Objective c 无法以编程方式设置UITabbarItem的操作

我需要为我的

UITabbar

设置操作，因为当我单击我的选项卡项时，它应该转到另一个viewcontroller中的操作

但它正在重定向到

UITableview

这是我的密码-

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

// create our table view controller that will display our store list    
FirstViewController *firstViewController = [[EzMasterViewController alloc] init];


// create the navigation controller that will hold our store list and detail view controllers and set the store list as the root view controller
UINavigationController *navController = [[UINavigationController alloc] initWithRootViewController:firstViewController];
[navController.tabBarItem setTitle:@"Home"];
[navController.tabBarItem setImage:[UIImage imageNamed:@"53-house.png"]];


SecondViewController *secondViewController = [[SecondViewController alloc] init];


// create the navigation controller that will hold our store list and detail view controllers and set the store list as the root view controller
UINavigationController *navController1 = [[UINavigationController alloc] initWithRootViewController:secondViewController];
[navController1.tabBarItem setTitle:@"Scan"];
[navController1.tabBarItem setImage:[UIImage imageNamed:@"195-barcode.png"]];

ThirdViewController *thirdViewController = [[ThirdViewController alloc] init];


// create the navigation controller that will hold our store list and detail view controllers and set the store list as the root view controller
UINavigationController *navController2 = [[UINavigationController alloc] initWithRootViewController:thirdViewController];
[navController2.tabBarItem setTitle:@"Map"];
[navController2.tabBarItem setImage:[UIImage imageNamed:@"07-map-marker.png"]];

// add our view controllers to an array, which will retain them
NSArray *viewControllers = [NSArray arrayWithObjects:navController, navController1,navController2, nil];

// add our array of controllers to the tab bar controller
UITabBarController *tabBarController = [[UITabBarController alloc] init];
[tabBarController setViewControllers:viewControllers];

// set the tab bar controller as our root view controller    
[self.window setRootViewController:tabBarController];

// Override point for customization after application launch.
[self.window makeKeyAndVisible];
return YES;

}

通过单击

SecondViewController

tabbaritem，它应该重定向到操作，

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其中动作在<代码> FrestVIEW控制器 .< /P> < P>您应该考虑实现以下两种方法：

– tabBarController:shouldSelectViewController:
– tabBarController:didSelectViewController:

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嗨，你能给我一个完整的细节吗？在FirstViewController中，我有一个按钮操作，我想在appdelegate中调用它，