【发布时间】：2022-01-26 10:28:42
【问题描述】：
我有一个带有不同子类别（“Algrebra”、“Biology”、“Chemistry”）的 tableView，它们通过 searchController 被索引和搜索。我想将这些子类别放在多个类别中（“紧急”、“重要”、“不重要”）并在点击时展开/折叠它们。我还希望将类别编入索引（而不是子类别），但通过 searchController 保持子类别可搜索。
我不知道如何用我的代码正确实现它。
这是我的代码：
类别控制器
class CategoryController: UIViewController, UITableViewDataSource, UITableViewDelegate, UISearchBarDelegate, UISearchResultsUpdating {
private var searchController = UISearchController()
let categories = ["Urgent", "Important", "Not Important"]
let subcategories = [
Add(category: "Algrebra", categoryImg: #imageLiteral(resourceName: "Algebra.png")),
Add(category: "Biology", categoryImg: #imageLiteral(resourceName: "Biology.png")),
Add(category: "Chemistry", categoryImg: #imageLiteral(resourceName: "Chemistry.png")),
]
private var sectionTitles = [String]()
private var filteredSectionTitles = [String]()
private var sortedCategory = [(key: String, value: [Add])]()
private var filteredCategory = [(key: String, value: [Add])]()
private let tableView: UITableView = {
let table = UITableView()
table.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
return table }()
override func viewDidLoad() {
super.viewDidLoad()
//TABLEVIEW
tableView.rowHeight = 50
tableView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(tableView)
tableView.register(CategoryCell.self, forCellReuseIdentifier: "cell")
tableView.dataSource = self
tableView.delegate = self
tableView.sectionIndexColor = .black
tableView.sectionIndexBackgroundColor = .lightGray
tableView.sectionIndexTrackingBackgroundColor = .gray
tableView.allowsMultipleSelection = false
//SEARCHCONTROLLER
self.searchController = UISearchController(searchResultsController: nil)
self.searchController.searchResultsUpdater = self
self.searchController.obscuresBackgroundDuringPresentation = false
self.searchController.searchBar.placeholder = "Search for your category"
self.searchController.hidesNavigationBarDuringPresentation = false
self.navigationItem.searchController = self.searchController
self.navigationItem.hidesSearchBarWhenScrolling = false
self.navigationItem.title = "Tasks"
navigationController?.navigationBar.prefersLargeTitles = true
self.searchController.searchBar.searchTextField.textColor = .label
let groupedList = Dictionary(grouping: self.subcategories, by: { String($0.category.prefix(1)) })
self.sortedCategory = groupedList.sorted{$0.key < $1.key}
for tuple in self.sortedCategory {
self.sectionTitles.append(tuple.key)
}
}
//VIEWDIDLAYOUT
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
tableView.frame = view.bounds
}
/// TABLEVIEW
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if self.searchController.isActive && !self.filteredSectionTitles.isEmpty {
return self.filteredSectionTitles[section]
} else {
return self.sectionTitles[section]
}
}
func sectionIndexTitles(for tableView: UITableView) -> [String]? {
if self.searchController.isActive && !self.filteredSectionTitles.isEmpty {
return self.filteredSectionTitles
} else {
return self.sectionTitles
}
}
func numberOfSections(in tableView: UITableView) -> Int {
if self.searchController.isActive && !self.filteredSectionTitles.isEmpty {
return self.filteredSectionTitles.count
} else {
return self.sectionTitles.count
}
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if self.searchController.isActive && !self.filteredCategory.isEmpty {
return self.filteredCategory[section].value.count
} else {
return self.sortedCategory[section].value.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for:indexPath) as UITableViewCell
cell.imageView?.contentMode = .scaleAspectFit
if self.searchController.isActive && !self.filteredCategory.isEmpty {
cell.textLabel?.text = self.filteredCategory[indexPath.section].value[indexPath.row].category
cell.imageView?.image = self.filteredCategory[indexPath.section].value[indexPath.row].categoryImg
} else {
cell.textLabel?.text = self.sortedCategory[indexPath.section].value[indexPath.row].category
cell.imageView?.image = self.sortedCategory[indexPath.section].value[indexPath.row].categoryImg
}
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let currentCell = tableView.cellForRow(at: indexPath)! as UITableViewCell
Add.details.category = (currentCell.textLabel?.text)!
let secondVC = DateController()
navigationController?.pushViewController(secondVC, animated: true)
print(Add.details.category)
}
func updateSearchResults(for searchController: UISearchController) {
guard let text = self.searchController.searchBar.text else {
return
}
let filteredCategory = self.sortedCategory.flatMap { $0.value.filter { $0.category.contains(text) } }
let groupedCategory = Dictionary(grouping: filteredCategory, by: { String($0.category.prefix(1)) } )
self.filteredCategory = []
self.filteredCategory = groupedCategory.sorted{ $0.key < $1.key }
self.filteredSectionTitles = []
for tuple in self.filteredCategory {
self.filteredSectionTitles.append(tuple.key)
}
self.tableView.reloadData()
}
}
CategoryCell
class CategoryCell: UITableViewCell {
var cellImageView = UIImageView()
var cellLabel = UILabel()
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: "cell")
cellImageView.translatesAutoresizingMaskIntoConstraints = false
cellImageView.contentMode = .scaleAspectFit
cellImageView.tintColor = .systemPink
contentView.addSubview(cellImageView)
cellLabel.translatesAutoresizingMaskIntoConstraints = false
cellLabel.font = UIFont.systemFont(ofSize: 20)
contentView.addSubview(cellLabel)
NSLayoutConstraint.activate([
cellImageView.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
cellImageView.topAnchor.constraint(equalTo: contentView.topAnchor, constant: 8),
cellImageView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor, constant: 20),
cellImageView.widthAnchor.constraint(equalToConstant: 44),
cellLabel.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
cellLabel.leadingAnchor.constraint(equalTo: cellImageView.trailingAnchor, constant: 10),
])
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
添加（数据结构）
struct Add {
static var details: Add = Add()
var category: String = ""
func getDict() -> [String: Any] {
let dict = ["category": self.category,
] as [String : Any]
return dict
}
}
【问题讨论】：
-
暂时忘掉你的代码，试着更好地描述你的目标——因为它不是很清楚。 “化学”是否有“分析/生物/无机/有机/物理”等子项，您想要展开/折叠“化学”并使其子项可搜索？或者，您希望搜索和显示的“Algrebra”、“Biology”、“Chemistry”items 是否在可展开的“Urgent”、“Important”、“Not Important”部分中排序？
-
抱歉解释混乱。所以不，化学没有任何子项目，是的，这正是我想要的，我想让代数/生物学/化学可搜索并在紧急/重要/不重要部分中。 （并使 Urgent/Important/NotImportant 可索引，而不是 Algebra/Biology/Chemistry）
标签： ios swift indexing tableview expand