取消搜索栏时，所选行正在更改

Posted 2023-03-13

【中文标题】取消搜索栏时，所选行正在更改

【英文标题】：When searchbar is cancelled, selected row is changing

【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!)

 

【参考方案1】：

好的，你有 3 行（“a”、“b”、“c”） 然后你搜索“c” 现在表格中有 1 行带有“c” 这一行有 Indexpath(section = 0, row = 0) 现在您使用 Indexpath(section = 0, row = 0) 选择行 取消搜索 - 再次搜索 3 行 并且选中的行是 Indexpath(section = 0, row = 0) 的行。猜猜这是什么单品？ （“一”）

我想你应该存储选定的项目而不是索引路径并在 cellforrow 方法中选择单元格