I am trying to find a way to set a UI element to a physical size (in the real world) across all devices. For example: in pages on Ipad, when you zoom in / out you see a % scale, and at 100% it says "Actual" because the page onscreen is the same width as a real piece of paper. I would like to set my scroll view / PKCanvas view to the size of a real piece of (a4) paper but have not found a way to achieve this aside from hard coding values. Constraints are sized using points so I expect to need some conversion scale, unique to each device (eg. how many points = 1cm).

I am looking at adding support for mac computers to some of my Ipad apps, and am trying to add a simple help description under the menu bar. In the default menu bar of the app there is a "Help" UIMenu. Click on it and there is a button which says "[app name] Help". By default it has an alert dialogue popup with your app icon, the title "Help" and a message "Help isn't available for [app name]". I was simply going to direct them to the Q/A page I already have made but am unsure how to change these texts.

Hi, my app has a few in-app shortcuts which are controlled in the app. When I am on my Ipad with a hardware keyboard and using some other apps (like apple’s “notes”), I can press and hold the “Command” key for a few seconds and a list of these shortcuts appear (see below). I would like to list mine in the app like this but haven’t seen what it is called or how to do this.