Foundation 心得、笔记

QYFirstViewController *firstVC = [[QYFirstViewControlleralloc]init];

    

    ViewController *rootVC = [[ViewControlleralloc]init];

    

    UINavigationController *nav = [[UINavigationControlleralloc]initWithRootViewController:firstVC];

-(instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    if (self = [superinitWithNibName:nibNameOrNilbundle:nibBundleOrNil]) {

        

        //创建一个tabBarItem

        UITabBarItem *tabBarItem = [[UITabBarItemalloc]initWithTabBarSystemItem:UITabBarSystemItemTopRatedtag:1];

        //把tabBarItem设置成当前视图控制器在tabBarController里显示的tab

        self.tabBarItem = tabBarItem;

        //设置徽章

//        self.tabBarItem.badgeValue = @"10";

    }

    return self;

}