每一个控制器，都有tabBaItemr和navigationItem 属性

每一个控制器，都有tabBaItemr和navigationItem 属性

 UITabBarController *tabbarVc = [[UITabBarController alloc] init];tabbarVc.viewControllers = @[vc1, vc2, vc3];

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"取消" style:UIBarButtonItemStyleDone target:self action:@selector(cancel)];