Question

我在2个独立的viewcontrollers中有2个集合视图，它们位于tabbar中。我正在尝试隐藏tabbar项目2，直到加载tabbar 1。我们有什么方法可以隐藏某个标签栏项吗？最初在viewWillAppear中我想隐藏tabBar Item ..这是我的代码：

隐藏标签栏2

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    //HIDE TABBAR2
}

显示标签栏2

- (void)loadCollectionView
{
    [self.collectionView reloadData];
    [self.collectionView performBatchUpdates:^{}
                                  completion:^(BOOL finished) {
                                      //Unhide TabBar
                                  }];

}

Answer 1

对UITabBarController进行子类化（称之为MainTabController）。在界面构建器中，将选项卡栏控制器对象的类类型设置为MainTabController类型。

在MainTabController中创建一个强大的属性来存储第二个视图控制器（将隐藏的那个）：

@property (nonatomic, strong) UIViewController *secondTabVC;

然后在viewDidLoad：

// Store the second tab's VC for later
self.secondTabVC = self.viewControllers[1];

// Hide the second tab's VC
self.viewControllers = @[self.viewControllers[0]];

加载数据后：

// Show the second tab's VC
self.viewControllers = @[self.viewControllers[0], self.secondTabVC];

Answer 2

您需要从tabbar删除该视图控制器，您无法隐藏特定的标签栏项目！所以你可以管理它，

NSMutableArray *viewControllersArr = [self.tabBarController.viewControllers mutableCopy];

[viewControllersArr removeObjectAtIndex:1];

[self.tabBarController setViewControllers:viewControllersArr animated:YES];

当您收到集合视图数据或想要显示第二个标签时，您可以这样做

NSMutableArray *viewControllersArr = [self.tabBarController.viewControllers mutableCopy];

UIViewController *yourSeconVc = [self.storyboard instantiateViewControllerWithIdentifier:@"yourStoryboardIdentifier"]; // or whatever way your view controller is for second tab

[viewControllersArr addObject:yourSeconVc];

[self.tabBarController setViewControllers:viewControllersArr animated:YES];

Answer 3

试试此代码

- (void)viewWillAppear:(BOOL)animated
{
   [super viewWillAppear:animated];
   [_tabController setViewControllers:@[viewcontroller1,viewcontroller3]];

}

在此处显示标签2

- (void)loadCollectionView
{
 [self.collectionView reloadData];
[self.collectionView performBatchUpdates:^{}

completion:^(BOOL finished)
 {
    [_tabController setViewControllers:@[viewcontroller1,viewcontroller2,viewcontroller3]];
                              }];
  }

在collectionView重新加载Objective C之后隐藏TabBar Item＃2

3 个答案: