ios - 信号 sigabrt 委托(delegate) -> AppDelegate.swift

Question

首先，对于这个可能有点简单/菜鸟的问题，我深表歉意。但是，我已经尝试调试此错误已有一段时间了。不幸的是，我最近开始使用 Xcode 和 Swift 工作。

我一直在关注在线类(class) Udemy 的教程。但是，插入代码后，我不断收到此错误:

Thread1: Signal SIGABRT

不知道可能是什么。我一直在谷歌上寻找 https://teamtreehouse.com/community/error-message-thread-1-signal-sigabrt-in-class-appdelegate

但这并没有解决我的问题:(

此外，很难理解到底发生了什么，所以我无法通过谷歌找到好的解决方案。也许你能帮帮我。

class ViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var statePicker: UIPickerView!
    @IBOutlet weak var statePickerBtn: UIButton!

    let states = ["Alaska","Arkansas","Alabama","California","New York"]

    override func viewDidLoad() {
        super.viewDidLoad()
        self.statePicker.dataSource = self
        statePicker.delegate = self

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

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

    @IBAction func stateBtnPressed(_ sender: AnyObject) {
        statePickerBtn.isHidden = false
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return states.count
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        return states[row]
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        statePickerBtn.setTitle(states[row], for: UIControlState.application)
        statePicker.isHidden = true
    }

我想做什么:我有一个隐藏的选择器，当用户按下按钮时，我希望它显示选择器。用户单击事件后，他们将看到带有数组的选择器。好吧，你知道我的意思。然而，当我构建它时，模拟器保持白色并且 Xcode 提示我 AppDelegate.Swift 并出现这个特定错误。

谢谢

Print screen of the error after I pressed Run. + Output, sorry for messy prnt scrn :)

控制台输出:

2017-03-01 18:03:39.717795 myPillsNoob[969:17168] subsystem: com.apple.UIKit, category: HIDEventFiltered, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2017-03-01 18:03:39.725996 myPillsNoob[969:17168] subsystem: com.apple.UIKit, category: HIDEventIncoming, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2017-03-01 18:03:39.738908 myPillsNoob[969:17165] subsystem: com.apple.BaseBoard, category: MachPort, enable_level: 1, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 0, privacy_setting: 0, enable_private_data: 0
2017-03-01 18:03:39.760737 myPillsNoob[969:17069] subsystem: com.apple.UIKit, category: StatusBar, enable_level: 0, persist_level: 0, default_ttl: 0, info_ttl: 0, debug_ttl: 0, generate_symptoms: 0, enable_oversize: 1, privacy_setting: 2, enable_private_data: 0
2017-03-01 18:03:39.849 myPillsNoob[969:17069] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<myPillsNoob.ViewController 0x7fa24ce09160> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key stateButtonPressed.'
*** First throw call stack:
(
    0   CoreFoundation                      0x00000001132e234b __exceptionPreprocess + 171
    1   libobjc.A.dylib                     0x000000011038f21e objc_exception_throw + 48
    2   CoreFoundation                      0x00000001132e2299 -[NSException raise] + 9
    3   Foundation                          0x000000010fe9f2ff -[NSObject(NSKeyValueCoding) setValue:forKey:] + 291
    4   UIKit                               0x00000001109f88c3 -[UIViewController setValue:forKey:] + 88
    5   UIKit                               0x0000000110c6cbe6 -[UIRuntimeOutletConnection connect] + 109
    6   CoreFoundation                      0x0000000113287590 -[NSArray makeObjectsPerformSelector:] + 256
    7   UIKit                               0x0000000110c6b56a -[UINib instantiateWithOwner:options:] + 1867
    8   UIKit                               0x00000001109feff5 -[UIViewController _loadViewFromNibNamed:bundle:] + 386
    9   UIKit                               0x00000001109ff917 -[UIViewController loadView] + 177
    10  UIKit                               0x00000001109ffc4c -[UIViewController loadViewIfRequired] + 201
    11  UIKit                               0x0000000110a004a0 -[UIViewController view] + 27
    12  UIKit                               0x00000001108ca045 -[UIWindow addRootViewControllerViewIfPossible] + 71
    13  UIKit                               0x00000001108ca796 -[UIWindow _setHidden:forced:] + 293
    14  UIKit                               0x00000001108de0a9 -[UIWindow makeKeyAndVisible] + 42
    15  UIKit                               0x0000000110857259 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4818
    16  UIKit                               0x000000011085d3b9 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1731
    17  UIKit                               0x000000011085a539 -[UIApplication workspaceDidEndTransaction:] + 188
    18  FrontBoardServices                  0x000000011477b76b __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 24
    19  FrontBoardServices                  0x000000011477b5e4 -[FBSSerialQueue _performNext] + 189
    20  FrontBoardServices                  0x000000011477b96d -[FBSSerialQueue _performNextFromRunLoopSource] + 45
    21  CoreFoundation                      0x0000000113287311 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
    22  CoreFoundation                      0x000000011326c59c __CFRunLoopDoSources0 + 556
    23  CoreFoundation                      0x000000011326ba86 __CFRunLoopRun + 918
    24  CoreFoundation                      0x000000011326b494 CFRunLoopRunSpecific + 420
    25  UIKit                               0x0000000110858db6 -[UIApplication _run] + 434
    26  UIKit                               0x000000011085ef34 UIApplicationMain + 159
    27  myPillsNoob                         0x000000010fdb071f main + 111
    28  libdyld.dylib                       0x0000000113fe568d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

Answer 1

最重要的错误信息是:

this class is not key value coding-compliant for the key stateButtonPressed.

• 按⇧⌘F。
• 搜索 stateButtonPressed。这很可能是 Interface Builder 中的死连接。
• 删除连接。