最佳答案
                                        
                                                                        
                                我正在Swift中编写一个应用程序,当我在iPhone模拟器上运行测试应用程序时,一切正常,但随后我尝试向右滑动,这是我为它添加的一个手势,以转到下一页(View Controller Two)。它崩溃了,并在控制台日志中显示此错误报告。
2014-10-18 12:07:34.400 soundtest[17081:818922] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<soundtest.ViewControllerTwo 0x7f92f1f20090> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key sfdfa.'
*** First throw call stack:
(
0   CoreFoundation                      0x00000001067813f5 __exceptionPreprocess + 165
1   libobjc.A.dylib                     0x00000001082afbb7 objc_exception_throw + 45
2   CoreFoundation                      0x0000000106781039 -[NSException raise] + 9
3   Foundation                          0x0000000106b984d3 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
4   CoreFoundation                      0x00000001066cb400 -[NSArray makeObjectsPerformSelector:] + 224
5   UIKit                               0x00000001072ce97d -[UINib instantiateWithOwner:options:] + 1506
6   UIKit                               0x000000010712f698 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
7   UIKit                               0x000000010712fc88 -[UIViewController loadView] + 109
8   UIKit                               0x000000010712fef9 -[UIViewController loadViewIfRequired] + 75
9   UIKit                               0x000000010713038e -[UIViewController view] + 27
10  UIKit                               0x00000001076cd83f -[_UIFullscreenPresentationController _setPresentedViewController:] + 65
11  UIKit                               0x000000010710bc49 -[UIPresentationController initWithPresentedViewController:presentingViewController:] + 105
12  UIKit                               0x000000010713c121 -[UIViewController _presentViewController:withAnimationController:completion:] + 1746
13  UIKit                               0x000000010713e461 __62-[UIViewController presentViewController:animated:completion:]_block_invoke + 132
14  UIKit                               0x000000010713e385 -[UIViewController presentViewController:animated:completion:] + 229
15  UIKit                               0x00000001073bb9d6 _UIGestureRecognizerSendActions + 262
16  UIKit                               0x00000001073ba679 -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 532
17  UIKit                               0x00000001073bf296 ___UIGestureRecognizerUpdate_block_invoke662 + 51
18  UIKit                               0x00000001073bf192 _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 254
19  UIKit                               0x00000001073b520d _UIGestureRecognizerUpdate + 2796
20  UIKit                               0x00000001070520a6 -[UIWindow _sendGesturesForEvent:] + 1041
21  UIKit                               0x0000000107052cd3 -[UIWindow sendEvent:] + 667
22  UIKit                               0x000000010701fae1 -[UIApplication sendEvent:] + 246
23  UIKit                               0x000000010702cbad _UIApplicationHandleEventFromQueueEvent + 17370
24  UIKit                               0x0000000107008233 _UIApplicationHandleEventQueue + 1961
25  CoreFoundation                      0x00000001066b6ad1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
26  CoreFoundation                      0x00000001066ac99d __CFRunLoopDoSources0 + 269
27  CoreFoundation                      0x00000001066abfd4 __CFRunLoopRun + 868
28  CoreFoundation                      0x00000001066aba06 CFRunLoopRunSpecific + 470
29  GraphicsServices                    0x000000010a1699f0 GSEventRunModal + 161
30  UIKit                               0x000000010700b550 UIApplicationMain + 1282
31  soundtest                           0x000000010624503e top_level_code + 78
32  soundtest                           0x000000010624507a main + 42
33  libdyld.dylib                       0x000000010ae4a145 start + 1
34  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
 
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                             
                                
                            