iOS. How to enable and disable rotation on each UIViewController?

Question

I have an UIViewController, I want to disable or enable rotation of the screen in different scenarios

Example:

if flag {
   rotateDevice = false
}
e         


        

Answer 1

In swift 5, as from previous, if you want to allow (avoid others) a particular UIViewController to rotate in a certain orientation you have to override "supportedInterfaceOrientations" inside your UIViewController class like so:

class MyViewController:UIViewController{
    override var supportedInterfaceOrientations: UIInterfaceOrientationMask{
        get{
            return .portrait
        }
    }
}

Here there are the possible options:

public struct UIInterfaceOrientationMask : OptionSet {

    public init(rawValue: UInt)


    public static var portrait: UIInterfaceOrientationMask { get }

    public static var landscapeLeft: UIInterfaceOrientationMask { get }

    public static var landscapeRight: UIInterfaceOrientationMask { get }

    public static var portraitUpsideDown: UIInterfaceOrientationMask { get }

    public static var landscape: UIInterfaceOrientationMask { get }

    public static var all: UIInterfaceOrientationMask { get }

    public static var allButUpsideDown: UIInterfaceOrientationMask { get }
}

Extended

If you want to be able to distinguish between iPad or iPhone you could use UIUserInterfaceIdiom:

override var supportedInterfaceOrientations: UIInterfaceOrientationMask{
    get{
        return UIDevice.current.userInterfaceIdiom == .phone ? [.portrait, . portraitUpsideDown]:.all //OBS -> You can also return an array
    }
}

where:

public enum UIUserInterfaceIdiom : Int {


    case unspecified

    @available(iOS 3.2, *)
    case phone // iPhone and iPod touch style UI

    @available(iOS 3.2, *)
    case pad // iPad style UI

    @available(iOS 9.0, *)
    case tv // Apple TV style UI

    @available(iOS 9.0, *)
    case carPlay // CarPlay style UI
}