Thanks for the quick reply. I ran through the tutorials you mentioned and I understand, I need to extract that from the view - so I did.
In Swift Playgrounds, I added another file containing a single class with just the a declaration:
import PlaygroundSupport
import PlaygroundBluetooth
class ConnectionHandler {
//var centralManager: PlaygroundBluetoothCentralManager?
}
There is no link between a UI-Element and that class - just an additional Code-Snippet.
And that reproduces the problem - when I uncomment the declaration, playgrounds won't compile/start the app.
Unfortunately, there are no error messages/warnings/whatever.
Is that maybe a principle problem with Apps in Playground (not in Xcode)
rainerfromkarlsruhe
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Thank you for that hint - maybe that is the problem "under the surface".
Since Playgrounds does not provide any error message but simply refuses to "preview/run" it might well be that problem.
I tried to reproduce in a normal Playground on a Page and there I can easily combine UIKit, SwiftUI and PlaygroundBluetooth.
So I guess that has something to do with the AppPlayground Environment.