Set position of nspopover - swift

Question

I have a view controller (A), which will show another viewcontroller (B) as a popover.
In my VC (A) is an NSButton with this IBAction:
self.presentViewController(vcPopover, asPopoverRelativeTo: myButton.bounds, of: myButton, preferredEdge: .maxX, behavior: .semitransient)
The result:
now I would like to change the position of my popover - I would like to move it up.
I tried this:
let position = NSRect(origin: CGPoint(x: 100.0, y: 120.0), size: CGSize(width: 0.0, height: 0.0))
self.presentViewController(vcPopover, asPopoverRelativeTo: position, of: myButton, preferredEdge: .maxX, behavior: .semitransient)
But the position does not change
ANOTHER EXAMPLE
I have a segmented control. If you click on segment "1" a popover will be shown (same code like above). But the arrow pointed to segment "2" instead to segment "1"

Answer 1

First, ensure your popover is really an NSPopover and not simply an NSViewController. Assuming the view controller you want to wrap in the popover has a storyboard id of "vcPopover", getting the content vc would look like:
let popoverContentController = NSStoryboard(name: NSStoryboard.Name(rawValue: "Main"), bundle: nil).instantiateController(withIdentifier: NSStoryboard.SceneIdentifier(rawValue: "vcPopover")) as! NSViewController
Then, wrap it in a popover:
let popover = NSPopover()
popover.contentSize = NSSize(width: 200, height: 200) // Or whatever size you want, perhaps based on the size of the content controller
popover.behavior = .semitransient
popover.animates = true
popover.contentViewController = popoverContentController
Then, to present, call show(relativeTo:of:preferredEdge:):
vcPopover.show(relativeTo: myButton.bounds, of: myButton, preferredEdge: .maxX)
This should update the position of the popover.
Update: You are likely using an NSSegmentedControl, which means you need to pay special attention to the rect you pass in show. You need to pass a bounds rect within the segmented control's coordinate system that describes the area of the segment. Here's a detailed example:
// The view controller doing the presenting
class ViewController: NSViewController {
...
var presentedPopover: NSPopover?
#IBAction func selectionChanged(_ sender: NSSegmentedControl) {
let segment = sender.selectedSegment
if let storyboard = storyboard {
let contentVC = storyboard.instantiateController(withIdentifier: NSStoryboard.SceneIdentifier("vcPopover")) as! NSViewController
presentedPopover = NSPopover()
presentedPopover?.contentSize = NSSize(width: 200, height: 200)
presentedPopover?.behavior = .semitransient
presentedPopover?.animates = true
presentedPopover?.contentViewController = contentVC
}
presentedPopover?.show(relativeTo: sender.relativeBounds(forSegment: segment), of: sender, preferredEdge: .minY)
}
}
extension NSSegmentedControl {
func relativeBounds(forSegment index: Int) -> NSRect {
// Assuming equal widths
let segmentWidth = bounds.width / CGFloat(segmentCount)
var rect = bounds
rect.size.width = segmentWidth
rect.origin.x = rect.origin.x + segmentWidth * CGFloat(index)
return rect
}
}
Notice that the extension to NSSegmentedControl calculates an approximate rectangle for the segment using the width. This method assumes equal widths and does not account for borders. You may modify this method to account for what you need. Information about getting the frame of a segment for iOS (which is similar) can be found here.
This example is verified as working correctly as long as a view controller exists in the same storyboard with a storyboard identifier of "vcPopover".