使用核心数据关系和segues

Question

在我的应用程序中，我试图显示我通过prepareForSegue的特定药物的日期。比我想准备一个包含日期只与医学名称相关的日期的数组。如何准备这样的抓取？

我的模特：

extension Dates {

@NSManaged var date: NSDate?
@NSManaged var takes: Medicine?

}

extension Medicine {

@NSManaged var amount: String?
@NSManaged var endDate: String?
@NSManaged var name: String?
@NSManaged var time: String?
@NSManaged var notificationSet: NSNumber?
@NSManaged var taken: NSOrderedSet?

}

在viewDidLoad中，我尝试像这样准备这个数组：

var context = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext
let fetchRequestDate = NSFetchRequest(entityName: "Dates")
let fetchRequestMedicine = NSFetchRequest(entityName: "Medicine")


var medicine : Medicine?

var dates = [NSDate]()

override func viewDidLoad() {
    super.viewDidLoad()
    do {

        fetchRequestDate.predicate = NSPredicate(format: "takes.name == %@ ", medicine!.name!)

        let resultsDates  = try context.executeFetchRequest(fetchRequestDate)

        for date in resultsDates {
            print(date)
        }


    } catch let error as NSError {
        print(error.userInfo)
    }

稍后在此功能中使用它：

func calendar(calendar: CKCalendarView!, configureDateItem dateItem: CKDateItem!, forDate date: NSDate!) {

    for dateTaken in dates {
        if calendar.date(date, isSameDayAsDate: dateTaken) {
            dateItem.backgroundColor = UIColor.redColor()
        }
    }

}