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class Event: NsmanagedObject { @Nsmanaged var startDate: NSDate @Nsmanaged var details: EventDetail //i think this property shoud be var details Array<EventDetail> am i correct? } class EventDetail: NsmanagedObject { @Nsmanaged var title: String @Nsmanaged var LOCATIOn: String @Nsmanaged var note: String @Nsmanaged var endDate: NSDate @Nsmanaged var event: NsmanagedObject }
我想将事件放在section中,将eventDetails放在行中.
我创建了加载事件的方法：
var eventList : Array<AnyObject> = [] func loadEvents(){ let appDel : AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate let moc: NsmanagedObjectContext = appDel.managedObjectContext! let eventMO = NSFetchrequest(entityName: "Event") eventMO.returnsObjectsAsFaults = false var err : NSErrorPointer = nil eventList = moc.executeFetchrequest(eventMO,error: err)! self.tblEvento.reloadData() } func numberOfSectionsInTableView(tableView: UITableView!) -> Int { return eventList.count } func tableView(tableView: UITableView,numberOfRowsInSection section: int) -> Int { //return (eventList[section] as Event).details.count return //????? what can i put here }
我不知道我可以在方法numbertOfRowsInSection中添加什么来定义该节具有的行数.因为我无法访问details.count或类似的东西.
我认为还有其他方法可以做到这一点.我看到一些东西使用NSFetchedResultsController但没有成功.
我会帮助你.
@H_502_4@
现在,直接提出您的问题：NSFetchResultsController的示例“实现”：
var fetchedResultsController：NSFetchedResultsController {
if _fetchedResultsController != nil { return _fetchedResultsController! } let fetchrequest = NSFetchrequest() // Edit the entity name as appropriate. let entity = NSEntityDescription.entityForName("Event",inManagedObjectContext: self.managedObjectContext!) fetchrequest.entity = entity // Set the batch size to a suitable number. fetchrequest.fetchBatchSize = 20 // Edit the sort key as appropriate. let sectionSortDescriptor = NSSortDescriptor(key: "startDate",ascending: truE) let secondSortDescriptor = NSSortDescriptor(key: "title",ascending: truE) let sortDescriptors = [sectionSortDescriptor,secondSortDescriptor] fetchrequest.sortDescriptors = sortDescriptors // Edit the section name key path and cache name if appropriate. // nil for section name key path means "no sections". let aFetchedResultsController = NSFetchedResultsController(fetchrequest: fetchrequest,managedObjectContext: self.managedObjectContext!,sectionNameKeyPath: "startDate",cachename: nil) aFetchedResultsController.delegate = self _fetchedResultsController = aFetchedResultsController var error: NSError? = nil if !_fetchedResultsController!.performFetch(&error) { // replace this implementation with code to handle the error appropriately. // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application,although it may be useful during development. //println("Unresolved error \(error),\(error.userInfo)") abort() } return _fetchedResultsController! } // MARK: - Table view data source override func numberOfSectionsInTableView(tableView: UITableView) -> Int { return self.fetchedResultsController.sections?.count ?? 0 } override func tableView(tableView: UITableView,numberOfRowsInSection section: int) -> Int { let sectionInfo = self.fetchedResultsController.sections![section] as NSFetchedResultsSectionInfo return sectionInfo.numberOfObjects }@H_502_4@ @H_502_4@
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