A customizable NSPopover alternative for macOS written in Swift based on INPopoverController
Initially a raw but functioning conversion of https://github.com/indragiek/INPopoverController (specifically the fork https://github.com/yonilevy/INPopoverController)
Thanks to objectivec2swift.com for providing the initial rough conversion - It was a fixer upper but I got it to work!