setSelectedScopeButtonIndex:self.savedScopeButtonIndex];
        [self.searchDisplayController.searchBar setText:savedSearchTerm];
        
        self.savedSearchTerm = nil;
    }
	
	[self.tableView reloadData];
	self.tableView.scrollEnabled = YES;
    
    searchQueue = [[NSOperationQueue alloc] init];
    [searchQueue setMaxConcurrentOperationCount:1];
}

- (void)viewDidUnload
{
	self.filteredListContent = nil;
}

- (void)viewDidDisappear:(BOOL)animated
{
    // save the state of the search UI so that it can be restored if the view is re-created
    self.searchWasActive = [self.searchDisplayController isActive];
    self.savedSearchTerm = [self.searchDisplayController.searchBar text];
    self.savedScopeButtonIndex = [self.searchDisplayController.searchBar selectedScopeButtonIndex];
}

- (void)dealloc
{
	[listContent release];
	[filteredListContent release];
	
	[super dealloc];
}


#pragma mark -
#pragma mark UITableView data source and delegate methods

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
	/*
	 If the requesting table view is the search display controller's table view, return the count of
     the filtered list, otherwise return the count of the main list.
	 */
	if (tableView == self.searchDisplayController.searchResultsTableView)
	{
        return [self.filteredListContent count];
    }
	else
	{
        return [self.listContent count];
    }
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
	static NSString *kCellID = @"cellID";
	
	UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:kCellID];
	if (cell == nil)
	{
		cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCellID] autorelease];
		cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
	}
	
	/*
	 If the requesting table view is the search display controller's table view, configure the cell using the filtered content, otherwise use the main list.
	 */
	Product *product = nil;
	if (tableView == self.searchDisplayController.searchResultsTableView)
	{
        product = [self.filteredListContent objectAtIndex:indexPath.row];
    }
	else
	{
        product = [self.listContent objectAtIndex:indexPath.row];
    }
	
	cell.textLabel.text = product.name;
	return cell;
}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIViewController *detailsViewController = [[UIViewController alloc] init];
    
	/*
	 If the requesting table view is the search display controller's table view, configure the next view controller using the filtered content, otherwise use the main list.
	 */
	Product *product = nil;
	if (tableView == self.searchDisplayController.searchResultsTableView)
	{
        product = [self.filteredListContent objectAtIndex:indexPath.row];
    }
	else
	{
        product = [self.listContent objectAtIndex:indexPath.row];
    }
	detailsViewController.title = product.name;
    
    [[self navigationController] pushViewController:detailsViewController animated:YES];
    [detailsViewController release];
}


#pragma mark -
#pragma mark Content Filtering

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
	/*
	 Update the filtered array based on the search text and scope.
	 */
	[searchQueue cancelAllOperations];
    [searchQueue addOperationWithBlock:^{
        NSMutableArray *arr = [NSMutableArray array];
        for (Product *product in listContent)
        {
            if ([scope isEqualToString:@"All"] || [product.type isEqualToString:scope])
            {
                NSComparisonResult result = [product.name compare:searchText options:(NSCaseInsensitiveSearch|NSDiacriticInsensitiveSearch) range:NSMakeRange(0, [searchText length])];
                if (result == NSOrderedSame)
                {
                    [arr addObject:product];
                }
            }
        }
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            [self.filteredListContent removeAllObjects];
            [self.filteredListContent addObjectsFromArray:arr];
            [self.searchDisplayController.searchResultsTableView reloadData];
        }];
    }];
	// First clear the filtered array.
	
	/*
	 Search the main list for products whose type matches the scope (if selected) and whose name matches searchText; add items that match to the filtered array.
	 */
	
}


#pragma mark -
#pragma mark UISearchDisplayController Delegate Methods

- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    if (![searchString isEqualToString:@""]) {
        [self filterContentForSearchText:searchString scope:
         [[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
        return NO;
    }
    
    [self.filteredListContent removeAllObjects];
    // Return YES to cause the search result table view to be reloaded.
    return YES;
}


- (BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption
{
    [self filterContentForSearchText:[self.searchDisplayController.searchBar text] scope:
			[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
    
    // Return YES to cause the search result table view to be reloaded.
    return YES;
}


@end