Xcode中意外的生成錯誤

Question

我正在嘗試使用swift作為一個小型個人項目在Xcode v6.2中構建iOS應用。 到目前為止，我已經將自己的研究成果整理到一起，但是當我嘗試構建時，以下代碼引發錯誤。 快速構建完整的應用程序超出了我的知識范圍，因此我希望有人能夠朝着正確的方向引導我，這是顯而易見的。

目的只是為了填充選擇器視圖，因此，如果有一些更簡單的邏輯，我就不會以任何方式綁定到代碼。

這是代碼：

import UIKit
import iAd
import QuartzCore


class ViewController: UIViewController, ADBannerViewDelegate, UIPickerViewDataSource, UIPickerViewDelegate{

@IBOutlet weak var yearPicker: UIPickerView!
@IBOutlet weak var yearLabel: UILabel!


    let listView = ["2013", "2014", "2015"]
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        println("Entering super.viewDidload() function")
        yearPicker.delegate = self
        yearPicker.dataSource = self
    }

    //Data Sources
    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return listView.count
    }

    //Delegates
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        return listView[row]
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        yearLabel.text = listView[row]
    }

override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}

我收到的錯誤是：

致命錯誤：解開Optional值時意外發現nil

並且它在IDE中突出顯示了以下幾行：

yearPicker.delegate = self

如果還有其他可能有用的方法，請告訴我。

Answer 1

因此，我最終再次開始，通過ctrl創建連接並拖動到編輯器中以創建@IBOutlet連接。

然后，我刪除了.delegate和.dataSource方法，因為收到一條錯誤消息，指出yearPicker沒有這些成員。 所以現在我剩下的代碼可以完美工作了:)

感謝Abizern使我走上正確的道路。

import UIKit
import iAd
import QuartzCore


class ViewController: UIViewController, ADBannerViewDelegate, UIPickerViewDataSource, UIPickerViewDelegate{

    @IBOutlet var yearPicker: [UIPickerView]!
    @IBOutlet weak var yearLabel: UILabel!

    let listView = ["2013", "2014", "2015"]
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    //Data Sources
    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        return 1
    }
    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return listView.count
    }

    //Delegates
    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        return listView[row]
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        yearLabel.text = listView[row]
        }

override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}