Question

所以我通过在线发现的教程制作了一个简单的秒表应用程序。我按照ford的代码字创建了一个用于连接它的UI。但是，每当我尝试运行程序时，iOS模拟器都无法通过显示应用程序名称的屏幕。然后它产生了大量的代码，并强调了这一点：

class AppDelegate: UIResponder, UIApplicationDelegate {`

表示THREAD 1: signal SIGABRT

这是什么意思？

同样在控制台中我收到此消息：

（提前为大量代码道歉，标记它似乎不起作用）

2015-06-15 15:53:54.313 stopwatch2[20524:1296474] ***   Terminating    app due to uncaught exception 'NSUnknownKeyException', reason:     '[<stopwatch2.ViewController 0x7f9280476960> setValue:forUndefinedKey:]:   this class is not key value coding-compliant for the key display.'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010fcecc65 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x0000000111857bb7 objc_exception_throw + 45
    2   CoreFoundation                      0x000000010fcec8a9 -[NSException raise] + 9
    3   Foundation                          0x000000011010ab53 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
    4   CoreFoundation                      0x000000010fc34d50 -[NSArray makeObjectsPerformSelector:] + 224
    5   UIKit                               0x000000011086352b -[UINib instantiateWithOwner:options:] + 1506
    6   UIKit                               0x00000001106bb718 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
    7   UIKit                               0x00000001106bbd08 -[UIViewController loadView] + 109
    8   UIKit                               0x00000001106bbf79 -[UIViewController loadViewIfRequired] + 75
    9   UIKit                               0x00000001106bc40e -[UIViewController view] + 27
   10  UIKit                               0x00000001105d72c9 -[UIWindow addRootViewControllerViewIfPossible] + 58
   11  UIKit                               0x00000001105d768f -[UIWindow _setHidden:forced:] + 247
   12  UIKit                               0x00000001105e3e21 -[UIWindow makeKeyAndVisible] + 42
   13  UIKit                               0x0000000110587457 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2732
   14  UIKit                               0x000000011058a1de -[UIApplication _runWithMainScene:transitionContext:completion:] + 1349
   15  UIKit                               0x00000001105890d5 -[UIApplication workspaceDidEndTransaction:] + 179
   16  FrontBoardServices                  0x00000001133675e5 __31-[FBSSerialQueue performAsync:]_block_invoke_2 + 21
   17  CoreFoundation                      0x000000010fc2041c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
   18  CoreFoundation                      0x000000010fc16165 __CFRunLoopDoBlocks + 341
   19  CoreFoundation                      0x000000010fc15f25 __CFRunLoopRun + 2389
   20  CoreFoundation                      0x000000010fc15366 CFRunLoopRunSpecific + 470
   21  UIKit                               0x0000000110588b42 -[UIApplication _run] + 413
   22  UIKit                               0x000000011058b900 UIApplicationMain + 1282
   23  stopwatch2                          0x000000010faf0ff7 main + 135
   24  libdyld.dylib                       0x0000000111faf145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException   
(lldb)

但是，这是我的实际代码：

import UIKit

class ViewController: UIViewController {

    var timer = NSTimer()
    var count = 0
    func updateTime() {
        count++
        time.text = "\(count)"
    }

    @IBOutlet var time: UILabel!

    @IBAction func pause(sender: AnyObject) {
        timer.invalidate()
    }

    @IBAction func stop(sender: AnyObject) {
        timer.invalidate()
        count = 0
        time.text = "0"
    }

    @IBAction func start(sender: AnyObject) {
        timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateTime"),userInfo: nil, repeats: true)
    }

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

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

有人请帮忙吗？

Answer 1

You probably connected an object called display to your View Controller, but then removed/changed the property in the source code.

You have to go to your controller in the Storyboard, click the outlets icon and delete the display outlet, it will have an exclamation mark.

StopWatch应用不断崩溃

1 个答案: