How to add and remove searchBar from navigationItem - ios

Question

I am having trouble adding and removing a UISearchControllers searchBar to a UINavigationBar.
Here is what I am doing:
Add the searchBar to the view
searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
searchController.searchResultsUpdater = self;
searchController.searchBar.delegate = self;
searchController.dimsBackgroundDuringPresentation = NO;
searchController.hidesNavigationBarDuringPresentation = NO;
searchController.searchBar.searchBarStyle = UISearchBarStyleProminent;
searchController.searchBar.barTintColor = [UIColor blackColor];
searchController.searchBar.tintColor = [UIColor darkGrayColor];
[searchController.searchBar setFrame:CGRectMake(0, 200, 320, searchController.searchBar.frame.size.height)];
[self.view addSubview:searchController.searchBar];
On button click add the searchBar to the navigationItem
This works as expected
[self.navigationController setNavigationBarHidden:false];
self.navigationItem.titleView = searchController.searchBar;
self.navigationItem.hidesBackButton = true;
And here is where I am getting the strange behaviour:
On another button click remove the searchBar from the nav bar and add it back to the view
[searchController.searchBar removeFromSuperview];
[self.navigationController setNavigationBarHidden:YES animated:true];
[self.view addSubview:searchController.searchBar];
[searchController.searchBar setFrame:CGRectMake(0, 200, 320, searchController.searchBar.frame.size.height)];
The searchBar is removed from the Nav Bar as expected, but it is not returned to the main view. ( well i can't see it anywhere)
I log the value of the search bar I can see that it has the frame that I have given it.
Any help here would be greatly appreciated,
Thanks

Answer 1

You should set navigationItem .titleView to nil first and setFrame: in main thread.
- (IBAction)addBar:(id)sender {
self.navigationItem.titleView = nil;
[searchController.searchBar removeFromSuperview];
[self.navigationController setNavigationBarHidden:NO animated:YES];
self.navigationItem.titleView = searchController.searchBar;
self.navigationItem.hidesBackButton = YES;
}
- (IBAction)removeBar:(id)sender {
self.navigationItem.titleView = nil;
[searchController.searchBar removeFromSuperview];
[self.view addSubview:searchController.searchBar];
[self.navigationController setNavigationBarHidden:YES animated:YES];
dispatch_async(dispatch_get_main_queue(), ^{
[self->searchController.searchBar setFrame:CGRectMake(0, 200, 320, self->searchController.searchBar.frame.size.height)];
});
}
By the way, I think it is better that put the search bar in a wrapper UIView when adding to the navigationItem.titleView.