当我启动应用程序并在启动时快速点击屏幕时会发生这种情况。我在堆栈跟踪中没有任何线索，因为它全部在框架内。我担心它可能与ReactiveCocoa 2.0有关。
错误
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<NSConcreteValue 0x40857fe0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key x_60288.'
堆栈跟踪
0 CoreFoundation 0x036c45e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x034478b6 objc_exception_throw + 44
2 CoreFoundation 0x037546a1 -[NSException raise] + 17
3 Foundation 0x015b98ca -[NSObject(NSKeyValueCoding) valueForUndefinedKey:] + 282
4 Foundation 0x01526921 _NSGetUsingKeyValueGetter + 81
5 Foundation 0x01525f5b -[NSObject(NSKeyValueCoding) valueForKey:] + 260
6 Foundation 0x01545a02 -[NSObject(NSKeyValueCoding) valueForKeyPath:] + 321
7 QuartzCore 0x02379bfb CAObject_valueForKeyPath_ + 2797
8 QuartzCore 0x02379ead CAObject_valueForKeyPath + 147
9 QuartzCore 0x0235ff4f -[CALayer valueForKeyPath:] + 24
10 UIKit 0x0262da96 _UIViewLayerAnimationCanBeConsideredFinished + 91
11 UIKit 0x026161c5 __22-[UIWindow sendEvent:]_block_invoke + 36
12 CoreFoundation 0x0374105d __53-[__NSArrayI enumerateObjectsWithOptions:usingBlock:]_block_invoke + 61
13 CoreFoundation 0x03740f92 -[__NSArrayI enumerateObjectsWithOptions:usingBlock:] + 258
14 CoreFoundation 0x036be0a5 -[NSArray enumerateObjectsUsingBlock:] + 53
15 UIKit 0x02615fa3 -[UIWindow sendEvent:] + 751
16 UIKit 0x025e9e86 -[UIApplication sendEvent:] + 242
17 UIKit 0x025d418f _UIApplicationHandleEventQueue + 11421
18 CoreFoundation 0x0364d83f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
19 CoreFoundation 0x0364d1cb __CFRunLoopDoSources0 + 235
20 CoreFoundation 0x0366a29e __CFRunLoopRun + 910
21 CoreFoundation 0x03669ac3 CFRunLoopRunSpecific + 467
22 CoreFoundation 0x036698db CFRunLoopRunInMode + 123
23 GraphicsServices 0x04c729e2 GSEventRunModal + 192
24 GraphicsServices 0x04c72809 GSEventRun + 104
25 UIKit 0x025d6d3b UIApplicationMain + 1225
26 IVYCore 0x00003242 main + 178
27 IVYCore 0x00003185 start + 53
这个答案不重复，因为