Launch current iOS App on Mac Environment

This support is disabled in Xcode 12 Beta 1.

Is this enabled in Beta 2?

Have you tried just using Xcode 11 on Mac OS 10.15 and use "My Mac" as the deployment target?

You don't need to mess around with beta software to build an iOS app for Mac OS.

Have you tried just using Xcode 11 on Mac OS 10.15 and use "My Mac" as the deployment target? You don't need to mess around with beta software to build an iOS app for Mac OS.

Its an iOS App not a Mac App with a Mac OS deployment target so there is no "My Mac" as the target.
And converting it to an MacOS project is not an option.

So my question remains:

Is this enabled in Beta 2?

And converting it to an MacOS project is not an option.

Are you sure? With my app the process was pretty much just adding "My Mac" as a target, then hitting the run button.

Just a guess here, but I suspect macOS will doing exactly the same thing, minus the recompile step, if you decide to deploy your app in the Mac App Store.

I'm sure there are a bunch of APIs that work better on macOS 11 than they do on 10.15, but my app doesn't seem to be using any of them. Maybe yours won't either.

As far as I know beta 2 isn't available yet for the DTK, so nobody [outside of Apple] knows if it will be possible to run ARM iOS apps on it.

Also, there's no rush. There might be zero work involved in "porting" your app, other than testing it thoroughly, and the deadline to get it done is several months away.

Is it possible with XCode 12 to launch the app in the actual now possible mac environment as an iOS App?

According to the publicly announced info, the answer is no. To run iOS apps natively on macOS, you need an Apple Silicon Mac running proper version of macOS 11.
If you have a Developer Transition Kit, there may be some possibility you could run iOS apps on it in the near future.
(Or now, the detail of macOS 11 beta for DTK is not clear.)

If not, you may need to wait until Apple Silicon Macs are available.

How do I get it to run on my Mac as it would if it would become available in the fall?

I guess your Mac is equipped with Intel, and then your Mac cannot run iOS apps natively, even when macOS 11 or Xcode 12 is released.

According to the publicly announced info, the answer is no. To run iOS apps natively on macOS, you need an Apple Silicon Mac running proper version of macOS 11.
If you have a Developer Transition Kit, there may be some possibility you could run iOS apps on it in the near future.
(Or now, the detail of macOS 11 beta for DTK is not clear.)

If not, you may need to wait until Apple Silicon Macs are available.

This is definitely not correct. All Macs that run Big Sur will run iOS Apps with Big Sur natively.

So:
I'm still waiting for an answer from any official apple member, looking at you @jeremyhu

Not sure where you got that idea Alijoscha. They are very clear about this being supported on Apple Silicon Macs only. Here’s the relevant WWDC video:

https://developer.apple.com/videos/play/wwdc2020/10114/

This is definitely not correct. All Macs that run Big Sur will run iOS Apps with Big Sur natively.

I'm very curious. What source lets you say definitely? Please show us the source.

Starting from Xcode 12 Beta 3, you can do it now.

@billylo

Do I also have to install Big Sur Beta for this or is it running on Catalina as well?

@billylo

It isn't working on Beta 4 on Catalina. You got Big Sur?

@jeremyhu
Still waiting for an update here.
I tested this with Beta 4 on Catalina and it's still not possible.
Do I need to run Big Sur Beta plus Xcode Beta3+ to get it running on an Intel Mac?