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IOS TableViews in Navigation Controller

/ Published in: iPhone
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Pulls data from a plist set up as a dictionary of arrays of strings.
Creates multi-level TableView that can be nested inside a navigation controller.
Snippet shows key methods for 2 nested levels.
2 levels --> 2 classes (both of which extend UITableViewController)

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  1. // ---------- Top Level ----------------
  2. - (void)viewDidLoad {
  3.  
  4.     self.title = @"Categories";
  5.     NSMutableArray *array = [[NSMutableArray alloc] init];
  6.  
  7.     NSString *path = [[NSBundle mainBundle] pathForResource:@"CategoryData"
  8.                                                      ofType:@"plist"];
  9.     NSDictionary *dict = [[NSDictionary alloc]
  10.                           initWithContentsOfFile:path];
  11.     self.buildings = dict;
  12.     [dict release];
  13.  
  14.     for(id name in buildings) {
  15.         CategorySecondLevelViewController *controller = [[CategorySecondLevelViewController alloc]
  16.                                                          initWithStyle:UITableViewStylePlain];
  17.         controller.title = name;
  18.  
  19.         [array addObject:controller];
  20.         [controller release];    
  21.     }
  22.  
  23.     self.categories = array;
  24.     [array release];
  25.  
  26.     [super viewDidLoad];
  27. }
  28.  
  29. - (UITableViewCell *)tableView:(UITableView *)tableView 
  30.          cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  31.  
  32.     static NSString *CategoryCell = @"CategoryCell";
  33.  
  34.     // reuse cell if possible
  35.     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:
  36.                              CategoryCell];
  37.     if(cell == nil) {
  38.         cell = [[[UITableViewCell alloc]
  39.                  initWithStyle: UITableViewCellStyleDefault
  40.                  reuseIdentifier: CategoryCell] autorelease];
  41.     }
  42.  
  43.     // configure cell
  44.     NSUInteger row = [indexPath row];
  45.  
  46.     // extension point to include images if wanted
  47.     UITableViewController *controller = [categories objectAtIndex:row];
  48.     cell.textLabel.text = controller.title;
  49.     cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
  50.     return cell;
  51. }
  52.  
  53. // ---------- Second Level ----------------
  54. - (void)viewDidLoad {
  55.  
  56.     NSString *path = [[NSBundle mainBundle] pathForResource:@"CategoryData"
  57.                                                      ofType:@"plist"];
  58.     NSDictionary *dict = [[NSDictionary alloc]
  59.                           initWithContentsOfFile:path];
  60.  
  61.     NSString *key = self.title;
  62.     NSArray *values = [dict objectForKey:key];
  63.  
  64.     self.list = values;
  65.     [dict release];
  66.  
  67.     [super viewDidLoad];
  68. }
  69.  
  70. - (UITableViewCell *)tableView:(UITableView *)tableView
  71.          cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  72.  
  73.     static NSString *BuildingIdentifier = @"BuildingIdentifier";
  74.     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:
  75.                              BuildingIdentifier];
  76.     if(cell == nil) {
  77.         cell = [[[UITableViewCell alloc] 
  78.                  initWithStyle:UITableViewCellStyleDefault
  79.                  reuseIdentifier:BuildingIdentifier] autorelease];
  80.     }
  81.  
  82.     NSUInteger row = [indexPath row];
  83.     cell.textLabel.text = [list objectAtIndex:row];
  84.  
  85.     return cell;
  86. }

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