libc ++ abi.dylib：以NSException类型的未捕获异常终止（lldb）

Question

错误是指我的main.m，不知道该怎么做才能修复，尝试了很多。

int main(int argc, char * argv[]) {
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

感谢帮助。 这是崩溃日志：

2014-12-31 01:49:28.838 iChat[4855:142422] Failed to instantiate the default view controller for UIMainStoryboardFile 'Main' - perhaps the designated entry point is not set?
2014-12-31 01:49:28.922 iChat[4855:142422] Application windows are expected to have a root view controller at the end of application launch
2014-12-31 01:49:30.342 iChat[4855:142422] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<LoginViewController 0x7f8763d77870> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key forgotPasswordButton.'
*** First throw call stack:
(
    0   CoreFoundation                      0x000000010a627f35 __exceptionPreprocess + 165
    1   libobjc.A.dylib                     0x000000010a2c0bb7 objc_exception_throw + 45
    2   CoreFoundation                      0x000000010a627b79 -[NSException raise] + 9
    3   Foundation                          0x00000001074477b3 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 259
    4   CoreFoundation                      0x000000010a571e80 -[NSArray makeObjectsPerformSelector:] + 224
    5   UIKit                               0x0000000107b80c7d -[UINib instantiateWithOwner:options:] + 1506
    6   UIKit                               0x00000001079dff98 -[UIViewController _loadViewFromNibNamed:bundle:] + 242
    7   UIKit                               0x00000001079e0588 -[UIViewController loadView] + 109
    8   UIKit                               0x00000001079e07f9 -[UIViewController loadViewIfRequired] + 75
    9   UIKit                               0x0000000107a0f06b -[UINavigationController _layoutViewController:] + 44
    10  UIKit                               0x0000000107a0f5b5 -[UINavigationController _updateScrollViewFromViewController:toViewController:] + 216
    11  UIKit                               0x0000000107a0f6b4 -[UINavigationController _startTransition:fromViewController:toViewController:] + 92
    12  UIKit                               0x0000000107a10487 -[UINavigationController _startDeferredTransitionIfNeeded:] + 523
    13  UIKit                               0x0000000107a10f47 -[UINavigationController __viewWillLayoutSubviews] + 43
    14  UIKit                               0x0000000107b56509 -[UILayoutContainerView layoutSubviews] + 202
    15  UIKit                               0x0000000107934973 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 521
    16  QuartzCore                          0x0000000106bbcde8 -[CALayer layoutSublayers] + 150
    17  QuartzCore                          0x0000000106bb1a0e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380
    18  QuartzCore                          0x0000000106bb187e _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24
    19  QuartzCore                          0x0000000106b1f63e _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 242
    20  QuartzCore                          0x0000000106b2074a _ZN2CA11Transaction6commitEv + 390
    21  UIKit                               0x00000001078de022 _afterCACommitHandler + 123
    22  CoreFoundation                      0x000000010a55cdc7 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
    23  CoreFoundation                      0x000000010a55cd20 __CFRunLoopDoObservers + 368
    24  CoreFoundation                      0x000000010a552b53 __CFRunLoopRun + 1123
    25  CoreFoundation                      0x000000010a552486 CFRunLoopRunSpecific + 470
    26  GraphicsServices                    0x000000010bccd9f0 GSEventRunModal + 161
    27  UIKit                               0x00000001078bb420 UIApplicationMain + 1282
    28  iSociety                            0x00000001065a8b83 main + 115
    29  libdyld.dylib                       0x000000010b822145 start + 1
    30  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

现在我知道它将来自LoginViewController，因为这是用户登录的初始控制器，但是有一些按钮，用户可以在其中注册＆＃34;或者＆＃34;忘记了密码＆＃34;。起初，每次尝试点击注册时它都会崩溃，但很快就会崩溃。

Answer 1

如果您可以发布崩溃日志以及问题，那会更好。

但大多数情况下，由于与 XIB / Storyboard 的悬空连接而发生此错误：

删除此连接，其中包含＆＃34;！＆＃34;感叹号就可以了。

更新：另一个原因：

如果忘记将初始视图控制器设置为场景的起始点。