This error can occur when you rename files outside of XCode. To solve it you can just remove the files from your project (Right Click – Delete and “Remove Reference”). Then after you can re-import the files in your project and everything will be OK.
To choose a previous approach to the one supported by SwiftUI, from a project created in Xcode 11, you can follow these steps.
You have to set ViewController StoryBoardId property as below image. open viewController using coding as below in swift func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { let mainStoryboardIpad : UIStoryboard = UIStoryboard(name: “Main”, bundle: nil) let initialViewControlleripad : UIViewController = mainStoryboardIpad.instantiateViewControllerWithIdentifier(“Circles”) as UIViewController self.window = UIWindow(frame: UIScreen.main.bounds) self.window?.rootViewController = initialViewControlleripad self.window?.makeKeyAndVisible() return true … Read more
You have two options. If you want to continue manually setting the style of the status bar, continue doing what you’re doing, but you’ll need to add the following key to your info.plist file with a value of NO. View controller-based status bar appearance Or, if you want to continue to use view controller based … Read more
NOTE: The below solution no longer works on iOS 13+ devices – it will return garbage data. Please use following code instead: + (NSString *)hexadecimalStringFromData:(NSData *)data { NSUInteger dataLength = data.length; if (dataLength == 0) { return nil; } const unsigned char *dataBuffer = (const unsigned char *)data.bytes; NSMutableString *hexString = [NSMutableString stringWithCapacity:(dataLength * 2)]; … Read more
The other solution is correct in that it will get you a reference to the application’s delegate, but this will not allow you to access any methods or variables added by your subclass of UIApplication, like your managed object context. To resolve this, simply downcast to “AppDelegate” or what ever your UIApplication subclass happens to … Read more
You can access the delegate like this: MainClass *appDelegate = (MainClass *)[[UIApplication sharedApplication] delegate]; Replace MainClass with the name of your application class. Then, provided you have a property for the other view controller, you can call something like: [appDelegate.viewController someMethod];
The other solution is correct in that it will get you a reference to the application’s delegate, but this will not allow you to access any methods or variables added by your subclass of UIApplication, like your managed object context. To resolve this, simply downcast to “AppDelegate” or what ever your UIApplication subclass happens to … Read more