Other ViewController for searchResultsUpdater - ios

Question

How can I set another ViewController for the searchResultsUpdater?
I tried to do it like this, but the results are not updating.
let searchNav = storyboard!.instantiateViewController(withIdentifier: "SearchControllerNav") as! UINavigationController
let vc = searchNav.topViewController as! PageMenuVC
let searchVC = storyboard!.instantiateViewController(withIdentifier: "SearchVC") as! SearchVC
self.searchController = UISearchController(searchResultsController: vc)
vc.searchController.searchResultsUpdater = searchVC
Here's my PageMenuVC:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
var controllerArray : [UIViewController] = []
let searchVC = storyboard?.instantiateViewController(withIdentifier: "SearchVC")
controllerArray.append(searchVC!)
let testVC = storyboard?.instantiateViewController(withIdentifier: "test")
controllerArray.append(testVC!)
// Customize menu (Optional)
let parameters: [CAPSPageMenuOption] = [
.scrollMenuBackgroundColor(UIColor(red: 30.0/255.0, green: 30.0/255.0, blue: 30.0/255.0, alpha: 1.0)),
.viewBackgroundColor(UIColor(red: 20.0/255.0, green: 20.0/255.0, blue: 20.0/255.0, alpha: 1.0)),
.selectionIndicatorColor(UIColor.orange),
.bottomMenuHairlineColor(UIColor(red: 70.0/255.0, green: 70.0/255.0, blue: 80.0/255.0, alpha: 1.0)),
.menuItemFont(UIFont(name: "HelveticaNeue", size: 13.0)!),
.menuHeight(40.0),
.menuItemWidth(90.0),
.centerMenuItems(true)
]
// Initialize scroll menu
pageMenu = CAPSPageMenu(viewControllers: controllerArray, frame: CGRect(x: 0.0, y: 0.0, width: self.view.frame.width, height: self.view.frame.height), pageMenuOptions: nil)
self.addChildViewController(pageMenu!)
self.view.addSubview(pageMenu!.view)
pageMenu!.didMove(toParentViewController: self)
}
In SearchVC I have this function:
//MARK: Filter
func filterContentForSearchText(searchText: String, scope: String = "All") {
filteredUsers = allUsers.filter { user in
return user.name.lowercased().contains(searchText.lowercased())
}
collectionView.reloadData()
}
//MARK: SearchResultDelegate
func updateSearchResults(for searchController: UISearchController) {
let searchBarText = searchController.searchBar.text!
filterContentForSearchText(searchText: searchBarText)
self.searchController = searchController
collectionView.reloadData()
}
If you need more info, let me know!

Answer 1

I think you need to keep the instantiated view controllers in a (private) property of the self view controller: If you set it as the the delegate to vc.searchController.searchResultsUpdater, this is only a weak reference, therefore if you do not store searchVC in self, it will be destroyed too soon (just at the end of the code block). The same holds for searchNav (but I think this will be presented, therefore I'll skip it below):
class MyVC : UIViewController {
var searchVC:UIViewController?
// ...
func XYZ() {
let searchNav = storyboard!.instantiateViewController(withIdentifier: "SearchControllerNav") as! UINavigationController
let vc = searchNav.topViewController as! PageMenuVC
// Store searchVC in property:
self.searchVC = storyboard!.instantiateViewController(withIdentifier: "SearchVC") as! SearchVC
self.searchController = UISearchController(searchResultsController: vc)
vc.searchController.searchResultsUpdater = searchVC
self.present(searchNav, animated:true, completion:nil)
}
}