UIPopoverPresentationController not showing in the right position

Question

I have a popover where the SourceRect is the setting button (the button with a gear icon). The popover position is correct for all device orientation except for LandscapeLeft.

I set the anchor from XCode Interface builder and set the source rect programmatically:

var poc = segue.DestinationViewController as PVPencilOptionsController;
poc.ViewModel = this.ViewModel.ColorPicker;
var ppc = (UIPopoverPresentationController)poc.PresentationController;
ppc.SourceRect = this.PVEditIssuePhotoPencilOptionsButton.Frame;

Below are the result of popover position:

Portrait/upside down (correct):

Landscape Right (correct):

Landscape Left (wrong)

As you can see, if the device orientation is Landscape Left, there is a gap between the popover arrow and the setting button.

How to find out where this gap come from?

Answer 1

I've had simlar issues and mine was all due to the fact that I was calculating my sizing and my positioning in the wrong place, sometimes using the wrong values as well. There's two things I would suggest to find your problem:

1. Do all position/sizing calculations in LayoutSubviews: Override the LayoutSubviews in your controller and calculate your positioning information in there. After the base call.

2. Log out dimensions of Frame as well as Bounds: This way you can see what you have and where you want it to be. Do this before and after layout subviews to see the difference.