從appDelegate啓動導航控制器

Question

誰能告訴我如何從ÀppDelegate? I can start a開始UINavigationContoller rootViewContoller but cannot start a specific UIViewController like I was trying in commented code. The commented code starts the **ChooseTableViewController** but does not display UINavigationBar`。 什麼是更好的方法？ 這裏是我的代碼

- (void)setRootViewController:(NSString *)storyBoardName { 
    //set the Root ViewController 

    UIStoryboard *story = [UIStoryboard storyboardWithName:storyBoardName 
                bundle:nil]; 
    UINavigationController *newViewController = 
           [story instantiateInitialViewController]; 
    self.window.rootViewController = newViewController; 



    /* 
    ChooseTableViewController *chooseTableViewController = 
     [story instantiateViewControllerWithIdentifier:@"ChooseTableViewController"]; 

    self.window.rootViewController = chooseTableViewController; 

    */ 

} 

Answer 1

// Your main storyboard 
UIStoryboard *story = [UIStoryboard storyboardWithName:storyBoardName bundle:nil]; 

// Your root navigation controller 
UINavigationController *newViewController = [story instantiateInitialViewController]; 

// Your root view controller for root navigation controller 
ChooseTableViewController *chooseTableViewController = [story instantiateViewControllerWithIdentifier:@"ChooseTableViewController"]; 

// Set your view controller as root view controller of your root navigation controller 
newViewController.rootViewController = chooseTableViewController; 

// set your root navigation controller 
self.window.rootViewController = newViewController; 

Answer 2

Appdelegate.h

@property (strong, nonatomic) UIWindow *window; 
@property (strong, nonatomic) UINavigationController *navigationController; 

Appdelegate.m

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 

    self.window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds]; 

      UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil]; 

     self.navigationController = [storyboard instantiateViewControllerWithIdentifier:@"navigation"]; 
       UIViewController *viewController = [storyboard instantiateViewControllerWithIdentifier:@"ChooseTableViewController"]; 
       navigationController=[[UINavigationController alloc]initWithRootViewController:viewController]; 
    self.window.rootViewController =self.navigationController; 
      [self.window makeKeyAndVisible]; 
     return YES; 
    }