Ios – Black screen when creating UITabBarController from xib

iosswiftuitabbarcontrollerxib

I try to create UITabBarController from xib. So I setup tab items in xib, connect classes and xibs names for controllers like that. Open image in full resolution.

like that

Then I set TabBarController as root view controller.

root view controller

As result, I get a black screen with no tab items.

black screen

I can create UITabBarController programmatically, so the question is: how can I get what I create in xib?

Best Answer

There is a special way in which view controllers within nibs must be loaded, else the class is loaded without any of the backing UI.

Create the following method in TabBarController:

class func instantiateFromNib() -> TabBarController {
    let nib = UINib(nibName: "TabBarController", bundle: nil)
    let vc = nib.instantiate(withOwner: nil, options: nil).first as! TabBarController
    return vc
}

Now, in your AppDelegate, invoke it like so:

window = UIWindow(frame: UIScreen.main.bounds)
window?.rootViewController = TabBarController.instantiateFromNib()
window?.makeKeyAndVisible()

Give this a try.

Related Solutions

Ios – Best practices for Storyboard login screen, handling clearing of data upon logout

Your storyboard should look like this

In your appDelegate.m inside your didFinishLaunchingWithOptions

//authenticatedUser: check from NSUserDefaults User credential if its present then set your navigation flow accordingly

if (authenticatedUser) 
{
    self.window.rootViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateInitialViewController];        
}
else
{
    UIViewController* rootController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"LoginViewController"];
    UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:rootController];

    self.window.rootViewController = navigation;
}

In SignUpViewController.m file

- (IBAction)actionSignup:(id)sender
{
    AppDelegate *appDelegateTemp = [[UIApplication sharedApplication]delegate];

    appDelegateTemp.window.rootViewController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateInitialViewController];
}

In file MyTabThreeViewController.m

- (IBAction)actionLogout:(id)sender {

    // Delete User credential from NSUserDefaults and other data related to user

    AppDelegate *appDelegateTemp = [[UIApplication sharedApplication]delegate];

    UIViewController* rootController = [[UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]] instantiateViewControllerWithIdentifier:@"LoginViewController"];

    UINavigationController* navigation = [[UINavigationController alloc] initWithRootViewController:rootController];
    appDelegateTemp.window.rootViewController = navigation;

}

Swift 4 Version

didFinishLaunchingWithOptions in app delegate assuming your initial view controller is the signed in TabbarController.

if Auth.auth().currentUser == nil {
        let rootController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "WelcomeNavigation")
        self.window?.rootViewController = rootController
    }

    return true

In Sign up view controller:

@IBAction func actionSignup(_ sender: Any) {
let appDelegateTemp = UIApplication.shared.delegate as? AppDelegate
appDelegateTemp?.window?.rootViewController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateInitialViewController()
}

MyTabThreeViewController

 //Remove user credentials
guard let appDel = UIApplication.shared.delegate as? AppDelegate else { return }
        let rootController = UIStoryboard(name: "Main", bundle: Bundle.main).instantiateViewController(withIdentifier: "WelcomeNavigation")
        appDel.window?.rootViewController = rootController

Ios – Black screen after presenting modal view controller in current context from UITabBarController

I had the same issue and was able to solve it by setting self.definesPresentationContext = YES; on the presenting view controller before presenting the modal VC. You can also set this in a storyboard, the checkbox is called "Defines Context" in Interface Builder.

Best Answer

Related Solutions

Ios – Best practices for Storyboard login screen, handling clearing of data upon logout

Ios – Black screen after presenting modal view controller in current context from UITabBarController

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