After setting rootViewController call makeKeyAndVisible. This work for me. self.window?.rootViewController = navigationVC self.window?.makeKeyAndVisible()

[Assert] UINavigationBar decoded as unlocked for UINavigationController, or navigationBar delegate set up incorrectly. Inconsistent configuration may cause problems. navigationController=<UINavigationController: 0x109822e00>, navigationBar=<UINavigationBar: 0x108b2aef0; frame = (0 44; 0 50); opaque = NO; autoresize = W; layer = <CALayer: 0x280d5f2e0>> delegate=0x109822e00 Same issue we also facing... in OS 16 after splash screen showing black screen only.