Swift-CoreData-DetailViewController-传递对象

Question

I'm creating a CoreData project. I used the Master / Detail template from XCode6 (beta 5). I've studied it for the past few days, and I'm confused on the anyObject? that it uses. I am passing it an Event. As I did with Objective-C, I'd like to use Event.eventName in lieu of detail.valueForKey("eventName").description

I have tried numerous attempts and I now have something that works. But does it work properly? Is there a way to pass an Event (object) to the DetailViewController in a better (or more efficient) way than what I have?

import UIKit

class DetailViewController: UIViewController
{
    @IBOutlet var textFieldEventName: UITextField!
    @IBOutlet var textFieldStartDate: UITextField!
    @IBOutlet var textFieldEndDate: UITextField!
    @IBOutlet var labelNumberOfDays: UILabel!

    var currentEvent: Event!

    required init(coder aDecoder: NSCoder!)
    {
        super.init(coder: aDecoder)
    }

    override func viewDidLoad()
    {
        super.viewDidLoad()
        updateDisplay()
    }

    func updateDisplay()
    {
        if let textField = self.textFieldEventName
        {
            textFieldEventName.text = currentEvent.eventName
            textFieldStartDate.text = currentEvent.startDate
            textFieldEndDate.text = currentEvent.endDate
            labelNumberOfDays.text = "\(currentEvent.orderNumber)"
        }
    }
}

Answer 1

Please see the relevant Swift documentation bit on Type Casting for Any and AnyObject . In your case, here is one option:

let detail: Event = self.detailItem as Event

This is really extremely basic and you should read the Swift book a bit more before coding by example.