iphone的UITabBarController内存管理

Question

在我的功能- (void)viewDidLoad：

FirstViewController *first = [[FirstViewController alloc]init]; 
    SecondViewController *second = [[SecondViewController alloc]init]; 
    ThirdViewController *third = [[ThirdViewController alloc]init]; 
    ForthViewController *forth = [[ForthViewController alloc]init]; 
    FifthViewController *fifth = [[FifthViewController alloc]init]; 

    first.tabBarItem = [[UITabBarItem alloc]initWithTitle:@"first" image:[UIImage imageNamed:@"FirstTab.png"] tag:0]; 
    second.tabBarItem = [[UITabBarItem alloc]initWithTitle:@"second" image:[UIImage imageNamed:@"SecondTab.png"] tag:1]; 
    third.tabBarItem = [[UITabBarItem alloc]initWithTitle:@"third" image:[UIImage imageNamed:@"ThirdTab.png"] tag:2]; 
    forth.tabBarItem = [[UITabBarItem alloc]initWithTitle:@"forth" image:[UIImage imageNamed:@"ForthTab.png"] tag:3]; 
    fifth.tabBarItem = [[UITabBarItem alloc]initWithTitle:@"fifth" image:[UIImage imageNamed:@"FifthTab.png"] tag:3]; 

UINavigationController *navigationFirst = [[UINavigationController alloc]initWithRootViewController:first]; 
UINavigationController *navigationSecond = [[UINavigationController alloc]initWithRootViewController:second]; 
UINavigationController *navigationThird = [[UINavigationController alloc]initWithRootViewController:third]; 
UINavigationController *navigationForth = [[UINavigationController alloc]initWithRootViewController:forth]; 
UINavigationController *navigationFifth = [[UINavigationController alloc]initWithRootViewController:fifth]; 

// [first release]; 
// [second release]; 
// [third release]; 
// [forth release]; 
// [first release]; 

NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:navigationFirst,navigationSecond,navigationThird,navigationForth,navigationFifth, nil]; 

[navigationFirst release]; 
[navigationSecond release]; 
[navigationThird release]; 
[navigationForth release]; 
[navigationFifth release]; 

self.tabbarController = [[UITabBarController alloc]init]; 
self.tabbarController.view.frame = CGRectMake(0, 0, 320, 480); 
self.tabbarController.viewControllers = array; 
[array release]; 

我打算五个加UINavigationControllers到tabcontroller，如果我不发表意见fellowing代码，它会崩溃：

// [first release]; 
// [second release]; 
// [third release]; 
// [forth release]; 
// [first release]; 

但我想知道有什么问题，我认为添加thees代码是正确的。

Answer 1

你两次发布第一个对象。这就是为什么你的代码崩溃。 替换[第一版]与[第五版]

Answer 2

你应该释放导航控制器到底

UINavigationController *navigationFirst = [[UINavigationController alloc]initWithRootViewController:first]; 
UINavigationController *navigationSecond = [[UINavigationController alloc]initWithRootViewController:second]; 
UINavigationController *navigationThird = [[UINavigationController alloc]initWithRootViewController:third]; 
UINavigationController *navigationForth = [[UINavigationController alloc]initWithRootViewController:forth]; 
UINavigationController *navigationFifth = [[UINavigationController alloc]initWithRootViewController:fifth]; 

    [first release]; 
    [second release]; 
    [third release]; 
    [forth release]; 
    [first release]; 

NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:navigationFirst,navigationSecond,navigationThird,navigationForth,navigationFifth, nil]; 

self.tabbarController = [[UITabBarController alloc]init]; 
self.tabbarController.view.frame = CGRectMake(0, 0, 320, 480); 
self.tabbarController.viewControllers = array; 

[navigationFirst release]; 
[navigationSecond release]; 
[navigationThird release]; 
[navigationForth release]; 
[navigationFifth release]; 

[array release];