Xcode导航栏按钮对齐

从现在开始,请务必在提问时发布您的代码,因为如果不看到它,很难理解问题。

顺便说一句,这是TabBarController类的代码,它也有contentInsets 它在我的每个应用程序中都能完美运行

class TabBarController: UITabBarController {
    
         override func viewDidLoad() {
                super.viewDidLoad()
               
                let firstVeiwController = createNavController(vc: ExercisesLobby(), selected: UIImage(named: "Note")!, unselected: UIImage(named: "NoteUnselected")!)
                let secondViewController = createNavController(vc: TrainingPlansViewController(), selected: UIImage(named: "Exercises")!, unselected: UIImage(named: "ExercisesUnselected")!)
                let thirdViewController = createNavController(vc: MapViewController(), selected: UIImage(named: "Map")!, unselected: UIImage(named: "MapUnselected")!)
            
                viewControllers = [firstVeiwController, secondViewController, thirdViewController]
                tabBar.barStyle = .black
                tabBar.barTintColor = UIColor.white
                tabBar.tintColor = UIColor.black
                tabBar.unselectedItemTintColor = UIColor.lightGray.withAlphaComponent(0.9)
                additionalSafeAreaInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
            
                guard let items = tabBar.items else { return }
                
                for item in items {
                    item.imageInsets = UIEdgeInsets(top: 2, left: 0, bottom: -22, right: 0)
                }
            
            selectedViewController = secondViewController
                
            }
            
            //MARK: - Functions
            
    
           
        }

    extension UITabBarController {
        func createNavController(vc: UIViewController, selected: UIImage, unselected: UIImage) -> UINavigationController {
            
            let viewController = vc
            let navController = UINavigationController(rootViewController: viewController)
            navController.tabBarItem.image = unselected
            navController.tabBarItem.selectedImage = selected
            
            return navController
        }
    }