如何在Swift中以编程方式创建UISplitViewController

import UIKit

class MasterViewController: UIViewController {
    // 主视图控制器的代码
}

class DetailViewController: UIViewController {
    // 细节视图控制器的代码
}

func createSplitViewController() -> UISplitViewController {
    let splitViewController = UISplitViewController()
    
    let masterViewController = MasterViewController()
    let detailViewController = DetailViewController()
    
    splitViewController.viewControllers = [masterViewController, detailViewController]
    splitViewController.preferredDisplayMode = .allVisible
    
    return splitViewController
}

// 使用示例
let splitViewController = createSplitViewController()
// 将splitViewController设置为根视图控制器或将其添加到其他视图控制器中