问题
I am working on a Swift project in Xcode v6.1.1, and I am getting the following error that I don't understand. I believe there is a problem with a couple of the Labels in my Main.storyboard and/or the UILabel variable I have them connected to. I have tried everything I can find to fix it, and nothing has worked.
Any help would be appreciated.
2015-03-02 19:43:14.854 Final Project[7380:250494] -[UILabel longValue]: unrecognized selector sent to instance 0x7b8e1810
2015-03-02 19:43:14.876 Final Project[7380:250494] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UILabel longValue]: unrecognized selector sent to instance 0x7b8e1810'
*** First throw call stack:
(
0 CoreFoundation 0x00686946 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x02062a97 objc_exception_throw + 44
2 CoreFoundation 0x0068e5c5 -[NSObject(NSObject) doesNotRecognizeSelector:] + 277
3 CoreFoundation 0x005d73e7 ___forwarding___ + 1047
4 CoreFoundation 0x005d6fae _CF_forwarding_prep_0 + 14
5 Foundation 0x00b0b6dc _NSSetLongValueForKeyWithMethod + 69
6 Foundation 0x00a691c6 _NSSetUsingKeyValueSetter + 257
7 Foundation 0x00a690bd -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
8 Foundation 0x00a9e9a6 -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 386
9 UIKit 0x011cf649 -[UIRuntimeOutletConnection connect] + 106
10 libobjc.A.dylib 0x02078724 -[NSObject performSelector:] + 62
11 CoreFoundation 0x005c05dc -[NSArray makeObjectsPerformSelector:] + 316
12 UIKit 0x011ce10a -[UINib instantiateWithOwner:options:] + 1775
13 UIKit 0x00ff0624 -[UIViewController _loadViewFromNibNamed:bundle:] + 270
14 UIKit 0x00ff0dbb -[UIViewController loadView] + 295
15 UIKit 0x00ff0fef -[UIViewController loadViewIfRequired] + 78
16 UIKit 0x00ff1595 -[UIViewController view] + 35
17 UIKit 0x01664707 -[_UIFullscreenPresentationController _setPresentedViewController:] + 75
18 UIKit 0x00fc6a81 -[UIPresentationController initWithPresentedViewController:presentingViewController:] + 113
19 UIKit 0x00ffea61 -[UIViewController _presentViewController:withAnimationController:completion:] + 2102
20 UIKit 0x010015d2 __62-[UIViewController presentViewController:animated:completion:]_block_invoke + 345
21 UIKit 0x01001424 -[UIViewController presentViewController:animated:completion:] + 224
22 UIKit 0x010060be -[UIViewController _showViewController:withAction:sender:] + 213
23 UIKit 0x012423b5 -[UIStoryboardShowSegue perform] + 143
24 UIKit 0x014b6b49 -[UIStoryboardSegueTemplate _perform:] + 217
25 UIKit 0x014b6bc5 -[UIStoryboardSegueTemplate perform:] + 116
26 libobjc.A.dylib 0x020787cd -[NSObject performSelector:withObject:withObject:] + 84
27 UIKit 0x00e9b23d -[UIApplication sendAction:to:from:forEvent:] + 99
28 UIKit 0x00e9b1cf -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
29 UIKit 0x00fcee86 -[UIControl sendAction:to:forEvent:] + 69
30 UIKit 0x00fcf2a3 -[UIControl _sendActionsForEvents:withEvent:] + 598
31 UIKit 0x00fce50d -[UIControl touchesEnded:withEvent:] + 660
32 UIKit 0x00eeb60a -[UIWindow _sendTouchesForEvent:] + 874
33 UIKit 0x00eec0e5 -[UIWindow sendEvent:] + 791
34 UIKit 0x00eb1549 -[UIApplication sendEvent:] + 242
35 UIKit 0x00ec137e _UIApplicationHandleEventFromQueueEvent + 20690
36 UIKit 0x00e95b19 _UIApplicationHandleEventQueue + 2206
37 CoreFoundation 0x005aa1df __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
38 CoreFoundation 0x0059fced __CFRunLoopDoSources0 + 253
39 CoreFoundation 0x0059f248 __CFRunLoopRun + 952
40 CoreFoundation 0x0059ebcb CFRunLoopRunSpecific + 443
41 CoreFoundation 0x0059e9fb CFRunLoopRunInMode + 123
42 GraphicsServices 0x0441a24f GSEventRunModal + 192
43 GraphicsServices 0x0441a08c GSEventRun + 104
44 UIKit 0x00e998b6 UIApplicationMain + 1526
45 Final Project 0x000e904e top_level_code + 78
46 Final Project 0x000e908b main + 43
47 libdyld.dylib 0x027cfac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
回答1:
Have you forgot a : in the string name?
Is your class marked with @objc?
回答2:
Just by looking at -[UILabel longValue]: unrecognized selector sent to instance 0x7b8e1810 gives me the answer. You are treating a UILabel as an NSString.
Somewhere in your code you have [label longValue] where you mean to have [label.text longValue].
After looking at more of your call stack. I can see that it's happening while a while initializing a view controller from a storyboard.
Have you subclassed any views? It looks like you might have inadvertently changed the type of a property from NSString to UILabel.
回答3:
So... I fixed the problem. Turned out the answer was right in front of me the whole time (it usually is). The Label that couldn't be initialized had the same name as an Int variable I had declared in the same class, only with the first letter capitalized. For some reason, I assumed it was case-sensitive, so that wouldn't matter...
来源：https://stackoverflow.com/questions/28822289/swift-error-unrecognized-selector-sent-to-instance