programmatically change orientation from Landscape to Portrait Mode xamarin IOS

2
votes

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

3
iosxamarinxamarin.iosmvvmcrossuiinterfaceorientation

3 Answers

3
votes

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);
0
votes

If you want to control the orientation of a single ViewController don't use the AppDelegate GetSupportedInterfaceOrientations method instead use the one in the ViewController you want to control.

These lines will prevent the ViewController you implement this method to get any other orientation but Portrait.

public override UIInterfaceOrientationMask GetSupportedInterfaceOrientations ()
{
    return UIInterfaceOrientationMask.Portrait;
}

Note: You will need to repeat the same for every ViewController in case you want to force the orientation to more than one.

0
votes

i hope that work.. put in your controller class

public override void DidRotate(UIInterfaceOrientation fromInterfaceOrientation)
    {
        base.DidRotate(fromInterfaceOrientation);
        UIAlertView alert = new UIAlertView();
        alert.Title = UIDevice.CurrentDevice.Orientation + "";
        alert.AddButton("ok");
        alert.Show();

    }