现在我的 tableView 按日期排序,但我还需要,如果日期相同,则将它们连接成一个部分。请告诉我该怎么做?
class Transaction {
var amount = "0"
var date = Date()
var note = ""
}
所有升级结果都是以前的。
class OperationsViewController: UITableViewController {
var transactions: Results<Transaction>!
var dic = [String : [Transaction]]()
override func viewDidLoad() {
super.viewDidLoad()
transactions = realm.objects(Transaction.self)
// transactions = realm.objects(Transaction.self).sorted(byKeyPath: "date", ascending: false)
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "yyyy-MM-dd"
dic = Dictionary(grouping: transactions, by: {dateFormatter.string(from: $0.date) })
}
override func viewWillAppear(_ animated: Bool) {
super .viewWillAppear(animated)
tableView.reloadData()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return dic.keys.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dic[Array(dic.keys)[section]]?.count ?? 0
}
override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
return ???
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "operationCell", for: indexPath) as! OperationsViewCell
let keys = Array(dic.keys)
let item = dic[keys[indexPath.section]]!
let transaction = item[indexPath.row]
cell.categoryLabel.text = transaction.category.rawValue
cell.amountLabel.text = creatMathSymbols(indexPath) + transaction.amount + " " + "₴"
cell.noteLabel.text = transaction.note
return cell
}
最佳答案
假设你有一个数组
let arr = [Transaction]()
let dic = Dictionary(grouping: arr, by: { $0.date})
dic
将是 [Date:[Transaction]]
考虑 date
键作为部分和值 [Transaction]
作为部分行
numberOfsections
dic.keys.count
和
numberofRows
let keys = Array(dic.keys)
let item = dic[keys[section]]!
return item.count
编辑:
let form = DateFormatter()
form.dateFormat = "yyyy-MM-dd"
let arr = [Transaction]()
let dic = Dictionary(grouping: arr, by: {form.string(from: $0.date)})
关于ios - 如何在一个部分中组合相同的日期对象?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56109447/