Using UISearchController to search TableView - ios

Question

I know that Apple deprecated the old Search Display Controller. I have a table with data, and I'm simply making a search bar that will allow the user to search for data (this data only contains alphabetical names) from the table view with a search bar. I was trying to use the following code at one point to detect if the user is typing something:
if(tableView == self.searchDisplayController.searchResultsTableView)
But I cannot because Apple has deprecated the old way. I understand that I have to use the UISearchController now, and I've looked at Apple's documentation and the sample code they provide, but I have not been able to understand it. I've looked everywhere, but have found no solid examples/tutorials on how to do this with objective-c. Can anyone please explain how we use the tableview in conjunction with the UISearchController in order to allow the user to search the data?

Answer 1

I have a simple demo project here
You need a TableviewController to show data,and a TableviewController to show searchResult
For example,(Code from demo project in the link)
Declare a SearchResultViewController
#interface SearchResultViewController : UITableViewController
Then in main tableview
#interface SearchTableViewController()<UISearchBarDelegate,UISearchResultsUpdating>
#property (strong,nonatomic)NSMutableArray * dataArray;
#property (strong,nonatomic)UISearchController * searchcontroller;
#property (strong,nonatomic)SearchResultViewController * resultViewController;
#end
In viewDidLoad,setup everything
self.resultViewController = [[SearchResultViewController alloc] init];
self.searchcontroller = [[UISearchController alloc] initWithSearchResultsController:self.resultViewController];
self.searchcontroller.searchBar.delegate = self;
self.resultViewController.tableView.delegate = self;
[self.searchcontroller.searchBar sizeToFit];
self.searchcontroller.searchResultsUpdater = self;
self.searchcontroller.dimsBackgroundDuringPresentation = NO;
self.definesPresentationContext = YES;
self.tableView.tableHeaderView = self.searchcontroller.searchBar;
Then in delegate method,do real search and update searchResultViewController
#pragma mark - search bar delegate
-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{
[searchBar resignFirstResponder];
}
#pragma mark - UISearchResultUpdating
//Do real search,this is up to you
-(void)updateSearchResultsForSearchController:(UISearchController *)searchController{
NSString * searchtext = searchController.searchBar.text;
NSArray * searchResults = [self.dataArray filteredArrayUsingPredicate:[NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {
BOOL result = NO;
if ([(NSString *)evaluatedObject hasPrefix:searchtext]) {
result = YES;
}
return result;
}]];
SearchResultViewController *tableController = (SearchResultViewController *)self.searchcontroller.searchResultsController;
tableController.dataArray = searchResults;
[tableController.tableView reloadData];
}