NFHBeanListViewController Code Description

NFHBeanListViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.beansForIdentifiers = [NSMutableDictionary dictionary];   // initialize data structure
    self.beanManager = [[PTDBeanManager alloc] initWithDelegate:self]; // create an instance of a Bean Manager
    [self performSelector:@selector(scanForBeans) withObject:nil afterDelay:0.5]; //Start scanning for Beans
    
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Login"
                                                                              style:UIBarButtonItemStylePlain
                                                                             target:self
                                                                             action:@selector(showLoginView:)];
}

// some code omitted 

- (void)scanForBeans
{
    // I create a method that implements the SDK's startScanningForBeans_error
    NSError *error = nil;
    [self.beanManager startScanningForBeans_error:&error];
    if (error)
    {
        NSLog(@"Error occurred while scaning for beans: %@", error);
    }
}

- (void)beanManager:(PTDBeanManager*)beanManager didDiscoverBean:(PTDBean*)bean error:(NSError*)error
{   
    // SDK's method that checks to see if there are any nearby Beans
    // for each bean that is discovered, add them to the dictionary
    self.beansForIdentifiers[bean.identifier] = bean;
    [self refreshBeanList];
}

// some code omitted 

- (void)refreshBeanList
{
    // I just sort the Beans by name from the dictionary  and save it to an array 
    NSSortDescriptor *sortByName = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
    self.orderedBeans = [[self.beansForIdentifiers allValues] sortedArrayUsingDescriptors:@[sortByName]];
    [self.tableView reloadData];
}

// some omitted code 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // We write each element in the sorted array to the cell
    static NSString *kCellIdentifier = @"BeanCell";
    PTDBean *beanForRow = [self.orderedBeans objectAtIndex:indexPath.row];
    UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:kCellIdentifier];
    
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"BeanCell"];
    }
    cell.textLabel.text = beanForRow.name;
    cell.detailTextLabel.text = [beanForRow.identifier UUIDString];
    return cell;
}