#import "AppDelegate.h"#import "Tab1ViewController.h"#import "Tab2ViewController.h"#import "Tab3ViewController.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {            self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen]bounds]];        UITabBarController *tabBarController = [[UITabBarController alloc] init];    self.window.rootViewController = tabBarController;            Tab1ViewController *tab1 = [[Tab1ViewController alloc]init];    Tab2ViewController *tab2 = [[Tab2ViewController alloc]init];    Tab3ViewController *tab3 = [[Tab3ViewController alloc]init];        UINavigationController *nav1 = [[UINavigationController alloc]initWithRootViewController:tab1];    UINavigationController *nav2 = [[UINavigationController alloc]initWithRootViewController:tab2];    UINavigationController *nav3 = [[UINavigationController alloc]initWithRootViewController:tab3];        nav1.title = @"Title1";    nav2.title = @"Title2";    nav3.title = @"Title3";        nav1.tabBarItem.image = [UIImage imageNamed:@"btn_1_h"];    nav2.tabBarItem.image = [UIImage imageNamed:@"btn_2_h"];    nav3.tabBarItem.image = [UIImage imageNamed:@"btn_3_h"];            NSArray *controllers = [NSArray arrayWithObjects: nav1, nav2, nav3, nil];        tabBarController.viewControllers = controllers;        self.window.backgroundColor = [UIColor whiteColor];    [self.window makeKeyAndVisible];        return YES;}