Check if running in preview mode?

Developer Tools & Services Swift Playgrounds
Dirk-FU OP
Created Feb ’22
Replies 1
Boosts 0
Views 1.2k
Participants 2

I'm using Swift Playgrounds 4 to develop a test app containing some network code. Unfortunately Playgrounds runs the whole app code multiple times, at least two times: Once for the preview and once when you press "play".

This causes multiple instances of the network code to be running and makes testing very hard. Is there a way to check if the code is running in preview? Unfortunately the usual suggested solution using ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] does not work, because this results in "1" in both cases.

Replies  1
Boosts  0
Views  1.2k
Participants  2
VectorMonkey OP
Feb ’22

This is hacky but maybe you could check the size of your root view since running is full screen and the previews are inset.

0
Check if running in preview mode?
First post date Last post date
 
 
Q