我刚开始学习swift，而且我无法理解控制台试图通过此错误告诉我的内容。我正在按照Apple的指南学习swift，在“将UI连接到代码”部分中我遇到了以下问题：
2016-02-22 01:06:54.121 FoodTracker[20300:502503] <CATransformLayer: 0x7fab3973cb90> - changing property contentsCenter in transform-only layer, will have no effect
2016-02-22 01:06:54.127 FoodTracker[20300:502503] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<FoodTracker.ViewController 0x7fab394a9a00> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key setDefaultLabelText.'
*** First throw call stack:
(
0 CoreFoundation 0x00000001040b7e65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000105df7deb objc_exception_throw + 48
2 CoreFoundation 0x00000001040b7aa9 -[NSException raise] + 9
3 Foundation 0x00000001044809bb -[NSObject(NSKeyValueCoding) setValue:forKey:] + 288
4 UIKit 0x0000000104a63320 -[UIViewController setValue:forKey:] + 88
5 UIKit 0x0000000104c91f41 -[UIRuntimeOutletConnection connect] + 109
6 CoreFoundation 0x0000000103ff84a0 -[NSArray makeObjectsPerformSelector:] + 224
7 UIKit 0x0000000104c90924 -[UINib instantiateWithOwner:options:] + 1864
8 UIKit 0x0000000104a69eea -[UIViewController _loadViewFromNibNamed:bundle:] + 381
9 UIKit 0x0000000104a6a816 -[UIViewController loadView] + 178
10 UIKit 0x0000000104a6ab74 -[UIViewController loadViewIfRequired] + 138
11 UIKit 0x0000000104a6b2e7 -[UIViewController view] + 27
12 UIKit 0x0000000104941ab0 -[UIWindow addRootViewControllerViewIfPossible] + 61
13 UIKit 0x0000000104942199 -[UIWindow _setHidden:forced:] + 282
14 UIKit 0x0000000104953c2e -[UIWindow makeKeyAndVisible] + 42
15 UIKit 0x00000001048cc663 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4131
16 UIKit 0x00000001048d2cc6 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1760
17 UIKit 0x00000001048cfe7b -[UIApplication workspaceDidEndTransaction:] + 188
18 FrontBoardServices 0x0000000107c8c754 -[FBSSerialQueue _performNext] + 192
19 FrontBoardServices 0x0000000107c8cac2 -[FBSSerialQueue _performNextFromRunLoopSource] + 45
20 CoreFoundation 0x0000000103fe3a31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
21 CoreFoundation 0x0000000103fd995c __CFRunLoopDoSources0 + 556
22 CoreFoundation 0x0000000103fd8e13 __CFRunLoopRun + 867
23 CoreFoundation 0x0000000103fd8828 CFRunLoopRunSpecific + 488
24 UIKit 0x00000001048cf7cd -[UIApplication _run] + 402
25 UIKit 0x00000001048d4610 UIApplicationMain + 171
26 FoodTracker 0x0000000103ed947d main + 109
27 libdyld.dylib 0x000000010690092d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
此外，这是我正在运行的代码：
import UIKit
class ViewController: UIViewController {
//MARK: Propierties
@IBOutlet weak var nameTextField: UITextField!
@IBOutlet weak var mealNameLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
//MARK: Actions
@IBAction func setDefaultLabelText(sender: UIButton) {
mealNameLabel.text = "Default Text"
}
}
提前感谢您的帮助。期待它。
答案 0 :(得分：0)
已经解决了我的问题。当我刚刚开始编码时，我尝试复制并粘贴我写入新文件的内容，现在它完美无缺。没问题。它可能是配置中的一些错误。不管怎样，谢谢。