Rotate Only One ViewController to Landscape Orientation

Rotate.swift

// 1. First of all, you need to make sure “Device Orientation” only on ‘Portrait’ mode.

//2. Add these two functions to AppDelegate, which helps you deal with embed in nav bar/tab bar situation mentioned above:

protocol Rotatable: AnyObject {
  func resetToPortrait()
}

extension Rotatable where Self: UIViewController {
  func resetToPortrait() {
    UIDevice.current.setValue(Int(UIInterfaceOrientation.portrait.rawValue), forKey: "orientation")
  }
    
  func setToLandscape() {
    UIDevice.current.setValue(Int(UIInterfaceOrientation.landscapeLeft.rawValue), forKey: "orientation")
  }
}

extension AppDelegate {
  func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
    guard
      let _ = topViewController(for: window?.rootViewController) as? Rotatable
      else { return .portrait }

      return .allButUpsideDown
  }

  private func topViewController(for rootViewController: UIViewController!) -> UIViewController? {
    guard let rootVC = rootViewController else { return nil }

    if rootVC is UITabBarController {
      let rootTabBarVC = rootVC as! UITabBarController

      return topViewController(for: rootTabBarVC.selectedViewController)
    } else if rootVC is UINavigationController {
      let rootNavVC = rootVC as! UINavigationController

      return topViewController(for: rootNavVC.visibleViewController)
    } else if let rootPresentedVC = rootVC.presentedViewController {
      return topViewController(for: rootPresentedVC)
    }

    return rootViewController
  }
}

// 3. Finally, go to the specific view controller you planned to allow rotate
import UIKit

final class ABCViewController: UIViewController, Rotatable {
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        resetToPortrait()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        setToLandscape()
    }
}