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澄清：下面描述的带有单例的视图控制器本身可以正常工作。但是，当嵌入到 UITabBarController 中时，它不起作用。

原标题：NSUnknownKeyException：可能不是笔尖，会不会是单例？

这是另一个“NSUnknownKeyException...此类不符合键的键值编码”问题，这些问题在这里很丰富。我经历了很多！这是完整的投诉：

NSUnknownKeyException', reason: '[<UIProxyObject 0x683dfe0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key button1.'

似乎这些例外总是归结为笔尖遗留的变量问题，这些变量在其他地方已更改并且没有被清除。所以我已经完成了我所有的笔尖，断开连接，重新连接，检查无济于事。然后我删除了笔尖并从零开始重建它，我仍然遇到同样的问题:-(所以我再次转向 SO 的蜂巢思维。

通过一系列NSLogs 和其他技巧，我知道问题出在 GameViewController 上（如果我摆脱它并用空控制器替换它，应用程序可以正常工作）。下面是 GameViewController 的相关部分：

@interface GameViewController : UIViewController <UIAlertViewDelegate>
@end

@implementation GameViewController

- (id) init {
    NSLog(@" GVC initializing");      
    self = [super initWithNibName:@"GameViewController"
                           bundle:nil];
    if (self) {
        UITabBarItem *tbi = [self tabBarItem];
        [tbi setTitle:@"Play Game"];
    }       
    return self;
}

- (id) initWithNibName:(NSString *)nibName bundle:(NSBundle *)Bundle {
    return [self init];
}

 - (void)loadView {
     [super loadView];
     NSLog(@"loadView is starting");

     // Set up display of button and label singletons

     NSMutableArray *keyArray;
     NSMutableArray *valueArray;
     keyArray = [NSMutableArray arrayWithObjects:@"answerButtons", @"clueLabels", @"keyPad", nil];
     valueArray = [NSMutableArray arrayWithObjects: [AnswerButtons answerButtons], [ClueLabels clueLabels], [KeyPad keyPad], nil];

     NSMutableDictionary *externals = [NSMutableDictionary dictionaryWithObjects:valueArray
                                                                         forKeys:keyArray];

     // Fire the button and label singletons

     [[AnswerButtons answerButtons] answerButtonsDidLoad];
     [[ClueLabels clueLabels] clueLabelsDidLoad];
     [[KeyPad keyPad] keyPadDidLoad];

     // Set up nibOptions and link to externals

     NSDictionary *nibOptions = [NSDictionary dictionaryWithObject:externals
                                                            forKey:UINibExternalObjects];

     [self.nibBundle loadNibNamed:self.nibName owner:self options:nibOptions];

     NSLog(@"loadView is done");
 }

@end

这是我的应用程序委托的相关部分：

@implementation AppDelegate   
@synthesize window = _window;   
@synthesize tbc = _tbc;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSLog(@"dFLWO starting");

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    UITabBarController *tbc = [[UITabBarController alloc] init];

    SettingsViewController *settingsVC = [[SettingsViewController alloc] init];
    GameViewController *gameVC = [[GameViewController alloc] init];
//    UIViewController *temp = [[UIViewController alloc] init]; // works fine

    NSLog(@"dFLWO: both VC's inited");

    [tbc setViewControllers:[NSArray arrayWithObjects:gameVC, settingsVC, nil]];
    //    [tbc setViewControllers:[NSArray arrayWithObjects: temp, settingsVC, nil]]; // works fine

    NSLog(@"dFLWO: VC's set");

    [[self window] setRootViewController:tbc];
    [self.window makeKeyAndVisible];
    NSLog(@"TabBarController now active");

    return YES;
}

对不起。那很长。我已经尽可能地解决了这是一个笔尖问题。也许这是我需要启动的那些单身人士的问题？该项目的先前版本没有标签栏控制器，其中这些单例（以及其他未显示的）工作得很好。

建议赞赏！

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