ios - 我的应用程序无法运行...因为 AppDelegate 未更改？

Question

我的应用程序运行良好，直到我添加了 @IBAction .现在我得到这个错误:

2017-06-09 07:55:35.285 Press[1594:102051] * Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key add.' * First throw call stack: ( 0 CoreFoundation 0x000000010724bb0b exceptionPreprocess + 171 1 libobjc.A.dylib 0x00000001044f3141 objc_exception_throw + 48 2 CoreFoundation 0x000000010724ba59 -[NSException raise] + 9 3 Foundation 0x0000000104008e8b -[NSObject(NSKeyValueCoding) setValue:forKey:] + 292 4 UIKit 0x0000000104b60644 -[UIViewController setValue:forKey:] + 87 5 UIKit 0x0000000104dcd6b9 -[UIRuntimeOutletConnection connect] + 109 6 CoreFoundation 0x00000001071f1e8d -[NSArray makeObjectsPerformSelector:] + 269 7 UIKit 0x0000000104dcc06f -[UINib instantiateWithOwner:options:] + 1856 8 UIKit 0x0000000104b66c73 -[UIViewController _loadViewFromNibNamed:bundle:] + 381 9 UIKit 0x0000000104b67589 -[UIViewController loadView] + 177 10 UIKit 0x0000000104b678ba -[UIViewController loadViewIfRequired] + 195 11 UIKit 0x0000000104b6810a -[UIViewController view] + 27 12 UIKit 0x0000000104a3063a -[UIWindow addRootViewControllerViewIfPossible] + 65 13 UIKit 0x0000000104a30d20 -[UIWindow _setHidden:forced:] + 294 14 UIKit 0x0000000104a43b6e -[UIWindow makeKeyAndVisible] + 42 15 UIKit 0x00000001049bd31f -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4346 16 UIKit 0x00000001049c3584 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1709 17 UIKit 0x00000001049c0793 -[UIApplication workspaceDidEndTransaction:] + 182 18 FrontBoardServices 0x000000010895b5f6 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK + 24 19 FrontBoardServices 0x000000010895b46d -[FBSSerialQueue _performNext] + 186 20 FrontBoardServices 0x000000010895b7f6 -[FBSSerialQueue _performNextFromRunLoopSource] + 45 21 CoreFoundation 0x00000001071f1c01 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 22 CoreFoundation 0x00000001071d70cf __CFRunLoopDoSources0 + 527 23 CoreFoundation 0x00000001071d65ff __CFRunLoopRun + 911 24 CoreFoundation 0x00000001071d6016 CFRunLoopRunSpecific + 406 25 UIKit 0x00000001049bf02f -[UIApplication _run] + 468 26 UIKit 0x00000001049c50d4 UIApplicationMain + 159 27 Press 0x0000000103f1a877 main + 55 28 libdyld.dylib 0x00000001081eb65d start + 1 29 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException

这是我的 View Controller 代码:

import UIKit

class ViewController: UIViewController {

// OUTLETS

@IBOutlet weak var score: UILabel!
@IBAction func add(_ sender: Any) {
    add()
}

// VARIABLES

var scoreVar = 0
let levelUpAt = [50, 100, 500, 1000, 5000, 10000, 50000, 100000]
var currentLevel = 1
var toAdd = 1

// OVERRIDES

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

// FUNCTIONS

// Below code adds to the score

func add() {
    scoreVar += 1 // Adds 1 to scoreVar
    score.text = "scoreVar"; // Updates text to match
    checkForLevelUp(); // Calls the function defined in the next few days ago
}

// Below code checks if the score meets the next level requirements

func checkForLevelUp() {
    if (scoreVar - 1 < levelUpAt[currentLevel - 1]) { // Complicated math-y if statment
        currentLevel += 1
        toAdd += 1
    }
}

}

好像卡在 class AppDelegate: UIResponder, UIApplicationDelegate {根据调试器，AppDelegate 上的行。

Answer 1

转到您的 Storyboard并单击 ViewController。单击您创建的添加按钮之一。



在 Outlet Inspector 的右侧，删除任何提及“添加”按钮的内容。



最后，通过将选项从按钮拖到 View Controller 并将类型设置为“操作”来重新创建 socket 。