UITabBarController图标在触摸时改变高度

class ViewController: UIViewController, UITabBarControllerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let tabBarController = UITabBarController()
        tabBarController.delegate = self
        
        // 创建并设置子视图控制器
        
        self.addChild(tabBarController)
        self.view.addSubview(tabBarController.view)
        tabBarController.didMove(toParent: self)
    }
    
    func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
        guard let tabBarItems = tabBarController.tabBar.items else {
            return true
        }
        
        let selectedIndex = tabBarController.selectedIndex
        let willSelectIndex = tabBarController.viewControllers?.firstIndex(of: viewController) ?? NSNotFound
        
        if willSelectIndex != NSNotFound && willSelectIndex != selectedIndex {
            let selectedTabBarItem = tabBarItems[selectedIndex]
            let willSelectTabBarItem = tabBarItems[willSelectIndex]
            
            // 修改选中和即将选中的标签图标高度
            selectedTabBarItem.imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: -10, right: 0)
            willSelectTabBarItem.imageInsets = UIEdgeInsets(top: 0, left: 0, bottom: 10, right: 0)
        }
        
        return true
    }
}