Iphone 按按钮访问Tabbar控制器

我已经通过编程创建了一个带有视图等的TabBarController。现在我想在按下按钮时显示这个TabBarController。我该怎么做？目前，我正在以模式呈现它，但它不工作-抛出sigtrap错误

这是我的TabBarController代码

@implementation TabBarViewController

- (void) loadView
{
    HomeViewController * homeViewController = [[HomeViewController alloc]initWithNibName:@"HomeViewController" bundle:nil];

    UITabBarController *tabBarController = [[UITabBarController alloc] init];
tabBarController.view.frame = CGRectMake(0, 0, 320, 460);

   // Set each tab to show an appropriate view controller
   [tabBarController setViewControllers:[NSArray arrayWithObjects:homeViewController, homeViewController, nil]];
   [self.view addSubview:tabBarController.view];
   [homeViewController release];
   [tabBarController release];
}

这是我从mainViewController中的按钮按下事件访问此tabBarController的代码-

 - (IBAction)quickBrowse:(UIButton *)sender
{
    TabBarViewController * tabBarController = [[TabBarViewController alloc]init];
    [self presentModalViewController:tabBarController animated:YES];
    [tabBarController release];
}

---

只有在不使用IB并且希望手动创建视图的情况下，才应重写方法loadView。当您这样做时，必须将根视图分配给UIViewController的视图属性

我相信在您的情况下，您不需要重写此方法，您可以使用viewDidLoad方法创建UITabBarController并将其存储在变量中，因此当调用事件时，您只需将变量传递给方法presentModalViewController:animated:

您的最终代码如下所示：

- (void) viewDidLoad
{
    [super viewDidLoad];

    HomeViewController * homeViewController = [[HomeViewController alloc]initWithNibName:@"HomeViewController" bundle:nil];

    // you can't pass the same view controller to more than one position in UITabBarController
    HomeViewController * homeViewController2 = [[HomeViewController alloc]initWithNibName:@"HomeViewController" bundle:nil];

    // local variable
    self.modalTabBarController = [[UITabBarController alloc] init];

   // Set each tab to show an appropriate view controller
   [self.modalTabBarController setViewControllers:[NSArray arrayWithObjects:homeViewController, homeViewController2, nil]];
}

- (void)viewDidUnload
{
    self.modalTabBarController = nil;
    [super viewDidUnload];
}

 - (IBAction)quickBrowse:(UIButton *)sender
{
    [self presentModalViewController:self.modalTabBarController animated:YES];
}