【发布时间】：2018-04-22 00:36:33
【问题描述】：
我创建了一个带有搜索栏的集合视图。在此集合视图上可以选择行。当我搜索某些内容和选择一行时，搜索栏工作得很好。但是，当我单击搜索栏的取消按钮时，所选行正在更改。例如，集合视图上有 3 行。所有这些都是可选的。我正在寻找第 3 行并选择它。选择第 3 行后，如果我单击搜索栏的取消按钮，则所选行正在更改，并且第 1 行正在被选中。我该如何处理这个问题？
import UIKit
class CollectionViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UISearchControllerDelegate, UISearchBarDelegate {
@IBOutlet weak var collectionView: UICollectionView!
let searchController = UISearchController(searchResultsController: nil)
var things = [Things]()
var filteredThings = [Things]()
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
CollectionViewController.instance = self
things = [
Things(name: "1", imageName: "firstImage", including: false),
Things(name: "2", imageName: "secondImage", including: false),
Things(name: "3", imageName: "thirdImage", including: false)
]
// Setup the Search Controller
self.searchController.searchResultsUpdater = self
self.searchController.delegate = self
self.searchController.searchBar.delegate = self
self.searchController.hidesNavigationBarDuringPresentation = false
self.searchController.dimsBackgroundDuringPresentation = true
self.searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search for tools and resources"
searchController.searchBar.sizeToFit()
searchController.searchBar.becomeFirstResponder()
self.navigationItem.titleView = searchController.searchBar
definesPresentationContext = true
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if isFiltering() {
return filteredThings.count
}
return things.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "customCell", for: indexPath) as! CustomCollectionViewCell
let thing: Thing
if isFiltering() {
thing = filteredThings[indexPath.row]
} else {
thing = things[indexPath.row]
}
cell.imageView.image = UIImage(named: thing.imageName)
cell.labelView.text = thing.name
cell.layer.cornerRadius = 7
cell.imageView.layer.cornerRadius = 7
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
var thing: Things
if isFiltering() {
thing = filteredThings[indexPath.row]
} else {
thing = things[indexPath.row]
}
cell?.layer.cornerRadius = 5
cell?.layer.borderWidth = 3
cell?.layer.borderColor = myGreenTabBarColor.cgColor
thing.including = true
print(thing.name)
print(thing.including)
collectionView.allowsMultipleSelection = true
print("This cell is selected")
}
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
let cell = collectionView.cellForItem(at: indexPath)
var thing: Things
if isFiltering() {
thing = filteredThings[indexPath.row]
} else {
thing = things[indexPath.row]
}
cell?.layer.cornerRadius = 5
cell?.layer.borderWidth = 3
cell?.layer.borderColor = UIColor.white.cgColor
thing.including = false
print(thing.including)
collectionView.allowsMultipleSelection = true
print("This cell is Deselected")
}
func searchBarIsEmpty() -> Bool {
// Returns true if the text is empty or nil
return searchController.searchBar.text?.isEmpty ?? true
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
self.dismiss(animated: true, completion: nil)
collectionView.reloadData()
}
func filterContentForSearchText(_ searchText: String, scope: String = "All") {
filteredThings = things.filter({( thing : Things) -> Bool in
return thing.name.lowercased().contains(searchText.lowercased())
})
collectionView.reloadData()
}
func isFiltering() -> Bool {
return searchController.isActive && !searchBarIsEmpty()
}
}
extension CollectionViewController: UISearchResultsUpdating {
// MARK: - UISearchResultsUpdating Delegate
func updateSearchResults(for searchController: UISearchController) {
// TODO
filterContentForSearchText(searchController.searchBar.text!)
}
}
【问题讨论】：
标签： swift uicollectionview uicollectionviewcell uisearchbar uisearchcontroller