Programmatic UISplitViewController Example

SplitViewController.txt

//
//  ViewController.swift
//  SplitView
//
//  Created by Jon Schneider on 8/21/23.
//

import UIKit

class SplitViewController: UISplitViewController {

    let firstVC = {
        let vc = UIViewController()
        vc.view.backgroundColor = .gray
        return vc
    }()

    let secondVC = {
        let vc = UIViewController()
        vc.view.backgroundColor = .cyan
        return vc
    }()

    let thirdVC = {
        let vc = UIViewController()
        vc.view.backgroundColor = .orange
        return vc
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        setViewController(firstVC, for: .primary)
        if style == .doubleColumn {
            setViewController(secondVC, for: .secondary)
        } else if style == .tripleColumn {
            setViewController(secondVC, for: .supplementary)
            setViewController(thirdVC, for: .secondary)
        }
    }
}