How to rotate orientation programmatically in Swift?

Question

I tried the next:

UIDevice.currentDevice().setValue(UIInterfaceOrientation.Portrait.rawValue, forKey: \"orientation\")

on

Answer 1

Swift 4:

Step1:

In Appdelegate - Declare deviceOrientation var which is portrait by default

import UIKit
let appDelegate = UIApplication.shared.delegate as! AppDelegate
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    var deviceOrientation = UIInterfaceOrientationMask.portrait
    func application(_ application: UIApplication, supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
        return deviceOrientation
    }
}

Step 2:

In your certain ViewController write this to change orientation -

 override func viewWillAppear(_ animated: Bool) {
     appDelegate.deviceOrientation = .landscapeLeft
     let value = UIInterfaceOrientation.landscapeLeft.rawValue
     UIDevice.current.setValue(value, forKey: "orientation")
 }