Question

My goal is to keep same coordinates for a UIPopoverController with just changing arrow offset.
So basically i have three buttons touching each of them shows up a popover. When presenting this popover it changes position on the screen, but i do not want that.
To be more clear look at screenoshots:

Answer 1

For my popover I wanted the arrow to be top-left instead of top-center (which is default).

I’ve managed to get the result below (screenshot) by setting the popoverLayoutMargins property of the UIPopoverController. You can use it to reduce the screen-area used in the internal calculations of the UIPopoverController to determine where to show the popover.

The code:

// Get the location and size of the control (button that says "Drinks")
CGRect rect = control.frame;

// Set the width to 1, this will put the anchorpoint on the left side
// of the control
rect.size.width = 1;

// Reduce the available screen for the popover by creating a left margin
// The popover controller will assume that left side of the screen starts
// at rect.origin.x
popoverC.popoverLayoutMargins = UIEdgeInsetsMake(0, rect.origin.x, 0, 0);

// Simply present the popover (force arrow direction up)
[popoverC presentPopoverFromRect:rect inView:self.view permittedArrowDirections:UIPopoverArrowDirectionUp animated:YES];

I think you’ll be able to get the desired result by tweaking the above.