问题：的TabBar控制器+导航控制器：编程

Question

好家伙，

我试图与的TabBar控制器和导航控制器的应用程序。 但我得到一些问题...当我尝试popViewController在我的第二个视图，应用程序崩溃。有人知道发生了什么事吗？

我代表：

// -- PranchetaAppDelegate.m 

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

    self.tabBarController = [[UITabBarController alloc] init]; 

    NSMutableArray *localControllersArray = [[NSMutableArray alloc] initWithCapacity:1]; 

    PlayersViewController* playersViewController = [[PlayersViewController alloc] initWithTabBar]; 

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

    [localControllersArray addObject:self.navigationController]; 

    [self.navigationController release]; 

    self.tabBarController.viewControllers = localControllersArray; 
    [self.window addSubview:self.tabBarController.view]; 

    [self.window makeKeyAndVisible]; 

    [self.navigationController release]; 
    [localControllersArray release]; 

    return YES; 

} 

我的第一个观点：

// -- PlayersViewsController.m 

- (id)initWithTabBar { 

    if (self) 
    { 

     self.title = @"Players"; 
     self.tabBarItem.image = [UIImage imageNamed:@"PlayersTabBarIcon.png"]; 

     CustomNavigationBarButton *addButtonView = [[CustomNavigationBarButton alloc] initWithImage:@"AddButton.png" withSelected:@"AddButtonSelected.png"]; 

     [addButtonView addTarget:self action:@selector(gotoCreatePlayers) forControlEvents:UIControlEventTouchUpInside]; 

     UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithCustomView:addButtonView]; 

     self.navigationItem.rightBarButtonItem = addButton; 

     [addButton release]; 
     [addButtonView release]; 

    } 

    return self; 

} 

- (void)gotoCreatePlayers { 

    CreatePlayersViewController *createPlayer = [CreatePlayersViewController new]; 
    [self.navigationController pushViewController:createPlayer animated:YES]; 
    [createPlayer release]; 

} 

当我把我的第二个观点，我尝试去回导航。但应用程序崩溃...

错误任命：

// -- main.m 
int main(int argc, char *argv[]) 
{ 
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init]; 
    int retVal = UIApplicationMain(argc, argv, nil, nil); 
    [pool release]; 
    return retVal; 
} 

谢谢你们！

Answer 1

试试这个：

变化：

CreatePlayersViewController *createPlayer = [CreatePlayersViewController new]; 

到：

CreatePlayersViewController *createPlayer = [CreatePlayersViewController alloc]; 

还，如果有任何的init方法调用比它应该是这样的

CreatePlayersViewController *createPlayer = [[CreatePlayersViewController alloc]init]; 

尝试类似这样的： 此项添加到.h文件：CreatePlayersViewController *createPlayer 然后替换上面这个代码：

if (createPlayer ==nil) { 
    CreatePlayersViewController *nextView = [[CreatePlayersViewController alloc] initWithStyle:UITableViewStylePlain]; 
    self.createPlayer = nextView; 
    [nextView release]; 
} 
self.meetTheTeam.view.hidden = NO; 


[self.navigationController pushViewController:self.meetTheTeam animated:YES];