如何在ios Swift中将数据发送到自定义选项卡栏控制器

// 自定义选项卡栏控制器
class CustomTabBarController: UITabBarController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建自定义视图控制器
        let viewController1 = CustomViewController1()
        let viewController2 = CustomViewController2()
        
        // 设置自定义视图控制器
        self.addChildViewController(viewController1)
        self.addChildViewController(viewController2)
        
        // 设置选项卡栏的标题和图标
        viewController1.tabBarItem = UITabBarItem(title: "Tab 1", image: UIImage(named: "tab1"), tag: 1)
        viewController2.tabBarItem = UITabBarItem(title: "Tab 2", image: UIImage(named: "tab2"), tag: 2)
    }
}

// 自定义视图控制器
class CustomViewController1: UIViewController {
    var data: String?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 使用传递的数据
        if let data = self.data {
            print("Received data: \(data)")
        }
    }
}

class CustomViewController2: UIViewController {
    // 自定义视图控制器的实现
}