TabBarController

1.两种方式创建系统TabBarController

-(id)init{
    self = [super init];
    if( self )
    { //newTask
        HSNewTaskViewController *newsTaskVc = [[HSNewTaskViewController alloc] init];
        [self addChildViewController:newsTaskVc title:@"新任务" normalImage:@"tabbar_NewTask_normal" selectImage:@"tabbar_NewTask_select"];
        //actioning
        HSProcessingViewController *actioningVc = [[HSProcessingViewController alloc] init];
        [self addChildViewController:actioningVc title:@"进行中" normalImage:@"tabbar_processing_normal" selectImage:@"tabbar_processing_select"];
        //completed
        HSCompletedViewController *completedVc = [[HSCompletedViewController alloc] init];
        [self addChildViewController:completedVc title:@"已完成" normalImage:@"tabbar_completed_normal" selectImage:@"tabbar_completed_select"];

    }
    return self;
}

/**
 *  添加一个子控制器
 *
 *  @param childVc           子控制器对象
 *  @param title             标题
 *  @param imageName         图标
 *  @param selectedImageName 选中的图标
 */
- (void)addChildViewController:(UIViewController *)childController title:(NSString *)title normalImage:(NSString *)normalImage selectImage:(NSString *)selectImage{

    childController.tabBarItem.title = title;
    [childController.tabBarItem setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:11.0]}
                                                       forState:UIControlStateNormal];
    [childController.tabBarItem setTitleTextAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:11.0],
                                                         NSForegroundColorAttributeName:[UIColor colorWithRed:/255.0 green:/255.0 
　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　       blue:/255.0 alpha:1.0]}
                                                         forState:UIControlStateSelected];

    childController.tabBarItem.image = [[UIImage imageNamed:normalImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    childController.tabBarItem.selectedImage = [[UIImage imageNamed:selectImage] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

    [self addChildViewController:childController];
//第二种添加方式
// self.viewControllers=@[c1,c2,c3,c4];

}