我有一个UITableViewController，其中显示了按日期排序的交易列表。这是用于个人理财/银行风格的应用程序。
我要实现的目标：点击时，标题部分（显示日期）应该展开/折叠。
我正在使用Realm数据库存储交易数据。
我是一名初学者程序员，我曾尝试通过Google搜索解决方案，但仍坚持尝试创建数据结构来跟踪某个节是打开还是关闭。
我已尝试遵循此（https://www.youtube.com/watch?v=Q8k9E1gQ_qg&），但在12:00被卡住。
领域模型：
class Transaction: Object {
@objc dynamic var amount: Float = 0
@objc dynamic var toFrom: String = ""
@objc dynamic var category : String = ""
@objc dynamic var date: Date? = nil
@objc dynamic var note: String = ""
}
表视图控制器：
class TransactionsViewController : UITableViewController {
@IBOutlet var transactions2TableView: UITableView!
let realm = try! Realm()
var groupedTransactions = [Date:Results<Transaction>]()
var transactionDates = [Date]()
override func viewDidLoad() {
super.viewDidLoad()
loadTransactions()
}
override func numberOfSections(in tableView: UITableView) -> Int {
return transactionDates.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return groupedTransactions[transactionDates[section]]!.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell2", for: indexPath)
let itemsForDate = groupedTransactions[transactionDates[indexPath.section]]!
cell.textLabel?.text = "\(Array(itemsForDate)[indexPath.row].toFrom)"
cell.detailTextLabel?.text = "\(String(describing: convertToCurrency(Array(itemsForDate)[indexPath.row].amount)!))"
return cell
}
func loadTransactions() {
let transaction = realm.objects(Transaction.self).sorted(byKeyPath: "date", ascending: false)
//Find each unique day for which a Transaction exists in your Realm
transactionDates = transaction.reduce(into: [Date](), { results, currentTransaction in
let date = currentTransaction.date!
let beginningOfDay = Calendar.current.date(from: DateComponents(year: Calendar.current.component(.year, from: date), month: Calendar.current.component(.month, from: date), day: Calendar.current.component(.day, from: date), hour: 0, minute: 0, second: 0))!
let endOfDay = Calendar.current.date(from: DateComponents(year: Calendar.current.component(.year, from: date), month: Calendar.current.component(.month, from: date), day: Calendar.current.component(.day, from: date), hour: 23, minute: 59, second: 59))!
//Only add the date if it doesn't exist in the array yet
if !results.contains(where: { addedDate->Bool in
return addedDate >= beginningOfDay && addedDate <= endOfDay
}) {
results.append(beginningOfDay)
}
})
//Filter each transaction in realm based on their date property and assign the results to the dictionary
groupedTransactions = transactionDates.reduce(into: [Date:Results<Transaction>](), { results, date in
let beginningOfDay = Calendar.current.date(from: DateComponents(year: Calendar.current.component(.year, from: date), month: Calendar.current.component(.month, from: date), day: Calendar.current.component(.day, from: date), hour: 0, minute: 0, second: 0))!
let endOfDay = Calendar.current.date(from: DateComponents(year: Calendar.current.component(.year, from: date), month: Calendar.current.component(.month, from: date), day: Calendar.current.component(.day, from: date), hour: 23, minute: 59, second: 59))!
results[beginningOfDay] = realm.objects(Transaction.self).filter("date >= %@ AND date <= %@", beginningOfDay, endOfDay)
})
self.transactionsTableView.reloadData()
}