UITabBarController 在切换标签时变黑

Question

我在 UINavigationController 中嵌入了 UITabBarController。 UITabBarController 包含 3 个不同的选项卡，这导致 3 个不同的 UIViewControllers 显示 UITableView。我通过故事板实现了所有这些。在第一个 UIViewController 中，我以编程方式为正在运行的 UITableView 实现了 UISearchController。 当我搜索特定单元格然后切换标签时，视图变黑。 我认为这个问题与 SearchController 有一定关系，因为在包含 SearchController 之前，我没有遇到任何问题。

我在这里解决了其他几个问题，但是 none 可以解决我的问题。

已编辑：

下面是我的与 SearchController 相关的代码。

@interface

@property (nonatomic, strong) UISearchController *searchController;
@property BOOL searchControllerWasActive;
@property BOOL searchControllerSearchFieldWasFirstResponder;

@实现

viewDidAppear()

self.searchController = [[UISearchController alloc]initWithSearchResultsController:nil];
self.searchController.searchResultsUpdater = self;
[self.searchController.searchBar sizeToFit];
self.tblContactsTable.tableHeaderView = self.searchController.searchBar;

self.searchController.delegate = self;
self.searchController.dimsBackgroundDuringPresentation = NO;
self.searchController.searchBar.delegate = self;

self.definesPresentationContext = YES;

- (void)updateSearchResultsForSearchController:(UISearchController *)searchController

//reloads table view according to what is searched.

-(void)searchBarCancelButtonClicked:(UISearchBar *)searchBar

self.searchController.searchBar.showsCancelButton = NO;

Answer 1

使用此示例代码，它一定会对您有所帮助 chatlist、contactlist 和 findfriends 是 3 UIViewControllers

- (void)viewDidLoad
    {
        [super viewDidLoad];
        // Do any additional setup after loading the view.
    //    self.navigationItem.hidesBackButton=YES;

        self.navigationController.navigationBar.backgroundColor = [UIColor blueColor];

        _chatlist = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ChatListVC"];
        _contactlist = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ContactListVc"];
        _findfriends = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"FindfriendsVC"];

        self.tabbarcontroller = [[UITabBarController alloc]init];

        self.viewControllers = [NSArray arrayWithObjects:_chatlist,_contactlist,_findfriends, nil];


        self.tabBar.frame =CGRectMake(0,44,self.view.frame.size.width,50);

        UITabBarItem *item0 = [self.tabBar.items objectAtIndex:0];
        UITabBarItem *item1 = [self.tabBar.items objectAtIndex:1];
        UITabBarItem *item2 = [self.tabBar.items objectAtIndex:2];

        item0.title = @"Chat List";
        item1.title = @"Contacts";
        item2.title = @"Find Friends";

        [item0 setFinishedSelectedImage:[UIImage imageNamed:@"chatlist.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"chatlist.png"]];
        [item1 setFinishedSelectedImage:[UIImage imageNamed:@"contacts.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"contacts.png"]];
        [item2 setFinishedSelectedImage:[UIImage imageNamed:@"findfriends.png"] withFinishedUnselectedImage:[UIImage imageNamed:@"findfriends.png"]];


    }

Answer 2

UITabBarController 应该是 storyboard/code 中 window 上最顶层的元素，您可以将导航控制器和视图控制器添加到 UITabBarController 视图控制器。 https://developer.apple.com/library/prerelease/ios/documentation/UIKit/Reference/UITabBarController_Class/index.html

Answer 3

我自己想出了答案。我不知道这样做是否完全正确，但现在应用程序似乎可以正常工作了。

我将我的 UITabBarController 作为初始视图并为每个选项卡单独设置 UINavigationControllers。

UITabBarController 在切换标签时变黑

UITabBarController turns Black while switching tabs

objective-c

uitabbarcontroller

uinavigationcontroller

ios

uisearchcontroller