复杂的tableView排序

huangapple
go评论97阅读模式
英文:

Complex sorting in tableView

问题

我有两个数组：

  1. var sections: [SectionContent] = []
  2. var cells: [CellContent] = []

这两个数组中的一个嵌套在另一个数组中：

  1. struct SectionContent {
  2.     let sectionDate: Date
  3.     let sectionContent: [CellContent]
  4. }
  6. struct CellContent {
  7.     let cellDate: Date?
  8.     var formattedDate: String {
  9.         guard let text = cellDate else { return "" }
  10.         return DateFormatter.stringDate.string(from: text)
  11.     }
  12. }
  14. extension DateFormatter {
  15.     static let stringDate: DateFormatter = {
  16.         let formatterDate = DateFormatter()
  17.         formatterDate.dateFormat = "MMM d, h:mm a"
  18.         return formatterDate
  19.     }()
  20. }

'sections' 数组在 tableView 中显示日期作为部分标题。

'cells' 数组显示分配给该日期的相应数据。

日期是在单独的视图控制器中设置的，从该视图控制器执行 unwindSegue 返回到第一个视图控制器。

我成功通过在 unwindSegue 中包含以下代码对部分按日期进行排序：

  1. sections.sort { $0.sectionDate < $1.sectionDate }

问题：在我的配置下，如何按照相应的时间对一个部分内的单元格进行排序（较早的时间在顶部，较晚的时间在底部）？

英文:

I have two arrays:

  1. var sections: [SectionContent] = []
  2. var cells: [CellContent] = []

Of those two arrays, one is nested inside the other one:

  1. struct SectionContent {
  2.     let sectionDate: Date
  3.     let sectionContent: [CellContent]
  4. }
  6. struct CellContent {
  7.     let cellDate: Date?
  8.     var formattedDate: String {
  9.         guard let text = cellDate else { return &quot;&quot; }
  10.         return DateFormatter.stringDate.string(from: text)
  11.     }
  12. }
  14. extension DateFormatter {
  15.     static let stringDate: DateFormatter = {
  16.         let formatterDate = DateFormatter()
  17.         formatterDate.dateFormat = &quot;MMM d, h:mm a&quot;
  18.         return formatterDate
  19.     }()
  20. }

The 'sections' array displays the date as the section header in tableView.

The 'cells' array displays the respective data assigned to that date.

The date is set in a separate viewController from which I do the unwindSegue to the first viewController.

I managed to sort the sections by date thru including this code inside of the unwindSegue:

  1. sections.sort { $0.sectionDate &lt; $1.sectionDate }

Question: Given my configuration, how do I sort cells within one section by the corresponding time (earlier time at the top and later at the bottom)?

复杂的tableView排序

Edit: This is how I construct the Section:

  1. func sortByDate() {
  2.     sections.removeAll()
  3.     let dates = cells.reduce(into: Set&lt;Date&gt;()) { result, cells in
  4.         let date = Calendar.current.startOfDay(for: cells.cellDate!)
  5.         result.insert(date) }
  6.     for date in dates {
  7.         let dateComp = Calendar.current.dateComponents([.year, .month, .day], from: date)
  8.         var sortedContent: [CellContent] = []
  9.         cells.forEach { cells in
  10.             let contComp = Calendar.current.dateComponents([.year, .month, .day], from: cells.cellDate!)
  11.             if contComp == dateComp {
  12.                 sortedContent.append(cells) } }
  13.         let newSection = SectionContent(sectionDate: date, sectionContent: sortedContent)
  14.         sections.append(newSection) } }

答案1

得分: 1

class ViewController:UIViewController,UITableViewDataSource,UITableViewDelegate {

  1. var sections: [SectionContent] = SectionContent.demo()
  3. // just give unsorted/sorted sections to this function and it will return sorted section  
  4. func sortedContent(unsorted:[SectionContent]) -> [SectionContent] {
  5.     var sorted = [SectionContent]()
  6.     sorted = unsorted.sorted(by: { $0.sectionDate < $1.sectionDate})
  7.     sorted.enumerated().forEach { index,section in
  8.         sorted[index].sectionContent = section.sectionContent.sorted(by: { $0.cellDate ?? Date() < $1.cellDate ?? Date()})
  9.     }
  10.     return sorted
  11. }
  15. func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
  16.     return sortedContent(unsorted: sections).count
  17. }
  19. func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
  20.     let _section = sortedContent(unsorted: sections)[section]
  21.     return _section.sectionDate.formatted()
  22. }
  23. func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
  24.     let section = sortedContent(unsorted: sections)[indexPath.section]
  25.     let row = section.sectionContent[indexPath.row]
  26. }

}

struct SectionContent {

  1. let sectionDate: Date
  2. var sectionContent: [CellContent]
  4. static func demo() -> [SectionContent] {
  5.     return [SectionContent(sectionDate: Date().addingTimeInterval(-46000),
  6.                            sectionContent: [CellContent(cellDate: Date().addingTimeInterval(4000)),
  7.                                             CellContent(cellDate: Date().addingTimeInterval(3000)),
  8.                                             CellContent(cellDate: Date().addingTimeInterval(1000)),
  9.                                             CellContent(cellDate: Date().addingTimeInterval(60))]),
  10.             SectionContent(sectionDate: Date().addingTimeInterval(-76000),
  11.                                    sectionContent: [CellContent(cellDate: Date())]),
  12.             SectionContent(sectionDate: Date().addingTimeInterval(-6000),
  13.                                    sectionContent: [CellContent(cellDate: Date())]),
  14.             SectionContent(sectionDate: Date().addingTimeInterval(-50),
  15.                                    sectionContent: [CellContent(cellDate: Date())])]
  16. }

}

Just give unsorted/sorted sections to this function and it will return sorted section

英文: 
  1. class ViewController:UIViewController,UITableViewDataSource,UITableViewDelegate {
  2.     
  3.     var sections: [SectionContent] = SectionContent.demo()
  4.     
  5.     // just give unsorted/sorted sections to this function and it will return sorted section  
  6.     func sortedContent(unsorted:[SectionContent]) -&gt; [SectionContent] {
  7.         var sorted = [SectionContent]()
  8.         sorted = unsorted.sorted(by: { $0.sectionDate &lt; $1.sectionDate})
  9.         sorted.enumerated().forEach { index,section in
  10.             sorted[index].sectionContent = section.sectionContent.sorted(by: { $0.cellDate ?? Date() &lt; $1.cellDate ?? Date()})
  11.         }
  12.         return sorted
  13.     }
  14.     
  15.     
  16.     
  17.     func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -&gt; Int {
  18.         return sortedContent(unsorted: sections).count
  19.     }
  20.     
  21.     func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -&gt; String? {
  22.         let _section = sortedContent(unsorted: sections)[section]
  23.         return _section.sectionDate.formatted()
  24.     }
  25.     func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -&gt; UITableViewCell {
  26.         let section = sortedContent(unsorted: sections)[indexPath.section]
  27.         let row = section.sectionContent[indexPath.row]
  28.     }
  29.     
  30. }
  32. struct SectionContent {
  33.     
  34.     let sectionDate: Date
  35.     var sectionContent: [CellContent]
  36.     
  37.     static func demo() -&gt; [SectionContent] {
  38.         return [SectionContent(sectionDate: Date().addingTimeInterval(-46000),
  39.                                sectionContent: [CellContent(cellDate: Date().addingTimeInterval(4000)),
  40.                                                 CellContent(cellDate: Date().addingTimeInterval(3000)),
  41.                                                 CellContent(cellDate: Date().addingTimeInterval(1000)),
  42.                                                 CellContent(cellDate: Date().addingTimeInterval(60))]),
  43.                 SectionContent(sectionDate: Date().addingTimeInterval(-76000),
  44.                                        sectionContent: [CellContent(cellDate: Date())]),
  45.                 SectionContent(sectionDate: Date().addingTimeInterval(-6000),
  46.                                        sectionContent: [CellContent(cellDate: Date())]),
  47.                 SectionContent(sectionDate: Date().addingTimeInterval(-50),
  48.                                        sectionContent: [CellContent(cellDate: Date())])]
  49.     }
  50.     
  51.     
  52. }

Just give unsorted/sorted sections to this function and it will return sorted section

答案2

得分: 0

sort the sections as you're already doing it

//排序部分
sections.sort { $0.sectionDate < $1.sectionDate }

then sort the contents like this

//排序内容
for index in 0..<sections.count {
sections[index].sectionContent.sort { $0.cellDate ?? .now < $1.cellDate ?? .now }
}

note that you must change sectionContent to a var for the second sort to work

请注意，必须将 sectionContent 更改为变量（var），以使第二个排序有效

结构体 SectionContent {
let sectionDate: Date
var sectionContent: [CellContent] // <--- 必须为 var，而不是 let
}

英文:

sort the sections as you're already doing it

  1. //sort the sections
  2. sections.sort { $0.sectionDate &lt; $1.sectionDate }

then sort the contents like this

  1. //sort the contents
  2. for index in 0..&lt;sections.count {
  3.     sections[index].sectionContent.sort { $0.cellDate ?? .now &lt; $1.cellDate ?? .now }
  4. }

note that you must change sectionContent to a var for the second sort to work

  1. struct SectionContent {
  2.     let sectionDate: Date
  3.     var sectionContent: [CellContent] //&lt;--- must be var not let
  4. }

huangapple
  • 本文由 发表于 2023年5月29日 17:08:48
  • 转载请务必保留本文链接：https://go.coder-hub.com/76356017.html
  • arrays
  • ios
  • sorting
  • swift
  • tableview
匿名

发表评论

匿名网友

:?: :razz: :sad: :evil: :!: :smile: :oops: :grin: :eek: :shock: :???: :cool: :lol: :mad: :twisted: :roll: :wink: :idea: :arrow: :neutral: :cry: :mrgreen:

确定