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Adding a Search Bar to a UITableView

/ Published in: Objective C
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This might look complicated but actually it was easy than what I though to integrate. I'm using it with Core Data, but I'm sure you can use it with any data type.

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  1. //Add the search bar delegate to the header file
  2. <UISearchBarDelegate>
  3.  
  4.         //Declare this in the header file.
  5. 	UISearchBar *searchBar;
  6. 	UISearchDisplayController *searchDC;
  7.  
  8.  
  9.  
  10.  
  11. 	// Create a search bar - you can add this in the viewDidLoad
  12. 	self.searchBar = [[[UISearchBar alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 320.0f, 44.0f)] autorelease];
  13. 	self.searchBar.autocorrectionType = UITextAutocorrectionTypeNo;
  14. 	self.searchBar.autocapitalizationType = UITextAutocapitalizationTypeNone;
  15. 	self.searchBar.keyboardType = UIKeyboardTypeAlphabet;
  16. 	self.searchBar.delegate = self;
  17. 	self.tableView.tableHeaderView = self.searchBar;
  18.  
  19. 	// Create the search display controller
  20. 	self.searchDC = [[[UISearchDisplayController alloc] initWithSearchBar:self.searchBar contentsController:self] autorelease];
  21. 	self.searchDC.searchResultsDataSource = self;
  22. 	self.searchDC.searchResultsDelegate = self;
  23.  
  24.  
  25.  
  26. //Then add this to your fetch or query method
  27. #pragma mark -
  28. #pragma mark Fetch Objects
  29.  
  30. - (void) fetchObjects
  31. {
  32. 	// Create a basic fetch request
  33. 	NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
  34. 	[fetchRequest setEntity:[NSEntityDescription entityForName:@"Venue" inManagedObjectContext:MANAGED_OBJECT_CONTEXT]];
  35.  
  36. 	// Add a sort descriptor
  37. 	NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES selector:nil];
  38. 	NSArray *descriptors = [NSArray arrayWithObject:sortDescriptor];
  39. 	[fetchRequest setSortDescriptors:descriptors];
  40. 	[sortDescriptor release];
  41.  
  42. 	// Recover query
  43. 	NSString *query = self.searchBar.text;
  44. 	if (query && query.length) fetchRequest.predicate = [NSPredicate predicateWithFormat:@"name contains[cd] %@", query];
  45.  
  46. 	// Init the fetched results controller
  47. 	NSError *error;
  48. 	self.results = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:MANAGED_OBJECT_CONTEXT sectionNameKeyPath:@"section" cacheName:@"Root"];
  49. 	self.results.delegate = self;
  50. 	if (![[self results] performFetch:&error])	NSLog(@"Error: %@", [error localizedDescription]);
  51.  
  52. 	[self.results release];
  53. 	[fetchRequest release];
  54.  
  55. 	//[self.tableView reloadData];
  56. }

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