IOS: 添加 viewcontroller 到 ios 中的自定义 TabBar

Question

我正在做一个聊天项目，我必须在其中使用 UITabBar。我在这个项目中使用故事板，但根据要求，我在项目中添加了自定义 TabBar 以将其安装在视图顶部。现在的问题是自定义 TabBar 在视图顶部显示良好，但是当我单击选项卡时它只显示黑屏而不是显示 ViewControllers。我正在分享我的代码，请给我建议解决方案。

我的.h文件

@interface TabBar : UITabBarController
{

}
@property(strong,nonatomic) UITabBarController *tabbarcontroller;
@property(strong,nonatomic) ChatListVC *chatlist;
@property(strong,nonatomic) ContactListVc *contactlist;
@property(strong,nonatomic) FindfriendsVC *findfriends;

@end

我的 .m 文件

@implementation TabBar

    - (void)viewDidLoad

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

            self.title = @"Chat Home Page";

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

            _chatlist = [ChatListVC new];
            _contactlist = [ContactListVc new];
            _findfriends = [FindfriendsVC new];     //initWithNibName:@"FindfriendsVC" bundle:nil];//[FindfriendsVC new];

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

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

            //self.navigationController.navigationBar.frame.size.height;
            //UITabBar *tabBar = self.tabBarController.tabBar;
            //CGFloat topBarOffset = self.topLayoutGuide.length;
            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"]];

        }

输出的快照是

Answer 1

您的视图控制器似乎没有正确初始化。

如果你的视图控制器都在情节提要中，请尝试替换

_chatlist = [ChatListVC new];
_contactlist = [ContactListVc new];
_findfriends = [FindfriendsVC new];

与：

_chatlist = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ChatListIdentifier"];
_contactlist = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"ContactListIdentifier"];
_findfriends = [[UIStoryboard storyboardWithName:@"Main" bundle:nil] instantiateViewControllerWithIdentifier:@"FindfriendsIdentifier"];

其中标识符字符串是您在 Storyboard 中设置的自己的标识符。

IOS: 添加 viewcontroller 到 ios 中的自定义 TabBar

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