如何在以编程方式使用导航控制器设置动画的情节提要中设置根视图控制器

Question

I have my login screen how ever i can able to skip that screen and go to home page when I am in the home page I could`d able to get my navigation controller in my home page i have embedded navigation controller with my login page have connectivity via push segue to home page every thing is good but nav bar is not coming in homepage if I try to embedded nav controller in homepage then also its not coming ... my code is

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
     NSUserDefaults *defaults =[NSUserDefaults standardUserDefaults];

     if (![defaults boolForKey:@"registered"])

     {   NSLog(@"no user register ");
     UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
     ViewController *secondViewController = [storyBoard instantiateViewControllerWithIdentifier:@"LoginPage"];
     self.window.rootViewController = secondViewController;
     // then set your root view controller

     }

     else

     {   NSLog(@"user is daam sure registered");


     UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] ;
         ;
     ABDB_CAMERAHOME *mainviewcontroller = [storyBoard instantiateViewControllerWithIdentifier:@"CameraHome"];

              self.window.rootViewController = mainviewcontroller;
     }

    return YES;
}

is their I am missing constraint about nav controller in program please suggest

Answer 1

In latest Xcode 6.1 in storyboards their are settings for navigation controller bar visibility. You can tick the "Shows Navigation Bar" for display.

Answer 2

In your appDelegate.h add below property and synthesize in .m

@property(strong,nonatomic)UINavigationController *navigationController;

@synthesize navigationController;

now modify app delegate as below

    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    NSUserDefaults *defaults =[NSUserDefaults standardUserDefaults];
    if (![defaults boolForKey:@"registered"])
    {   NSLog(@"no user register ");
        UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
        ViewController *secondViewController = [storyBoard instantiateViewControllerWithIdentifier:@"LoginPage"];
        self.navigationController=[[UINavigationController alloc]initWithRootViewController:secondViewController];
        self.window.rootViewController = self.navigationController;
        // then set your root view controller
    }

    else

    {   NSLog(@"user is daam sure registered");
        UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] ;
        ;
        ABDB_CAMERAHOME *mainviewcontroller = [storyBoard instantiateViewControllerWithIdentifier:@"CameraHome"];
        self.navigationController=[[UINavigationController alloc]initWithRootViewController:mainviewcontroller];
        self.window.rootViewController = self.navigationController;
    }

    return YES;
}

Once all is set, check your storyboard whether you have mentioned proper xib identifier names over there? Also if you have used any navigation controller there, remove that also. Now clean the project from build setting and re-run.

Answer 3

用户使用以下方法通过导航设置rootViewController：

[(UINavigationController*)self.window.rootViewController pushViewController:yourViewController animated:YES];