Question

虽然我的应用程序正常启动并且没有错误，但当我尝试单击按钮以显示另一个视图时，应用程序将关闭。
在调试器控制台上，这是显示：

"SEM2REDO[13487:b603] Application tried to push a nil view controller on target <UINavigationController: 0x4ea5be0>"

然后第二次单击它，会出现，然后应用程序取消。

2012-01-24 11:46:37.549 SEM2REDO[13591:b603] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Could not load NIB in bundle: 'NSBundle </Users/margueriteoquinn/Library/Application Support/iPhone Simulator/4.3/Applications/F2B86CC5-C700-414E-9030-17E94535EB1A/SEM2REDO.app> (loaded)' with name 'SelectView''
*** Call stack at first throw:
(
    0   CoreFoundation                      0x00dc95a9 __exceptionPreprocess + 185
    1   libobjc.A.dylib                     0x00f1d313 objc_exception_throw + 44
    2   CoreFoundation                      0x00d81ef8 +[NSException raise:format:arguments:] + 136
    3   CoreFoundation                      0x00d81e6a +[NSException raise:format:] + 58
    4   UIKit                               0x004b40fa -[UINib instantiateWithOwner:options:] + 2024
    5   UIKit                               0x004b5ab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
    6   UIKit                               0x0036b628 -[UIViewController _loadViewFromNibNamed:bundle:] + 70
    7   UIKit                               0x00369134 -[UIViewController loadView] + 120
    8   UIKit                               0x0036900e -[UIViewController view] + 56
    9   UIKit                               0x00367482 -[UIViewController contentScrollView] + 42
    10  UIKit                               0x00377f25 -[UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController:] + 48
    11  UIKit                               0x00376555 -[UINavigationController _layoutViewController:] + 43
    12  UIKit                               0x00377870 -[UINavigationController _startTransition:fromViewController:toViewController:] + 524
    13  UIKit                               0x0037232a -[UINavigationController _startDeferredTransitionIfNeeded] + 266
    14  UIKit                               0x00379562 -[UINavigationController pushViewController:transition:forceImmediate:] + 932
    15  UIKit                               0x003721c4 -[UINavigationController pushViewController:animated:] + 62
    16  SEM2REDO                            0x00002590 -[SEM2REDOViewController chooseFirstMeeting:] + 252
    17  UIKit                               0x002b94fd -[UIApplication sendAction:to:from:forEvent:] + 119
    18  UIKit                               0x00349799 -[UIControl sendAction:to:forEvent:] + 67
    19  UIKit                               0x0034bc2b -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 527
    20  UIKit                               0x0034a7d8 -[UIControl touchesEnded:withEvent:] + 458
    21  UIKit                               0x002ddded -[UIWindow _sendTouchesForEvent:] + 567
    22  UIKit                               0x002bec37 -[UIApplication sendEvent:] + 447
    23  UIKit                               0x002c3f2e _UIApplicationHandleEvent + 7576
    24  GraphicsServices                    0x01721992 PurpleEventCallback + 1550
    25  CoreFoundation                      0x00daa944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
    26  CoreFoundation                      0x00d0acf7 __CFRunLoopDoSource1 + 215
    27  CoreFoundation                      0x00d07f83 __CFRunLoopRun + 979
    28  CoreFoundation                      0x00d07840 CFRunLoopRunSpecific + 208
    29  CoreFoundation                      0x00d07761 CFRunLoopRunInMode + 97
    30  GraphicsServices                    0x017201c4 GSEventRunModal + 217
    31  GraphicsServices                    0x01720289 GSEventRun + 115
    32  UIKit                               0x002c7c93 UIApplicationMain + 1160
    33  SEM2REDO                            0x00001a70 main + 102
    34  SEM2REDO                            0x00001a01 start + 53
)
terminate called throwing an exception

我不知道这意味着什么，但我真的需要一些帮助。这是我实施的一些有用的委托方法

@synthesize window;
@synthesize navController;


#pragma mark -
#pragma mark Application lifecycle

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    [self.window makeKeyAndVisible];

    SEM2REDOViewController  *firstController = [[SEM2REDOViewController alloc]
                                            initWithNibName:@"SEM2REDOViewController" bundle:nil];
    UINavigationController  *navigationController = [[UINavigationController alloc]
                                              initWithRootViewController:firstController];

    [self setNavController:navigationController];
    [window addSubview:[navigationController view]];

    [navigationController release];
    [firstController release];  

    return YES;

}

这是我的SEM2REDOViewController中显示第二个视图的方法

- (IBAction)chooseFirstMeeting:(id)sender {     
    SelectRotationController *selectView = [[SelectRotationController alloc] 
                                            initWithNibName:@"SelectView" bundle:[NSBundle mainBundle]];
    [selectView.navigationItem setTitle:@"Select First Meeting"];
    [self.navigationController pushViewController:self.selectRotationController animated:YES];
    self.selectRotationController = selectView; 
    [selectView release];
}

如果这是一个简单的问题，我很抱歉：我是一名高中学生，试图对编程进行独立研究，因此非常感谢任何帮助。

Answer 1

看起来您正在发布导航控制器，然后尝试向其添加视图控制器。

Answer 2

 [self.window makeKeyAndVisible];

SEM2REDOViewController *firstController = [[SEM2REDOViewController alloc] initWithNibName:@"SEM2REDOViewController" bundle:nil]; UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:firstController];

[self setNavController:navigationController];
 [window addSubview:[navigationController view]];

[navigationController release]; [firstController release];

return YES;

将其更改为

SEM2REDOViewController *firstController = [[[SEM2REDOViewController alloc] initWithNibName:@"SEM2REDOViewController" bundle:nil] autorelease];
 self.navigationController = [[[UINavigationController alloc]initWithRootViewController: firstController]autorelease];

 [window addSubview:self.navigationController.view];

 [self.window makeKeyAndVisible];
return YES;

这将解决您的问题..如果您有任何问题，了解某些事情让我知道。

从按钮调用子视图：应用程序关闭

2 个答案: