UITabBarController中的UI问题

Question

这是源代码

1. 问题：TabbarController无法正常工作...... 请帮帮我

   NSArray *actionButtonItems = @[searchItem, refreshItem];
   
   self.navigationItem.rightBarButtonItems = actionButtonItems;
   
   
   
   NSMutableArray *items = [[NSMutableArray alloc] init];
   
   
   [items addObject:[[UITabBarItem alloc]
                      initWithTabBarSystemItem:UITabBarSystemItemHistory tag:1]];
   
   [items addObject:[[UITabBarItem
                      alloc]initWithTabBarSystemItem:UITabBarSystemItemContacts  tag:2]];
   
   tabBar.items = items;
   
   tabBar.delegate = self;
   
   addFriends = [[AddFriendsViewController alloc]          initWithNibName:@"AddFriendsViewController" bundle:nil];
   
   [self.tabView addSubview:addFriends.view];
   
   //[self.tabsetSelectedIndex = 0];
   
   _tabBarController.selectedIndex = 0;
   
   [self.view addSubview:_tabBarController.view];
   

Answer 1

致电之前

[self.tabView addSubview:addFriends.view];

你应该致电

[self.tabView setViewControllers:[NSArray arrayWithObjects: addFriends, nil]];

Answer 2

设置UITabBarController的selectedViewController属性：

  self.myTabBarController.selectedViewController = myViewController;

使用如下

  self.myTabBarController.selectedViewController 
     = [self.myTabBarController.viewControllers objectAtIndex:0];