ios TableView在通过展开段填充时再次重新加载相同的内容

5hcedyr0 于 2023-05-30 发布在 iOS

关注(0)|答案(2)|浏览(131)

1.我有两个结构体用于传递给tableView的数据：

struct Session {
     let dateModel: Date?
     let timeBegModel: Date?
     let timeEndModel: Date?
     let sessionModel: String?
     let venueModel: String?
     var formattedTimeBeg: String {
         guard let text = timeBegModel else {
             return ""
         }
         return DateFormatter.adjustedTimeFormat.string(from: text)
     }
     var formattedTimeEnd: String {
         guard let text = timeEndModel else {
             return ""
         }
         return DateFormatter.adjustedTimeFormat.string(from: text)
     }
 }

1.数据从另一个viewController通过展开segue传递：

@IBAction func unwindToMainVC(segue: UIStoryboardSegue) {
     guard let vc = segue.source as? AddSessionVC else { return }
     guard let date = vc.dateDP?.date, let timeBeg = vc.timeBegDP?.date, let timeEnd = vc.timeEndDP?.date, let session = vc.sessionTF.text, let venue = vc.venueTF.text else { return }
 let Session = Session(dateModel: date, timeBegModel: timeBeg, timeEndModel: timeEnd, sessionModel: session, venueModel: venue)
 sessions.append(Session)
 sessions.sort { $0.timeBegModel! < $1.timeEndModel! }
 sortByDate() // I tried to put this func in the viewDidLoad(), but it doesn't work
 tableView.reloadData()
 }

1.我有一个函数来设置日期作为tableView节的标题：

func sortByDate() {
     let datesInSessions = sessions.reduce(into: Set<Date>()) { result, sessions in
         let dateInSession = Calendar.current.startOfDay(for: sessions.dateModel!)
         result.insert(dateInSession)
     }
     for dateInSession in datesInSessions {
         let dateComp = Calendar.current.dateComponents([.year, .month, .day], from: dateInSession)
         var sortedContent: [Session] = []
         sessions.forEach { sessions in
             let contComp = Calendar.current.dateComponents([.year, .month, .day], from: sessions.dateModel!)
             if contComp == dateComp {
                 sortedContent.append(sessions)
             }
         }
         let newSection = Section(sectionDate: dateInSession, sessions: sortedContent)
         sections.append(newSection)
     }
 }

**问题是，每当我添加一个新单元格（与前一个单元格具有相同的日期）时，具有完全相同日期的部分就会重新创建（见图片）。

我该怎么解决？

ios

来源：https://stackoverflow.com/questions/76320149/tableview-reloads-the-same-content-over-again-when-populated-through-the-unwind

2条答案

按热度按时间

oxcyiej71#

在此代码中：

func sortByDate() {
    let datesInSessions = sessions.reduce(into: Set<Date>()) { result, sessions in
        let dateInSession = Calendar.current.startOfDay(for: sessions.dateModel!)
        result.insert(dateInSession)
    }
    for dateInSession in datesInSessions {
        let dateComp = Calendar.current.dateComponents([.year, .month, .day], from: dateInSession)
        var sortedContent: [Session] = []
        // there you sort sessions
        sessions.forEach { sessions in
            let contComp = Calendar.current.dateComponents([.year, .month, .day], from: sessions.dateModel!)
            if contComp == dateComp {
                sortedContent.append(sessions)
            }
        }
     
        // Here you always create a new Section
        let newSection = Section(sectionDate: dateInSession, sessions: sortedContent)
        sections.append(newSection) <-- the sections array will have one more element
    }
}

由于您没有重置节数组或更新包含会话的节，因此始终在节数组中添加新元素。因此，部分的数量始终为+1，并填充以前的会话+最后一个。这将导致每次添加一个新会话时在表视图中追加一个新节。

赞(0）回复(0）举报 2023-05-30

vuv7lop32#

感谢MobiDev的@OlzhasAkhmetov的外部帮助，我能够修复部分和单元格的重复。
sortByDate（）函数一开始就需要section.removeAll（）。sortByDate（）的最终工作代码如下：

func sortByDate() {
    sections.removeAll() // This is what was missing
    let dates = sessions.reduce(into: Set<Date>()) { result, sessions in
        let date = Calendar.current.startOfDay(for: sessions.dateModel!)
        result.insert(date) }
    for date in dates {
        let dateComp = Calendar.current.dateComponents([.year, .month, .day], from: date)
        var sortedContent: [Session] = []
        sessions.forEach { sessions in
            let contComp = Calendar.current.dateComponents([.year, .month, .day], from: sessions.dateModel!)
            if contComp == dateComp {
                sortedContent.append(sessions) } }
        let newSection = Section(sectionDate: date, sessions: sortedContent)
        sections.append(newSection) } }

赞(0）回复(0）举报 2023-05-30

我来回答

ios TableView在通过展开段填充时再次重新加载相同的内容

2条答案

相关问题

热门标签

最新问答