沒有出現標籤欄

Question

此項目的標籤欄沒有顯示，而只是顯示一個黑色的屏幕。此應用程序委託中的應用程序啓動時，實用地輸入此標籤欄。

main_tab=[[UITabBarController alloc]init]; 
viewcontroller = [[HomeViewController alloc]init]; 
viewcontroller.title =@"Home"; 
UINavigationController *nav =[[UINavigationController alloc]initWithRootViewController:viewcontroller]; 

viewcontroller1 = [[SearchViewController alloc]init]; 
viewcontroller1.title =@"Search"; 
UINavigationController *nav1 =[[UINavigationController alloc]initWithRootViewController:viewcontroller1]; 


tabs_array=[[NSArray alloc]initWithObjects:nav,nav1, nil]; 
main_tab.viewControllers=tabs_array; 
[self.window addSubview:main_tab.view]; 
[self.window makeKeyAndVisible]; 

return YES; 

Answer 1

嘗試更換此行

[self.window addSubview:main_tab.view]; 

有了這個

self.window.rootViewController = main_tab;