programmatically change orientation from Landscape to Portrait Mode xamarin IOS

Question

I am developing an app with Xamarin MVVMCross technology and would like to ask a question about InterfaceOrientation option: all view controllers of application support all orientations but one should use only Portrait mode. When I go to that ViewController from others in Portrait mode, I am able to keep my portrait viewcontroller in Portrait mode due to method in my AppDelegate.cs :

[Export("application:supportedInterfaceOrientationsForWindow:")]
public UIInterfaceOrientationMask GetSupportedInterfaceOrientations(UIApplication application, IntPtr forWindow)
{
    if (this.RestrictRotation)
        return UIInterfaceOrientationMask.All;
    else
        return UIInterfaceOrientationMask.Portrait;
} 

But when I go to my portraitview controller when device in LandscapeLeft(LandscapeRight) orientations, GetSupportedInterfaceOrientations from AppDelegate.cs method is not called and that view controller is opened in Landscape mode. Is there a way to programmatically change orientation from Landscape to Portrait Mode just for one view controller in Xamarin IOS?

Thank you

Answer 1

In your helper class;

public static void LockOrientation(UIInterfaceOrientationMask uIInterfaceOrientationMask, UIInterfaceOrientation uIInterfaceOrientation)
        {
            if (UIApplication.SharedApplication.Delegate != null)
            {
                CommonUtils.LockOrientation(uIInterfaceOrientationMask);
                UIDevice.CurrentDevice.SetValueForKey(new NSNumber((int)uIInterfaceOrientation), new NSString("orientation"));
            }
        }

In AppDelegate.cs

    //Set the orientation for rest of the app
public UIInterfaceOrientationMask OrientationLock = UIInterfaceOrientationMask.All;

            public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations(UIApplication application, UIWindow forWindow)
            {
                return OrientationLock;
            }

Now simply call the LockOrientation method wherever you would like to lock/change orientation.

Example:

CommonUtils.LockOrientation(UIInterfaceOrientationMask.Portrait, UIInterfaceOrientation.Portrait);