一個標籤欄控制器項目應該隱藏在iPhone應用程序

Question

我正在開發一個應用程序，我正在使用標籤欄控制器。當應用程序打開時，它應該只顯示一個標籤欄條目「餐館」，當我從任何餐館的菜單中選擇一些食品時，則應該顯示另一個標籤欄視圖控制器稱爲項目。請幫助我如何實現這一點。

在此先感謝。

Answer 1

這裏有一個辦法：

1. 創建應用程序，只要你想，並確保當您添加TabBarController，應該只有一個標籤項（刪除其他項目是默認添加時加tabbarcontroller ）

2. 創建UITabBarController

3. 分配類從腳本的所有控制器的新的子類，以及指派特定的故事板標識符

4. 聲明BOOL類型的全球屬性（在用戶違約或要維持）我在AppDelegate.h

5. 從那裏你想添加泰伯（顯示）新標籤

   現在加入，添加代碼，我的代碼是：

   - (IBAction)addNewTab:(id)sender 
   { 
       AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; 
       appDelegate.isAddNew = TRUE; 
       [self.tabBarController viewDidLoad]; 
   } 
   

6. 然後轉到您的自定義tabbarcontroller（在一步創建2 - >的UITabBarController子類），我的班級.h

   #import <UIKit/UIKit.h> 
   
   @interface TabViewController : UITabBarController 
   
   @end 
   

而且.m是

#import "TabViewController.h" 
#import "AppDelegate.h" 
#import "ViewController2.h" 
#import "ViewController3.h" 

@interface TabViewController() 
{ 
    AppDelegate *appDelegate; 
} 
@end 

@implementation TabViewController 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate]; 

    if (appDelegate.isAddNew == TRUE) 
    { 
     ViewController2 *view2 = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController2"]; 
     //ViewController3 *view3 = [self.storyboard instantiateViewControllerWithIdentifier:@"ViewController3"]; 

     NSMutableArray *tabViewControllers = [self.viewControllers mutableCopy]; // [[NSMutableArray alloc] init]; 
     [tabViewControllers addObject:view2]; 
     //[tabViewControllers addObject:view3]; 

     [self setViewControllers:tabViewControllers]; 

     //can't set this until after its added to the tab bar 

     // ------ First way ------ 
     view2.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Second" image:[UIImage imageNamed:@"selectimg.png"] tag:1]; 

     // ------ Second way ------ 
     view2.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Second" image:[UIImage imageNamed:@"deselectimg"] selectedImage:[UIImage imageNamed:@"selectimg.png"]]; 

     // ------ Third way ------ 
     view2.tabBarItem = [[UITabBarItem alloc] init]; 
     view2.tabBarItem.selectedImage = [[UIImage imageNamed:@"selectimg.png」]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]; 
     view2.tabBarItem.image = [[UIImage imageNamed:@"deselectimg.png」]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal ]; 
     view2.tabBarItem.title = @"Second"; 

     //view3.tabBarItem = [[UITabBarItem alloc] initWithTitle:@"Third" image:[UIImage imageNamed:@"third.png"] tag:2]; 

     [appDelegate.window setRootViewController:self]; 
    } 
} 

- (void)didReceiveMemoryWarning 
{ 
    [super didReceiveMemoryWarning]; 
    // Dispose of any resources that can be recreated. 
}