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我的代码有问题。任何人都可以帮助我吗？

错误：2015-12-10 19:57:58.890 time[1177:36084] *** 由于未捕获的异常“NSUnknownKeyException”而终止应用程序，原因：
 '[<time.ViewController 0x79122de0> setValue:forUndefinedKey:]: 这个
 类不符合键显示的键值编码。
     *** 首先抛出调用堆栈：
     (
        0 CoreFoundation 0x001fea14 __exceptionPreprocess + 180
        1 libobjc.A.dylib 0x01eafe02 objc_exception_throw + 50
        2 核心基础 0x001fe631 -[NSException 引发] + 17
        3 基础 0x006501bc -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
        4 基础 0x005aa83a _NSSetUsingKeyValueSetter + 115
        5 基础 0x005aa7bf -[NSObject(NSKeyValueCoding) setValue:forKey:] + 295
        6 UIKit 0x00ba306d-[UIViewController setValue:forKey:] + 85
        7 基础 0x005df01d -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 384
        8 UIKit 0x00e16cb4-[UIRuntimeOutletConnection 连接] + 132
        9 libobjc.A.dylib 0x01ec400c -[NSObject performSelector:] + 62
        10 核心基础 0x0012ef51 -[NSArray makeObjectsPerformSelector:] + 273
        11 UIKit 0x00e1534e-[UINib 实例化WithOwner：选项：] + 2102
        12 UIKit 0x00baaabc-[UIViewController _loadViewFromNibNamed:bundle:] + 429
        13 UIKit 0x00bab4f4-[UIViewController 加载视图] + 189
        14 UIKit 0x00bab900 -[UIViewController loadViewIfRequired] + 154
        15 UIKit 0x00bac1ed-[UIViewController 视图] + 35
        16 UIKit 0x00a59f94 -[UIWindow addRootViewControllerViewIfPossible] + 69
        17 UIKit 0x00a5a6b1 -[UIWindow _setHidden:forced:] + 304
        18 UIKit 0x00a5aa67 -[UIWindow _orderFrontWithoutMakingKey] + 49
        19 UIKit 0x00a6e118 -[UIWindow makeKeyAndVisible] + 80
        20 UIKit 0x009d66e7-[UIApplication_callInitializationDelegatesForMainScene:transitionContext:] + 4190
        21 UIKit 0x009ddcd6-[UIApplication_runWithMainScene:transitionContext:completion:] + 1989
        22 UIKit 0x00a02ee5 __84-[UIApplication_handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke3218 + 68
        23 UIKit 0x009da966 -[UIApplication 工作区DidEndTransaction：] + 163
        24 FrontBoardServices 0x03c37c76 __37-[FBSWorkspace clientEndTransaction:]_block_invoke_2 + 71
        25 FrontBoardServices 0x03c3774d __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 54
        26 前板服务 0x03c55173 -[FBSSerialQueue _performNext] + 184
        27 前板服务 0x03c555aa -[FBSSerialQueue _performNextFromRunLoopSource] + 52
        28 前板服务 0x03c548a6 FBSSerialQueueRunLoopSourceHandler + 33
        29 核心基础 0x001186ff __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
        30 核心基础 0x0010e38b __CFRunLoopDoSources0 + 523
        31 核心基础 0x0010d7a8 __CFRunLoopRun + 1032
        32 核心基础 0x0010d0e6 CFRunLoopRunSpecific + 470
        33 核心基础 0x0010cefb CFRunLoopRunInMode + 123
        34 UIKit 0x009da206 -[UIApplication_run] + 540
        35 UIKit 0x009dfbfa UIApplicationMain + 160
        36 次 0x0001940c 主 + 140
        37 libdyld.dylib 0x02913a21 开始 + 1
     )
     libc++abi.dylib：以 NSException 类型的未捕获异常终止
     (lldb)

我的代码是：

//
//  ViewController.swift
//  time
//
//  Created by Marek on 09.12.15.
//  Copyright © 2015 Marek. All rights reserved.
//
import CoreFoundation
import CoreGraphics
import Darwin
import Foundation
import UIKit

class ViewController: UIViewController {


    @IBOutlet weak var currentTimeLabel: UILabel!

        var timer = NSTimer()

        override func viewDidLoad() {
            super.viewDidLoad()

            // Do any additional setup after loading the view, typically from a nib.

            self.timer = NSTimer.scheduledTimerWithTimeInterval(
                1.0,
                target: self,
                selector: Selector("tick"),
                userInfo: nil,
                repeats: true)
        }

        @objc func tick() {
            currentTimeLabel.text = NSDateFormatter.localizedStringFromDate(NSDate(),
                dateStyle: .MediumStyle,
                timeStyle: .MediumStyle)
        }
    }
4

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