ios - 将rootViewController转换到UINavigationController之后，“无法识别的选择器发送到实例”

Question

不太确定如何调试它。

2013-01-24 20:36:18.448 SlideMenu [2069:c07] ***由于未捕获的异常'NSInvalidArgumentException'终止了应用程序，原因:'-[[initViewController viewControllers]:无法识别的选择器发送到实例0xac6cdb0'

这是initViewController.m

#import "initViewController.h"
#import "ECSlidingViewController.h"
#import "MenuViewController.h"

@interface initViewController ()

@end

@implementation initViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.topViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Main"];
}

@end

在抛出异常的地方:

AppDelegate.m

#import "AppDelegate.h"
#import "MainViewController.h"
#import "ListDoc.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    ListDoc *list1 = [[ListDoc alloc] initWithTitle:@"Potato Bug" thumbImage:[UIImage imageNamed:@"potatoBugThumb.jpg"]];
    ListDoc *list2 = [[ListDoc alloc] initWithTitle:@"House Centipede" thumbImage:[UIImage imageNamed:@"centipedeThumb.jpg"]];
    NSMutableArray *lists = [NSMutableArray arrayWithObjects:list1,list2,nil];

    UINavigationController * navController = (UINavigationController *) self.window.rootViewController;
    MainViewController * mainController = [navController.viewControllers objectAtIndex:0];
    mainController.someData = lists;
    // Override point for customization after application launch.
    return YES;
}

@end

Answer 1

从您的帖子:

2013-01-24 20:36:18.448 SlideMenu [2069:c07] *由于以下原因终止了应用
未捕获的异常“NSInvalidArgumentException”，原因:
'-[initViewController viewControllers]:无法识别的选择器发送到
实例0xac6cdb0'

找到引发异常的位置:

UINavigationController * navController = (UINavigationController *) self.window.rootViewController;  
MainViewController * mainController = [navController.viewControllers objectAtIndex:0];

这是我的阅读:
项 navController是 initViewController的一个实例，可能不是您所期望的。 initViewController可能不是UINavigationController的子类。

如何调试？尝试这个 : NSLog(@"%@", [navController class]);