swift - popToViewController 无法弹出查看错误

Question

我正在使用以下代码:

 @IBAction func popToRoot(sender:UIBarButtonItem){

    navigationController.popToViewController(foodforteethViewController(), animated: false)

}

此函数与自定义后退按钮链接，h 文件链接在 Objective-C/swift 桥接文件中。问题是我收到如下错误:

2014-07-19 23:35:40.842 FoodForTeeth[9040:238499] * Assertion failure in -[UINavigationController popToViewController:transition:], /SourceCache/UIKit_Sim/UIKit-3232.3/UINavigationController.m:5345 2014-07-19 23:35:40.845 FoodForTeeth[9040:238499] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Failed to get popped view controller.' * First throw call stack: ( 0 CoreFoundation 0x00000001023ec995 exceptionPreprocess + 165 1 libobjc.A.dylib 0x000000010209b9a3 objc_exception_throw + 45 2 CoreFoundation 0x00000001023ec7fa +[NSException raise:format:arguments:] + 106 3 Foundation 0x0000000101cc637f -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 195 4 UIKit 0x0000000100b456b6 -[UINavigationController popToViewController:transition:] + 762 5 FoodForTeeth 0x00000001000272fe _TFC12FoodForTeeth9dietDiary9popToRootfS0_FCSo15UIBarButtonItemT_ + 302 6 FoodForTeeth 0x00000001000274f2 _TToFC12FoodForTeeth9dietDiary9popToRootfS0_FCSo15UIBarButtonItemT_ + 66 7 UIKit 0x00000001009f76b6 -[UIApplication sendAction:to:from:forEvent:] + 75 8 UIKit 0x00000001009f76b6 -[UIApplication sendAction:to:from:forEvent:] + 75 9 UIKit 0x0000000100af91c0 -[UIControl _sendActionsForEvents:withEvent:] + 467 10 UIKit 0x0000000100af858f -[UIControl touchesEnded:withEvent:] + 522 11 UIKit 0x0000000100a3c3b8 -[UIWindow _sendTouchesForEvent:] + 735 12 UIKit 0x0000000100a3cce3 -[UIWindow sendEvent:] + 683 13 UIKit 0x0000000100a0a1a1 -[UIApplication sendEvent:] + 246 14 UIKit 0x0000000100a1707a _UIApplicationHandleEventFromQueueEvent + 17591 15 UIKit 0x00000001009f3269 _UIApplicationHandleEventQueue + 1967 16 CoreFoundation 0x0000000102322a31 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17 17 CoreFoundation 0x000000010231826d __CFRunLoopDoSources0 + 269 18 CoreFoundation 0x00000001023178a4 __CFRunLoopRun + 868 19 CoreFoundation 0x00000001023172d6 CFRunLoopRunSpecific + 470 20 GraphicsServices 0x0000000105475bbc GSEventRunModal + 161 21 UIKit 0x00000001009f6288 UIApplicationMain + 1282 22 FoodForTeeth 0x0000000100054db3 main + 115 23 libdyld.dylib 0x0000000102b45145 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb)

出了什么问题？

Answer 1

您无法弹出不在 NavigationController 堆栈中的 View Controller 。您应该像这样弹出

如果你想弹出到rootViewController而不是直接使用这个方法

 @IBAction func popToRoot(sender:UIBarButtonItem){


        self.navigationController.popToRootViewControllerAnimated(false)
}