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我想基于searchBar文本输入过滤collectionView。我能够通过textDidChange和updateSearchResults函数调用，将数据库中的所有用户加载并填充UISearchResultsUpdating类的collectionView，但collectionView不会基于searchBar输入进行过滤（它始终显示数据库中的所有用户 - 即使在文本输入中也是如此） 。我相信棘手的部分是我有一个collectionView（menuBar类），委托给其他2个collectionViews。这些collectionView中的每一个都有一个不同的searchBar和searchController。请参阅附上的截图和代码以供参考。提前致谢！UISearchResultsUpdating不过滤基于searchBar文本的collectionViewBar
// searchVC既searchControllers
class SearchVC: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UISearchControllerDelegate, UISearchBarDelegate {
var users = [CurrentTraveler]()
var isSearching = false
var filteredData = [CurrentTraveler]()
var peopleResultsViewController: SearchPeopleResultsVC?
var filtered:[String] = []
var searchActive : Bool = false
var searchPeopleController: UISearchController?
let cellId1 = "cellId1"
let cellId2 = "cellId2"
override func viewDidLoad() {
super.viewDidLoad()
setupSearchBar()
setupCollectionView()
}
func setupSearchBar() {
// sets up searchBar for first collectionView...
}
func setupCollectionView() {
contentCollectionView.dataSource = self
contentCollectionView.delegate = self
contentCollectionView.register(SearchPeopleCollectionView.self, forCellWithReuseIdentifier: cellId2)
}
func scrollToMenuIndex(menuIndex: Int) {
let indexPath = IndexPath(item: menuIndex, section: 0)
contentCollectionView.scrollToItem(at: indexPath, at: UICollectionViewScrollPosition(), animated: true)
if indexPath.item == 1 {
searchPeopleController?.delegate = self
searchPeopleController?.searchBar.delegate = self
peopleResultsViewController = SearchPeopleResultsVC()
searchPeopleController = UISearchController(searchResultsController: peopleResultsViewController)
searchPeopleController?.searchResultsUpdater = peopleResultsViewController
navigationItem.titleView = searchPeopleController?.searchBar
}
if indexPath.item == 0 {
// sets up searchController for first collectionView search
}
}
//menubar collectionView
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId1", for: indexPath)
if indexPath.item == 0 {
// set up first collectionView in menubar...
}
if indexPath.item == 1 {
let usersCell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId2", for: indexPath) as! SearchPeopleCollectionView
usersCell.searchVC = self
return usersCell
}
return cell
}
var filterString = "" {
didSet {
guard filterString != oldValue else { return }
if filterString.isEmpty {
filteredData = users
}
else {
filteredData = users.filter { ($0.name?.localizedStandardContains(filterString))! }
}
peopleResultsViewController?.collectionView.reloadData()
}
}
func updateSearchResults(for searchPeopleController: UISearchController) {
filterString = searchPeopleController.searchBar.text ?? ""
if filterString.isEmpty {
filteredData = users
}
else {
filteredData = users.filter { ($0.name?.localizedStandardContains(filterString))! }
}
peopleResultsViewController?.collectionView.reloadData()
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
// should I do anything here...?
}
}
// UISearchResultsUpdating类
class SearchPeopleResultsVC : UIViewController, UISearchResultsUpdating, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout, UISearchBarDelegate {
let cellId = "cellId"
var users = [CurrentTraveler]()
var filteredData = [CurrentTraveler]()
var isSearching = false
var searchVC: SearchVC?
var peopleResultsViewController: SearchPeopleResultsVC?
var searchController: UISearchController?
var searchPeopleCollectionView: SearchPeopleCollectionView?
var filtered:[String] = []
var searchActive : Bool = false
let searchPeopleController = UISearchController(searchResultsController: nil)
lazy var collectionView: UICollectionView = {
cv.dataSource = self
cv.delegate = self
return cv
}()
override func viewDidLoad() {
collectionView.delegate = self
collectionView.dataSource = self
fetchTravelingUserCell()
}
func fetchTravelingUserCell() {
Database.database().reference().child("users").observe(.childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
let user = CurrentTraveler(dictionary: dictionary)
self.users.append(user)
DispatchQueue.main.async(execute: {
self.collectionView.reloadData()
})
}
}, withCancel: nil)
}
var filterString = "" {
didSet {
// Return if the filter string hasn't changed.
guard filterString != oldValue else { return }
if filterString.isEmpty {
filteredData = users
}
else {
filteredData = users.filter { ($0.name?.localizedStandardContains(filterString))! }
}
collectionView.reloadData()
}
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if searchPeopleController.isActive && searchPeopleController.searchBar.text != "" {
return filteredData.count
}
return users.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellId", for: indexPath) as? BaseGlobalSearchUser else { fatalError("Expected to display a `DataItemCollectionViewCell`.") }
if searchPeopleController.isActive && searchPeopleController.searchBar.text != "" {
cell.currentTraveler = filteredData[indexPath.item]
} else {
cell.currentTraveler = users[indexPath.item]
}
return cell
}
func updateSearchResults(for searchPeopleController: UISearchController) {
filterString = searchPeopleController.searchBar.text ?? ""
// does print what user types in the searchBar
print(filterString)
if filterString.isEmpty {
filteredData = users
}
else {
filteredData = users.filter { ($0.name?.localizedStandardContains(filterString))! }
}
peopleResultsViewController?.collectionView.reloadData()
}
func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
if filterString.isEmpty {
filteredData = users
}
else {
filteredData = users.filter { ($0.name?.localizedStandardContains(filterString))! }
}
self.collectionView.reloadData()
}
}
//数据模型类
class CurrentTraveler: SafeJsonObject {
var name: String?
var profileImageUrl: String?
var travelingPlace: String?
init(dictionary: [String: AnyObject]) {
super.init()
self.name = dictionary["name"] as? String
self.profileImageUrl = dictionary["profileImageUrl"] as? String
self.travelingPlace = dictionary["users/uid/Places"] as? String
setValuesForKeys(dictionary)
}
}