Question

我正在尝试创建一个UITableView，其中填充了所选日期的对象（具体为yesterday，today和tomorrow）。在我的CoreData模型中，有问题的实体作为属性date with type Date`。

要获得yesterday，today和tomorrow我这样做（按照this WWDC session的规定）：

var today = Date()
var yesterday = calendar.date(byAdding: .day, value: -1, to: self.date)
var tomorrow = calendar.date(byAdding: .day, value: 1, to: self.date)

并执行：

today = calendar.startOfDay(for: today)
yesterday = calendar.startOfDay(for: yesterday)
tomorrow = calendar.startOfDay(for: tomorrow)

一旦我得到所有日期，我不知道该怎么做。目前我的获取结果控制器看起来像：

    lazy var fetchedResultsController: NSFetchedResultsController<Entry> = {

        let fetchRequest: NSFetchRequest<Entry> = Entry.fetchRequest()

        // Configure Fetch Request
        fetchRequest.sortDescriptors = [NSSortDescriptor(key: "name", ascending: true)]

        // Create Fetched Results Controller
        let fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: app_delegate.persistentContainer.viewContext, sectionNameKeyPath: nil, cacheName: nil)

        // Configure Fetched Results Controller
        fetchedResultsController.delegate = self

        return fetchedResultsController
}()

如何将fetchedResultsController限制为其中一个日期，如果可能，我会使用Calendar方法执行此操作：isDateInToday()？

Answer 1

为获取请求添加谓词。

request.predicate = NSPredicate(format: "date > %@ && date < %@", 
   today as NSDate, tomorrow as NSDate)

如何将FetchedResultsController限制为给定日期内的对象

1 个答案: