Question

我有两个实体：

AgendaEvents

AgendaDates

AgendaDates与AgendaEvents有很多关系。

我试图在临时数组（var myTempEvents = [AgendaEvent]（））中存储所有在AgendaDates内部的日期（至少）等于定义日期（myDate）的议程事件

myDate是从日历中选择的日期（JTAppleCalendar）。

for date in calendar.selectedDates {
  myDate = date
}

现在我需要获得在AgendaDates中至少有一个日期等于myDate的所有AgendaEvent对象。我需要时间不要影响比较。

我有一个用于此的功能：

    func agendaEventsWithDate(date: Date) -> NSFetchRequest<AgendaEvent>
{
    // create a fetch request that will retrieve all the AgendaEvents.
    let fetchRequest = NSFetchRequest<AgendaEvent>(entityName: "AgendaEvent")

    // set the predicate to only keep AgendaEvents where the related AgendaDate's date matches the passed in date.
     let cal = Calendar.current
     let startOfDay = cal.startOfDay(for: date)print(selectedDate)
     let endOfDay = cal.date(byAdding: .day, value: 1, to: startOfDay)!

     fetchRequest.predicate = NSPredicate(format: "SUBQUERY(agendaDates, $a, $a.agendaDates >= %@ AND $a.agendaDates < %@).@count > 0", startOfDay as NSDate, endOfDay as NSDate)
   return fetchRequest
}

在我的核心数据中，AgendaEvents和AgendaDate之间的关系是agendaDates和AgendaDates有一个对象日期（类型为Date）。

现在我可以执行提取，我将在此功能中执行此操作：

 func configuringCell(cell: CalendarAgendaCell, indexPath: IndexPath) {
  myTempEvents = try! context.fetch(agendaEventsWithDate(date: selectedDate))
  let myEvent = myTempEvent[indexPath.row]
}

此处myTemEvents数组应填充所有在AgendaDates中至少在日期等于myDate的事件。

我现在的问题是： 1）myDate和谓词中的日期有时间组件。 myDate中的时间取决于用户何时选择日期。 AgendaDate中的一个存储在核心数据中。这意味着通常情况永远不会相同，因此myTempEvents将始终为空。+

2）因为第一个问题我无法进行比较。我不知道获取请求是否有效。

谢谢！

更新-------工作副本

 func agendaEventsWithDate(date: Date) -> NSFetchRequest<AgendaEvent>
{
    // create a fetch request that will retrieve all the AgendaEvents.
    let fetchRequest = NSFetchRequest<AgendaEvent>(entityName: "AgendaEvent")

    // set the predicate to only keep AgendaEvents where the related AgendaDate's date matches the passed in date.
    let cal = Calendar.current
    let startOfDay = cal.startOfDay(for: date)
    print(selectedDate)
    let endOfDay = cal.date(byAdding: .day, value: 1, to: startOfDay)!

    fetchRequest.predicate = NSPredicate(format: "SUBQUERY(agendaDates, $a, $a.agendaDates >= %@ AND $a.agendaDates < %@).@count > 0", startOfDay as NSDate, endOfDay as NSDate)

    return fetchRequest
}

func configuringCell(cell: CalendarAgendaCell, indexPath: IndexPath) {
  let myEvent = myTempEvents[indexPath.row]
  cell.configureCell(agendaEvent: myEvent)
}

 func calendar(_ calendar: JTAppleCalendarView, didSelectDate date: Date, cell: JTAppleCell?, cellState: CellState) {
    selectedDate = date
    calendar.reloadData()
    myTempEvents = try! context.fetch(agendaEventsWithDate(date: selectedDate))
    tableView.reloadData()
}

将coredata对象的日期与给定日期

0 个答案: