Programatically implement a searchbar that doesn't scroll - ios

Question

I'm working on implementing a basic searchbar progmatically. I can't figure out how to make the searchbar stick to the header as the table scrolls. here is my code for loading the searchbar :
-(void)loadbar{
searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
searchDisplayController = [[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self];
searchDisplayController.delegate = self;
searchDisplayController.searchResultsDataSource = self;
self.tableView.tableHeaderView = searchBar;
}
Search bar inherits from UISearchBar and searchDisplayController inherits from UISearchDisplayController
Thanks!

Answer 1

A table's header view scrolls with the table. If you don't want the search bar to scroll with the table view, you can't set the search bar as the header view.
You have three options.
Add the search bar to the navigation bar
Make the search bar a subview of the tableview. Implement the scrollViewDidScroll: delegate method for the table view and adjust the position of the scroll bar as the table scrolls.
Don't use UITableViewController. Use UIViewController and add your own table view. Add the search bar at the top and the table view below the search bar.

Answer 2

Solution
Use a one-section table view and set the search bar as the section header.
Discussion
Before, iOS was able to recognize when a search bar was in the table view header. In that case, the search bar was hidden under the navigation bar and it was possible to scroll down to reveal it. When in use, the search bar was fixed at the top of the window, not scrolling with the table view content. Since recently, this behavior is broken: the search bar scrolls with the cells.
In the proposed solution, we set the search bar as a section header. A section header remains visible until we scroll passed the end of that section. Thus, if we only have one section, the search bar is always visible.
Objective-C
// Class members
UISearchBar *searchBar;
- (void)viewDidLoad {
// Inherited
[super viewDidLoad];
// Search Bar
searchBar = [[UISearchBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
searchBar.delegate = self;
searchBar.barStyle = UISearchBarStyleMinimal;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// It is mandatory to have one section, otherwise the search bar will scroll
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// TODO: Return the number of elements in the table
return 1;
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
return searchBar.frame.size.height;
}
-(UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
return searchBar;
}