ios Complex sorting in tableView

enxuqcxy 于 2023-05-30 发布在 iOS

关注(0)|答案(2)|浏览(169)

我有两个数组：

var sections: [SectionContent] = []
var cells: [CellContent] = []

在这两个数组中，一个嵌套在另一个里面：

struct SectionContent {
    let sectionDate: Date
    let sectionContent: [CellContent]
}

struct CellContent {
    let cellDate: Date?
    var formattedDate: String {
        guard let text = cellDate else { return "" }
        return DateFormatter.stringDate.string(from: text)
    }
}

extension DateFormatter {
    static let stringDate: DateFormatter = {
        let formatterDate = DateFormatter()
        formatterDate.dateFormat = "MMM d, h:mm a"
        return formatterDate
    }()
}

'sections'数组将日期显示为tableView中的节标题。
“单元格”数组显示分配给该日期的相应数据。
日期是在一个单独的viewController中设置的，我从该viewController中对第一个viewController执行unwindSegue操作。
我设法通过在unwindSegue中包含以下代码来按日期对各部分进行排序：

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

问：给定我的配置，如何按相应的时间（较早的时间在顶部，较晚的时间在底部）对一个部分中的单元格进行排序？

编辑：这是我如何构建部分：

func sortByDate() {
    sections.removeAll()
    let dates = cells.reduce(into: Set<Date>()) { result, cells in
        let date = Calendar.current.startOfDay(for: cells.cellDate!)
        result.insert(date) }
    for date in dates {
        let dateComp = Calendar.current.dateComponents([.year, .month, .day], from: date)
        var sortedContent: [CellContent] = []
        cells.forEach { cells in
            let contComp = Calendar.current.dateComponents([.year, .month, .day], from: cells.cellDate!)
            if contComp == dateComp {
                sortedContent.append(cells) } }
        let newSection = SectionContent(sectionDate: date, sectionContent: sortedContent)
        sections.append(newSection) } }

ios

来源：https://stackoverflow.com/questions/76356017/complex-sorting-in-tableview

2条答案

按热度按时间

yjghlzjz1#

class ViewController:UIViewController,UITableViewDataSource,UITableViewDelegate {
    
    var sections: [SectionContent] = SectionContent.demo()
    
    // just give unsorted/sorted sections to this function and it will return sorted section  
    func sortedContent(unsorted:[SectionContent]) -> [SectionContent] {
        var sorted = [SectionContent]()
        sorted = unsorted.sorted(by: { $0.sectionDate < $1.sectionDate})
        sorted.enumerated().forEach { index,section in
            sorted[index].sectionContent = section.sectionContent.sorted(by: { $0.cellDate ?? Date() < $1.cellDate ?? Date()})
        }
        return sorted
    }
    
    
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return sortedContent(unsorted: sections).count
    }
    
    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        let _section = sortedContent(unsorted: sections)[section]
        return _section.sectionDate.formatted()
    }
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let section = sortedContent(unsorted: sections)[indexPath.section]
        let row = section.sectionContent[indexPath.row]
    }
    
}

struct SectionContent {
    
    let sectionDate: Date
    var sectionContent: [CellContent]
    
    static func demo() -> [SectionContent] {
        return [SectionContent(sectionDate: Date().addingTimeInterval(-46000),
                               sectionContent: [CellContent(cellDate: Date().addingTimeInterval(4000)),
                                                CellContent(cellDate: Date().addingTimeInterval(3000)),
                                                CellContent(cellDate: Date().addingTimeInterval(1000)),
                                                CellContent(cellDate: Date().addingTimeInterval(60))]),
                SectionContent(sectionDate: Date().addingTimeInterval(-76000),
                                       sectionContent: [CellContent(cellDate: Date())]),
                SectionContent(sectionDate: Date().addingTimeInterval(-6000),
                                       sectionContent: [CellContent(cellDate: Date())]),
                SectionContent(sectionDate: Date().addingTimeInterval(-50),
                                       sectionContent: [CellContent(cellDate: Date())])]
    }
    
    
}

只给予未排序/已排序的部分交给此函数，它将返回已排序的部分

赞(0）回复(0）举报 2023-05-30

icomxhvb2#

按您正在执行的顺序对这些部分进行排序

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

然后按下面的方式排序

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

请注意，必须将sectionContent更改为var，第二次排序才能起作用

struct SectionContent {
    let sectionDate: Date
    var sectionContent: [CellContent] //<--- must be var not let
}

赞(0）回复(0）举报 2023-05-30

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ios Complex sorting in tableView

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