系统UITabbarController

新建MainTabbarController类

在MainTabbarController.m中

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    //创建viewContronllers
    [self createViewControllers];
    //创建tabBarItems
    [self createItems];
}

#pragma mark 创建viewControllers

- (void)createViewControllers
{
    UINavigationController * nc1 = [[UINavigationController alloc] initWithRootViewController:[[viewController1 alloc] init]];
    UINavigationController * nc2 = [[UINavigationController alloc] initWithRootViewController:[[viewController2 alloc] init]];
    UINavigationController * nc3 = [[UINavigationController alloc] initWithRootViewController:[[viewController3 alloc] init]];

    self.viewControllers = @[nc1,nc2,nc3];
}

- (void)createItems
{
    NSArray *titleArray = @[@"1", @"2", @"3"];
    NSArray *selectImageName = @[@"selected1.png", @"selected2.png", @"selected3.png"];
    NSArray *unselectImageName = @[@"normal1.png", @"normal2.png", @"normal3.png"];
    for (int i = 0; i < titleArray.count; i++) {
        //需要对图片进行单独处理
        UIImage *selectImage = [UIImage imageNamed:selectImageName[i]];
        selectImage = [selectImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        UIImage *unselectImage = [UIImage imageNamed:unselectImageName[i]];
        unselectImage = [unselectImage imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
        //以上是防止在bar上显示为阴影而不是图片
        UITabBarItem *item = self.tabBar.items[i];
        item.selectedImage = selectImage;
        item.image = unselectImage;
        item.title = titleArray[i];
    }
    [self.tabBar setBackgroundImage:[UIImage imageNamed:@"img_tabBar_bg_iOS8.png"]];
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor orangeColor]} forState:UIControlStateSelected];
    [[UITabBarItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName : [UIColor darkGrayColor]} forState:UIControlStateNormal];
}

特别鸣谢 詹Q同学