如何使用titleView的视图类而不是标题来扩展TabViewItem？

// 创建一个自定义视图
let customView = UIView(frame: CGRect(x: 0, y: 0, width: 80, height: 40))
customView.backgroundColor = .lightGray

// 添加一个标签
let label = UILabel()
label.text = "Home"
label.textColor = .black
label.textAlignment = .center
label.frame = CGRect(x: 0, y: 0, width: 80, height: 20)

// 添加一个图像视图
let imageView = UIImageView(image: UIImage(named: "homeIcon"))
imageView.frame = CGRect(x: 25, y: 20, width: 30, height: 20)

// 将标签和图像视图添加到自定义视图中
customView.addSubview(label)
customView.addSubview(imageView)

// 创建一个UITabBarItem并设置自定义视图
let tabBarItem = UITabBarItem(title: "", image: nil, selectedImage: nil)
tabBarItem.titleView = customView

// 将UITabBarItem设置给对应的UIViewController
let viewController = UIViewController()
viewController.tabBarItem = tabBarItem

// 使用自动布局设置自定义视图的内容
customView.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
    label.centerXAnchor.constraint(equalTo: customView.centerXAnchor),
    label.centerYAnchor.constraint(equalTo: customView.topAnchor, constant: 5),
    imageView.centerXAnchor.constraint(equalTo: customView.centerXAnchor),
    imageView.topAnchor.constraint(equalTo: label.bottomAnchor, constant: 5)
])