How to Show and Hide UISearchDisplayController'

I have a button search that located in the right side of the navigation. This is my code:

UIButton *btnSearch = [UIButton buttonWithType:UIButtonTypeCustom];
btnSearch.frame = CGRectMake(0, 0, 22, 22);
[btnSearch setImage:[UIImage imageNamed:@"search_btn.png"] forState:UIControlStateNormal];
[btnSearch addTarget:self action:@selector(showSearch:) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *searchItem = [[UIBarButtonItem alloc] initWithCustomView:_btnSearch];

self.navigationItem.rightBarButtonItems = searchItem ;

This is how it's look.

And I want to display search bar after clicked on the search button, and close it after clicked on cancel and then show the Navigationbar back, but I don't know how to code it.

- (IBAction)showSearch:(id)sender{
    ???
}

This what I want.

Please help or provide some sample code. I really need it.

Thank for reading.

Add a property UISearchBar *mySearchBar to your viewController as

@property(nonatomic, retain) UISearchBar *mySearchBar;

Conform to UISearchBarDelegate as

@interface HomeViewController () <UISearchBarDelegate>
...
...
@end

Then implement the showSearch method as

-(void)showSearch:(id)sender {
if(!mySearchBar) {
    mySearchBar = [[UISearchBar alloc] init];
    [mySearchBar setFrame:CGRectMake(0, 0, self.view.frame.size.width, 55)];
    [mySearchBar setShowsCancelButton:YES animated:YES];
    [self.view addSubview: mySearchBar];
    mySearchBar.delegate = self;
    self.navigationController.navigationBarHidden = YES;
}else {
    searchBar.alpha = 1.0;
    self.navigationController.navigationBarHidden = YES;
}

Then implement the search bar delegate method as :

 - (void)searchBarCancelButtonClicked:(UISearchBar *) searchBar {
        self.navigationController.navigationBarHidden = NO;
        [mySearchBar setAlpha:0.0];
    }

Hope you have got the idea by doing this. Also you can add it directly to navigation controller, itself, if you want & then play with Showing/ hiding the searchBar alone.

You can add it to navigation controller as just initialize the mysearchBar & add it to navigationBar as :

   UIBarButtonItem *searchBarItem = [[UIBarButtonItem alloc] initWithCustomView:mySearchBar];
   self.navigationItem.rightBarButtonItem = searchBarItem;