所有 ViewController 都要继承自中间类，包括 TabBarController 和 NavigationController，当有这两者时，其 ChildViewController 的方向跟随 TabBarController 和 NavigationController。重写的方法直接 return topViewController 的对应值

Navigation

class BaseNavigationController: UINavigationController {
  
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return topViewController?.supportedInterfaceOrientations ?? self.supportedInterfaceOrientations
    }
    
    override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
        return topViewController?.preferredInterfaceOrientationForPresentation ?? self.preferredInterfaceOrientationForPresentation
    }
}

普通界面的基类返回当前 APP 的主要方向（一般为竖屏）

class BaseViewController: UIViewController {

    override var shouldAutorotate: Bool {
        return true
    }
    
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return .portrait
    }
    
    override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
        return .portrait
    }
}

TabBar 返回自己的方向，避免在 TabBar 旋转

class HomeTabBarController: RAMAnimatedTabBarController {
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return .portrait
    }
    
    override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
        return .portrait
    }
}

第一个 ViewController，不用加关于旋转屏的代码

class ViewController: BaseViewController {
    
    @objc func pushTUI() {
        self.navigationController?.pushViewController(ToViewController(), animated: true)
    }
    
    @objc func presentTUI() {
        let vc = ToViewController()
        vc.modalPresentationStyle = .overFullScreen
        self.present(vc, animated: true, completion: nil)
    }
    // MARK: - Life Cycle
    override func viewDidLoad() {
        super.viewDidLoad()
        commonLoad()
    }
    
    private func commonLoad() {
        view.addSubview(pushBtn)
        view.addSubview(presentBtn)
    }

    private lazy var pushBtn: UIButton = {
        let btn = UIButton(frame: CGRect(x: 60, y: 200, width: 80, height: 80))
        btn.backgroundColor = UIColor.blue
        btn.setTitle("Push", for: .normal)
        btn.addTarget(self, action: #selector(pushTUI), for: .touchUpInside)
        return btn
    }()
        
    private lazy var presentBtn: UIButton = {
        let btn = UIButton(frame: CGRect(x: 60, y: 300, width: 80, height: 80))
        btn.backgroundColor = UIColor.red
        btn.setTitle("Present", for: .normal)
        btn.addTarget(self, action: #selector(presentTUI), for: .touchUpInside)
        return btn
    }()
}

需要强制横屏后进入的 ViewController

class ToViewController: BaseViewController {
    
    // MARK: - 旋转屏
    override var prefersStatusBarHidden: Bool {
        // 隐藏状态栏
        return false
    }
    
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
        return .landscapeRight
    }
    
    override var preferredInterfaceOrientationForPresentation: UIInterfaceOrientation {
        return .landscapeRight
    }
    
    // MARK: - 侧滑手势（Push 的需要加）
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        navigationController?.interactivePopGestureRecognizer?.isEnabled = false
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        navigationController?.interactivePopGestureRecognizer?.isEnabled = false
    }
    
    override func dismiss(animated flag: Bool, completion: (() -> Void)? = nil) {
        // Push 的需要加
        UIDevice.current.setValue(NSNumber(value: UIInterfaceOrientation.portrait.rawValue), forKey: "orientation")
        super.dismiss(animated: flag, completion: completion)
    }
    
    @objc func dismissTUI() {
        self.dismiss(animated: true, completion: nil)
    }
    
    // MARK: - Life Cycle
    override func viewDidLoad() {
        super.viewDidLoad()
        commonLoad()
    }
    
    private func commonLoad() {
        // Push 的需要加
        UIDevice.current.setValue(NSNumber(value: UIInterfaceOrientation.landscapeRight.rawValue), forKey: "orientation")
        if presentingViewController != nil {
            view.backgroundColor = .red
        } else {
            view.backgroundColor = .blue

        }
        view.addSubview(dismissBtn)
    }
    
    private lazy var dismissBtn: UIButton = {
        let btn = UIButton(frame: CGRect(x: 60, y: 200, width: 80, height: 80))
        btn.backgroundColor = .black
        btn.setTitle("dismiss", for: .normal)
        btn.addTarget(self, action: #selector(dismissTUI), for: .touchUpInside)
        return btn
    }()
}

Tips

iOS 13 开始 present ViewController 时需要设置一下 modalPresentationStyle, 要在创建的时候设置，不要在viewDidLoad里设置

@objc func presentTUI() {
    let vc = ToViewController()
    vc.modalPresentationStyle = .overFullScreen
    self.present(vc, animated: true, completion: nil)
}