Fix to Xamarin.Mobile orientation issues on iPads

gistfile1.cs

	internal class MediaPickerPopoverDelegate : UIPopoverControllerDelegate
	{
		NSObject observer;
		UIDeviceOrientation orientation;

		internal MediaPickerPopoverDelegate (MediaPickerDelegate pickerDelegate, UIImagePickerController picker)
		{
			this.pickerDelegate = pickerDelegate;
			this.picker = picker;
			this.orientation = UIDevice.CurrentDevice.Orientation;
			this.observer = NSNotificationCenter.DefaultCenter.AddObserver (UIDevice.OrientationDidChangeNotification, DidRotate);
			ApplyOrientation();	// Do this to cater for launch of picker when already in landscape
		}

		public override bool ShouldDismiss (UIPopoverController popoverController)
		{
			return true;
		}

		public override void DidDismiss (UIPopoverController popoverController)
		{
			this.pickerDelegate.Canceled (this.picker);

			NSNotificationCenter.DefaultCenter.RemoveObserver (this.observer);
			this.observer.Dispose();
		}

		void DidRotate (NSNotification notice)
		{
			UIDevice device = (UIDevice)notice.Object;
			if (MediaPickerDelegate.IsSameOrientationKind (this.orientation, device.Orientation))
				return;

			this.orientation = device.Orientation;

			ApplyOrientation();
		}
		
		public void ApplyOrientation()
		{
			// Credit: http://stackoverflow.com/a/19071958/1685090
			float scaleFactor = 1.3f;

			CGAffineTransform rotated;
			switch (this.orientation) {
			case UIDeviceOrientation.LandscapeLeft:
				rotated = CGAffineTransform.MakeRotation((float)(Math.PI * -90 / 180));
				rotated.Scale(scaleFactor, scaleFactor);
				picker.CameraViewTransform = rotated;
				break;

			case UIDeviceOrientation.LandscapeRight:
				rotated = CGAffineTransform.MakeRotation((float)(Math.PI * 90 / 180.0));
				rotated.Scale(scaleFactor, scaleFactor);
				picker.CameraViewTransform = rotated;
				break;

			case UIDeviceOrientation.PortraitUpsideDown:
				rotated = CGAffineTransform.MakeRotation((float)(Math.PI * 180 / 180.0));
				picker.CameraViewTransform = rotated;
				break;

			default:
				rotated = CGAffineTransform.MakeRotation(0);
				picker.CameraViewTransform = rotated;
				break;
			}
		}

		private readonly MediaPickerDelegate pickerDelegate;
		private readonly UIImagePickerController picker;
	}