Add iOS export option for device family

[RandomShaper]

If you want your iOS game to be marked explicitly as targeting iOS, iPad or both (without having to tweak the generated Xcode project), this is your PR!

As an extra benefit, if you are only interested in iPhone or iPad alone, Apple app submission won't require you to provide icons for the other family.

[Calinou]

Speaking of which, do we currently have an OS-independent way to know whether the current device is a smartphone or tablet (from the user standpoint)? I remember seeing this being requested in the past so that people can expose slightly different UIs depending on the device.

[naithar]

Speaking of which, do we currently have an OS-independent way to know whether the current device is a smartphone or tablet (from the user standpoint)? I remember seeing this being requested in the past so that people can expose slightly different UIs depending on the device.

UIDevice.currentDevice.userInterfaceIdiom - https://developer.apple.com/documentation/uikit/uidevice/1620037-userinterfaceidiom?language=objc can be used to determine this. It should be pretty easy to expose this API from iOS singleton.

[Calinou]

It should be pretty easy to expose this API from iOS singleton.

I was wondering about exposing this in an OS-independent way (e.g. in the OS singleton), so that people don't have to adapt their code twice for Android and iOS (or write their own method abstraction over the base OS-specific methods).

Either way, it might be better to open a proposal about this.

[RandomShaper]

I'd say that the right way to adapt UI to different devices should be based on physical size (screen pixel size and DPI). At least, IIRC, that's the approach in Android (you design for screens, not for devices, so to speak) and I think there's a good reason for that.

That said, I think that having a way to check if the device reports itself as tablet or phone where that's supported can also be helpful so the application can make some extra assumptions.

[akien-mga]

Thanks!

[akien-mga]

Cherry-picked for 3.4.