Put UISearchBar in Navigation Controller

gistfile1.m

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.title = @"Literature";
    if (searchText.length > 0) {
        [searchBar setShowsCancelButton:YES];
        searchBar.text = searchText;
        [self searchLiteraturesWithName:searchText];
    }
    [self.navigationController.navigationBar setTintColor:[UIColor primaryBarColor]];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]
                                             initWithTitle:@"Categories"
                                             style:UIBarButtonItemStylePlain
                                             target:self
                                             action:@selector(showList:)];
   
 //Mark: Original Snippet commented
    
    /* searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, 0.0, 200.0, 0.0)];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:searchBar];
    searchBar.placeholder = @"Search Files";
    searchBar.delegate = self;
   recentSearchesController = [[SearchViewController alloc]
                                initWithStyle:UITableViewStylePlain];*/
    
    
    searchBar.delegate = self;
    searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0.0, 0.0, 200.0, 44.0)];
    searchBar.placeholder = @"Search Files";
    searchBar.userInteractionEnabled=YES;
    //searchBar.tintColor=[UIColor clearColor];
  
    UIView *searchBarContainer = [[UIView alloc] initWithFrame:searchBar.frame];
    [searchBarContainer addSubview:searchBar];
   
    UIBarButtonItem *searchBarItem = [[UIBarButtonItem alloc] initWithCustomView:searchBarContainer];
    
     NSMutableArray *items= [[NSMutableArray alloc]initWithCapacity:2]; 
     UIBarButtonItem *filter= [[UIBarButtonItem alloc]initWithTitle:@"+" style:UIBarButtonItemStylePlain target:self action:@selector(filterClick:)]; 
    
    [items addObject:filter];
    [items addObject:searchBarItem];
    self.navigationItem.rightBarButtonItems=items;
    recentSearchesController = [[SearchViewController alloc]
                                initWithStyle:UITableViewStylePlain];
    
    
//Mark : : Add finish
    
       
//    Literature* root = [[[LiteratureFetcher alloc] init] rootLiterature];
//    [self printFolders:root];
}