erminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<ËÆ°ÁÆóÊú∫ios2.ViewController 0x7feb09d345d0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key Num2.'
*** First throw call stack:
(
0 CoreFoundation 0x000000010847ac65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000109fe5bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010847a8a9 -[NSException raise] + 9
3 Foundation 0x0000000108898b53 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
4 CoreFoundation 0x00000001083c2d50 -[NSArray makeObjectsPerformSelector:] + 224
5 UIKit 0x0000000108ff152b -[UINib instantiateWithOwner:options:] + 1506
6 UIKit 0x0000000108e49718 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
7 UIKit 0x0000000108e49d08 -[UIViewController loadView] + 109
8 UIKit 0x0000000108e49f79 -[UIViewController loadViewIfRequired] + 75
9 UIKit 0x0000000108e4a40e -[UIViewController view] + 27
10 UIKit 0x0000000108d652c9 -[UIWindow addRootViewControllerViewIfPossible] + 58
11 UIKit 0x0000000108d6568f -[UIWindow _setHidden:forced:] + 247
12 UIKit 0x0000000108d71e21 -[UIWindow makeKeyAndVisible] + 42
13 UIKit 0x0000000108d15457 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 2732
14 UIKit 0x0000000108d181de -[UIApplication _runWithMainScene:transitionContext:completion:] + 1349
15 UIKit 0x0000000108d170d5 -[UIApplication workspaceDidEndTransaction:] + 179
16 FrontBoardServices 0x000000010baf55e5 __31-[FBSSerialQueue performAsync:]_block_invoke_2 + 21
17 CoreFoundation 0x00000001083ae41c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
18 CoreFoundation 0x00000001083a4165 __CFRunLoopDoBlocks + 341
19 CoreFoundation 0x00000001083a3947 __CFRunLoopRun + 887
20 CoreFoundation 0x00000001083a3366 CFRunLoopRunSpecific + 470
21 UIKit 0x0000000108d16b42 -[UIApplication _run] + 413
22 UIKit 0x0000000108d19900 UIApplicationMain + 1282
23 ËÆ°ÁÆóÊú∫ios2 0x00000001082934a7 main + 135
24 libdyld.dylib 0x000000010a73d145 start + 1
25 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

使用键值编码时无法找到对应的字段而导致的异常。