iphone - 程序收到信号“EXC_BAD_ACCESS”

Question

当我运行以下代码时，出现上述错误

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{


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

    [self.window makeKeyAndVisible];

    self.viewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    self.firstViewController=[[FirstViewController alloc]initWithNibName:nil bundle:nil];
    UINavigationController *localNavigationController=[[UINavigationController alloc]initWithRootViewController:self.viewController];
    self.navigationController=localNavigationController;
    [localNavigationController release];
    UINavigationController *localFistNavigationController=[[UINavigationController alloc]initWithRootViewController:self.firstViewController];
    self.firstNavigationController=localFistNavigationController;
    [localNavigationController release];
   NSArray *twoBars=[[NSArray alloc]initWithObjects:self.navigationController,self.firstNavigationController, nil];
    UITabBarController *localTAbBarController =[[UITabBarController alloc]init];
    [localTAbBarController setViewControllers:twoBars];
    self.tabBarController=localTAbBarController;
    [localTAbBarController release];
    [self.window addSubview:self.tabBarController.view];

        return YES;
}

如果我运行以下代码，它将运行良好

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

    self.viewController = [[ViewController alloc] initWithNibName:nil bundle:nil];
    self.firstViewController = [[FirstViewController alloc] initWithNibName:nil bundle:nil];

    self.navigationController = [[UINavigationController alloc]
                                 initWithRootViewController:self.viewController];

    self.firstNavigationController=[[UINavigationController alloc]initWithRootViewController:self.firstViewController];
    NSArray *twoBars=[[NSArray alloc]initWithObjects:self.navigationController,self.firstNavigationController, nil];

    self.tabBarController=[[UITabBarController alloc]init];
    [self.tabBarController setViewControllers:twoBars];

       [self.window addSubview:self.tabBarController.view];



    return YES;

我不明白这些有什么区别。在第一个中，我刚刚创建了局部变量并将其分配给属性。在后面的一个中直接使用了属性。
为什么给出错误程序收到的信号“EXC_BAD_ACCESS”

Answer 1

我认为在第一个中，您发布了一些代码，然后在发布后再次发布了该对象，例如:
[localTAbBarController release];这个。也许这就是为什么您收到错误程序

信号“EXC_BAD_ACCESS”。在第二个中，您很好地使用了对象而没有发布，因此它的工作

精细。