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//

//  AppDelegate.m

//  UI-NO-10

//

//  Created by Bruce on 15/7/28.

//  Copyright (c) 2015年 Bruce. All rights reserved.

//

#import "AppDelegate.h"

#import "ViewController.h"

#import "NewsViewController.h"

#import "UserInfoViewController.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

//    导航栏  UINavigationController

//    菜单栏  UITabBarController  提供选择进入哪一个页面

//    通过一个数组  里面存储的  是 视图控制器

//    UITabBarController 也是一个UIViewController

    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

    ViewController *group = [[ViewController alloc]init];

    NewsViewController *news = [[NewsViewController alloc]init];

    UserInfoViewController *userInfo = [[UserInfoViewController alloc]init];

//    菜单栏

    UITabBarController *tabBarController = [[UITabBarController alloc]init];

//    通过改变tabBarController的轨道的颜色  来改变  按钮的颜色

    tabBarController.view.tintColor = [UIColor whiteColor];

    tabBarController.viewControllers = @[group,news,userInfo];

//    图片标题的数组

    NSArray *titles = @[@"圈子",@"新闻",@"个人中心"];

    for (int i=0; i<titles.count; i++) {

        //    找到UITabBarController里面的  菜单栏视图 再找到  里面的 tabBarItem 的数组  数组里面存的是 视图控制器的数组  对应的按钮

        UITabBarItem *groupItem = tabBarController.tabBar.items[i];

        //    设置TabBarItem的标题

        groupItem.title = titles[i];

        //    设置TabBarItem的图片

        groupItem.image = [UIImage imageNamed:titles[i]];

    }

//  默认选项

    tabBarController.selectedIndex = 1;

    self.window.rootViewController = tabBarController;

    [self.window makeKeyAndVisible];

    return YES;

}

- (void)applicationWillResignActive:(UIApplication *)application {

    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.

    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.

}

- (void)applicationDidEnterBackground:(UIApplication *)application {

    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.

    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

}

- (void)applicationWillEnterForeground:(UIApplication *)application {

    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.

}

- (void)applicationDidBecomeActive:(UIApplication *)application {

    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.

}

- (void)applicationWillTerminate:(UIApplication *)application {

    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

}

@end

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原文地址：http://www.cnblogs.com/wukun16/p/4883977.html