导航栏上的SearchController在iOS11上不可见

Question

Until iOS 11 was released, I had a search bar added to a UITableViewController. It is hidden under a navigation bar and is visible when user scrolls the table up. On iOS11, adjusting contentOffset or tableview.bound won't hide the search bar properly, sometimes it does work and sometimes it hides the first row, too. So, I've decided to move the search bar to the navigation bar. But, for some reason, I don't see it anywhere. Here's my code at viewDidLoad

YearTableViewController.m

- (void)viewDidLoad
{

[super viewDidLoad];


if (@available(iOS 11.0, *)) {

//iOS11 -> on navigation bar
self.searchController = [[UISearchController alloc] initWithSearchResultsController:nil];
self.searchController.searchResultsUpdater = self;
self.searchController.delegate = self;
self.searchController.searchBar.delegate = self;
self.searchController.searchBar.barStyle = UISearchBarStyleDefault;
self.searchController.searchBar.showsCancelButton = NO;
[self.searchController.searchBar sizeToFit];
self.searchController.hidesNavigationBarDuringPresentation = NO;
self.searchController.dimsBackgroundDuringPresentation = YES;
[self.navigationItem setSearchController:self.searchController];
[self.navigationController.navigationBar setPrefersLargeTitles:NO];
[self.navigationItem setLargeTitleDisplayMode:UINavigationItemLargeTitleDisplayModeNever];
self.definesPresentationContext = YES;


} else {

//iOS10 or previous -> on table view
UITableViewController *tableViewControllerForSearch = [[UITableViewController alloc]initWithStyle:UITableViewStylePlain];
tableViewControllerForSearch.tableView.dataSource = self;
tableViewControllerForSearch.tableView.delegate = self;
tableViewControllerForSearch.tableView.estimatedRowHeight = 40;
tableViewControllerForSearch.tableView.rowHeight = UITableViewAutomaticDimension;
self.searchController = [[UISearchController alloc] initWithSearchResultsController:tableViewControllerForSearch];
self.searchController.searchResultsUpdater = self;
self.searchController.delegate = self;
self.searchController.searchBar.frame = CGRectMake(self.searchController.searchBar.frame.origin.x, self.searchController.searchBar.frame.origin.y, self.searchController.searchBar.frame.size.width, 44.0);
self.tableView.tableHeaderView = self.searchController.searchBar;
self.definesPresentationContext = YES;
// No border between cells
tableViewControllerForSearch.tableView.separatorStyle = UITableViewCellSelectionStyleNone;

}

EDITED: 2017/10/20 As suggested, I've renamed and simplified the structure.

I have the following structure on storyboard. UINavigationController: Initial view controller YearPageViewController: Inside, it has YearTableViewController

On iOS10, it works fine. On iOS 11, I don't see the searchBar. Thanks for your input.

Answer 1

What about adding

    self.navigationItem.hidesSearchBarWhenScrolling = NO;

Obviously the search bar is hidden by default and only is to be seen when scrolling.

Answer 2

Hope will helpful to you On iOS11

if #available(iOS 11.0, *) {
     self.navigationItem.hidesSearchBarWhenScrolling = NO; 
} 

I known why your view controller is stacks. set ' NO' flag in dimsBackgroundDuringPresentation

self.searchController.dimsBackgroundDuringPresentation = NO;