在UINavigational Controller上寻找代码以避免'NSInvalidArgumentException'

Question

以下是在UINavigationalController上请求代码的错误

2013-11-02 09:30:33.727 NavigationalCntrlApp[465:70b] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Pushing a navigation controller is not supported'
    *** First throw call stack:
    (
        0   CoreFoundation                      0x0173a5e4 __exceptionPreprocess + 180
        1   libobjc.A.dylib                     0x014bd8b6 objc_exception_throw + 44
        2   UIKit                               0x003676bd __71-[UINavigationController pushViewController:transition:forceImmediate:]_block_invoke + 0
        3   UIKit                               0x003670b5 -[UINavigationController pushViewController:animated:] + 325
        4   UIKit                               0x003557d7 -[UINavigationController initWithRootViewController:] + 122
        5   NavigationalCntrlApp                0x00002c91 -[AppDelegate application:didFinishLaunchingWithOptions:] + 673
        6   UIKit                               0x00225355 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 309
        7   UIKit                               0x00225b95 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1536
        8   UIKit                               0x0022a3a8 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 824
        9   UIKit                               0x0023e87c -[UIApplication handleEvent:withNewEvent:] + 3447
        10  UIKit                               0x0023ede9 -[UIApplication sendEvent:] + 85
        11  UIKit                               0x0022c025 _UIApplicationHandleEvent + 736
        12  GraphicsServices                    0x036e12f6 _PurpleEventCallback + 776
        13  GraphicsServices                    0x036e0e01 PurpleEventCallback + 46
        14  CoreFoundation                      0x016b5d65 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
        15  CoreFoundation                      0x016b5a9b __CFRunLoopDoSource1 + 523
        16  CoreFoundation                      0x016e077c __CFRunLoopRun + 2156
        17  CoreFoundation                      0x016dfac3 CFRunLoopRunSpecific + 467
        18  CoreFoundation                      0x016df8db CFRunLoopRunInMode + 123
        19  UIKit                               0x00229add -[UIApplication _run] + 840
        20  UIKit                               0x0022bd3b UIApplicationMain + 1225
        21  NavigationalCntrlApp                0x0000304d main + 141
        22  libdyld.dylib                       0x01d7870d start + 1
        23  ???                                 0x00000001 0x0 + 1
    )
    libc++abi.dylib: terminating with uncaught exception of type NSException
    (lldb) 

任何人都可以帮助我为什么会出现这个错误，在Xcode 4.3中使用相同的代码，但它在Xcode 5中引发了错误。

Answer 1

看起来您尝试将navigationController设置为navigationController的rootviewcontroller。这是不允许的

如果我是对的，你就是这样做的：

// 1. Make new UIViewController
UIViewController *vc = [[UIViewController alloc] init];
// 2. Make UINavigationController
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
// 3. Set navigationController as rootViewController of a new navigationController
UINavigationController *nav2 = [[UINavigationController alloc] initWithRootViewController:nav];

虽然你应该这样做：

// 1. Make New UIViewController
UIViewController *vc = [[UIViewController alloc] init];
// 2. Set it as rootviewcontroller of a new navigationController
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
[self.navigationController pushViewController:nav];

如果我的问题出错，请在您的问题中发布一些额外的代码。