Segue无法在视图控制器中执行，
我试过了：
UIViewController *toViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"menu"];
[self.navigationController pushViewController:toViewController animated:YES];
和
[self performSegueWithIdentifier: @"sidebar_segue" sender:self];
两者但它给了我一个错误，如
-[__NSCFNumber length]: unrecognized selector sent to instance 0xb89f1b0
2014-06-10 13:05:11.328 naanking[1720:60b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFNumber length]: unrecognized selector sent to instance 0xb89f1b0'
*** First throw call stack:
(
0 CoreFoundation 0x028431e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x01e548e5 objc_exception_throw + 44
2 CoreFoundation 0x028e0243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x0283350b ___forwarding___ + 1019
4 CoreFoundation 0x028330ee _CF_forwarding_prep_0 + 14
5 UIKit 0x00ac4463 -[UILabel _shadow] + 45
6 UIKit 0x00ac58c2 -[UILabel drawTextInRect:] + 70
7 UIKit 0x00ac7dfc -[UILabel drawRect:] + 98
8 UIKit 0x00976453 -[UIView(CALayerDelegate) drawLayer:inContext:] + 504
9 QuartzCore 0x004a7f39 -[CALayer drawInContext:] + 123
10 QuartzCore 0x004a7e6a _ZL16backing_callbackP9CGContextPv + 96
11 QuartzCore 0x003964fc CABackingStoreUpdate_ + 2656
12 QuartzCore 0x004a7e02 ___ZN2CA5Layer8display_Ev_block_invoke + 93
13 QuartzCore 0x004dc2d7 x_blame_allocations + 15
14 QuartzCore 0x004a7c6d _ZN2CA5Layer8display_Ev + 1519
15 QuartzCore 0x004a7eb9 -[CALayer _display] + 33
16 QuartzCore 0x004a7676 _ZN2CA5Layer7displayEv + 144
17 QuartzCore 0x004a7e93 -[CALayer display] + 33
18 QuartzCore 0x0049c043 _ZN2CA5Layer17display_if_neededEPNS_11TransactionE + 323
19 QuartzCore 0x0049c0bc _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 38
20 QuartzCore 0x004027fa _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294
21 QuartzCore 0x00403b85 _ZN2CA11Transaction6commitEv + 393
22 QuartzCore 0x004c15b0 +[CATransaction flush] + 52
23 UIKit 0x009059bb _UIApplicationHandleEventQueue + 13095
24 CoreFoundation 0x027cc77f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
25 CoreFoundation 0x027cc10b __CFRunLoopDoSources0 + 235
26 CoreFoundation 0x027e91ae __CFRunLoopRun + 910
27 CoreFoundation 0x027e89d3 CFRunLoopRunSpecific + 467
28 CoreFoundation 0x027e87eb CFRunLoopRunInMode + 123
29 GraphicsServices 0x0276c5ee GSEventRunModal + 192
30 GraphicsServices 0x0276c42b GSEventRun + 104
31 UIKit 0x00907f9b UIApplicationMain + 1225
32 naanking 0x0001cccd main + 141
33 naanking 0x000029d5 start + 53
)
libc++abi.dylib: terminating with uncaught exception of type NSException
..................................