UINavigation Bar和uitabar以编程方式-所有对象都被禁用?

这都是在AppDelegate中完成的:

//Initialize the controllers

 navController = [[UINavigationController alloc]init];
 iVacationTabBar = [[UITabBarController alloc] init];


//Define the viewcontrollers

 myTools* vc_tools = [[myTools alloc] init];
 mySettings* vc_settings = [[mySettings alloc] init];
 aboutIVacation* vc_about = [[aboutIVacation alloc] init];
 myCurrent *mycurrentpage = [[myCurrent alloc] init];
//Create the array of controllers

 NSArray* controllers = [NSArray arrayWithObjects:mycurrentpage,  vc_tools,vc_settings, vc_about, nil];

//Add the view controllers to the tab bars:

 [iVacationTabBar setViewControllers: controllers animated:YES];

//Push the first view controller to the stack:

 [navController pushViewController: mycurrentpage animated:NO];

//Add the tabBar and navController to the window:

 [window addSubview:iVacationTabBar.view];
 [window addSubview:navController.view];

我做错什么了。我无法让页面上的任何元素工作。我的当前页面上有一个按钮也不起作用。