Typically this happens because your view controller hasn’t loaded its view hierarchy yet. A view controller only loads its view hierarchy when something sends it the view message. The system does this when it is time to actually put the view hierarchy on the screen, which happens after things like prepareForSegue:sender: and viewWillAppear: have returned. … Read more
No hacks or funkiness required here. The key is defining the desired appearance and setting this value on BOTH the nav bar’s standardAppearance AND its scrollEdgeAppearance. I have the following in the init for my base navigation controller subclass for my entire app: if #available(iOS 13.0, *) { let navBarAppearance = UINavigationBarAppearance() navBarAppearance.configureWithOpaqueBackground() navBarAppearance.titleTextAttributes = … Read more
Segue Identifier is not the same as storyboard ID, storyboard ID used when you want to create a View Controller based on that specific storyboard -and it has to be unique, unlike the segue identifier-. If you already know how to create a segue, you can skip this part. Adding a segue between two viewControllers: … Read more
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 … Read more
How to without a dummy initial view controller Ensure all initial view controllers have a Storyboard ID. In the storyboard, uncheck the “Is initial View Controller” attribute from the first view controller. If you run your app at this point you’ll read: Failed to instantiate the default view controller for UIMainStoryboardFile ‘MainStoryboard’ – perhaps the … Read more
Let’s assumed we stand at the firstView go to the DetailView and want passing data from firstView to Detailview. To do that with storyboard, at the firstView we will have a method: override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) { if (segue.identifier == “segueTest”) { //Checking identifier is crucial as there might be multiple // segues … Read more
I resolved this issue as I was typing the question. I figured I’d answer my question and leave it here for anyone else who may face this issue when using Xcode 6 beta 4. To resolve this issue, you need to select each of your custom class objects in Storyboard (this includes any custom views, … Read more
In a Nutshell An unwind segue (sometimes called exit segue) can be used to navigate back through push, modal or popover segues (as if you popped the navigation item from the navigation bar, closed the popover or dismissed the modally presented view controller). On top of that you can actually unwind through not only one … Read more
Swift 4 First, add a notification in each button action: NotificationCenter.default.post(name: Notification.Name(“buttonAIsPressed”), object: nil) now add a notification listener in the viewDidLoad of the collection view class and call the function in the selector: NotificationCenter.default.addObserver(self, selector: #selector(self.YourFunctionName), name: Notification.Name(“buttonAIsPressed”), object: nil) now whenever a button is pressed the function you named will be called.