我有一个像下面这样的导航。
--initial-->导航控制器--root-->firstViewController--push-->secondViewController--modal-->导航控制器--root-->thirdViewController。
我正试图从thirdViewController 放松到SecondViewController。然后在某些情况下在 unwind 函数中弹出 To FirstViewController。
@IBAction func unwind (segue:UIStoryboardSegue){
self.navigationController?.popViewControllerAnimated(false)
}
但它已经崩溃了。
我可以通过在运行时找到导航控制器来解决问题，但这不是动态解决方案。我试图理解展开逻辑。
我错过了放松赛格或其他什么吗？
2015-09-15 11:01:42.439 Test[65578:1323530] *** Assertion failure in -[UINavigationController popToViewController:transition:], /SourceCache/UIKit_Sim/UIKit-3347.44.2/UINavigationController.m:5652
2015-09-15 11:01:42.443 Test[65578:1323530] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Failed to get popped view controller.'
*** First throw call stack:
(
0 CoreFoundation 0x0000000101daec65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000103919bb7 objc_exception_throw + 45
2 CoreFoundation 0x0000000101daeaca +[NSException raise:format:arguments:] + 106
3 Foundation 0x000000010224b98f -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195
4 UIKit 0x00000001027b3951 __57-[UINavigationController popToViewController:transition:]_block_invoke + 924
5 UIKit 0x0000000102789188 +[UIViewController _performWithoutDeferringTransitions:] + 101
6 UIKit 0x00000001027b3511 -[UINavigationController popToViewController:transition:] + 616
7 UIKit 0x00000001027aa82b __90-[UINavigationController segueForUnwindingToViewController:fromViewController:identifier:]_block_invoke + 102
8 UIKit 0x000000010264ed62 -[UIApplication sendAction:to:from:forEvent:] + 75
9 UIKit 0x000000010264ed62 -[UIApplication sendAction:to:from:forEvent:] + 75
10 UIKit 0x000000010276050a -[UIControl _sendActionsForEvents:withEvent:] + 467
11 UIKit 0x000000010275f8d9 -[UIControl touchesEnded:withEvent:] + 522
12 UIKit 0x000000010269b958 -[UIWindow _sendTouchesForEvent:] + 735
13 UIKit 0x000000010269c282 -[UIWindow sendEvent:] + 682
14 UIKit 0x0000000102662541 -[UIApplication sendEvent:] + 246
15 UIKit 0x000000010266fcdc _UIApplicationHandleEventFromQueueEvent + 18265
16 UIKit 0x000000010264a59c _UIApplicationHandleEventQueue + 2066
17 CoreFoundation 0x0000000101ce2431 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
18 CoreFoundation 0x0000000101cd82fd __CFRunLoopDoSources0 + 269
19 CoreFoundation 0x0000000101cd7934 __CFRunLoopRun + 868
20 CoreFoundation 0x0000000101cd7366 CFRunLoopRunSpecific + 470
21 GraphicsServices 0x0000000105d82a3e GSEventRunModal + 161
22 UIKit 0x000000010264d8c0 UIApplicationMain + 1282
23 Test 0x0000000101bc7487 main + 135
24 libdyld.dylib 0x000000010404f145 start + 1
)