I wrote an application and its base SDK is installed in 4.2, and at the moment it is in the application store with the deployment target set to 4.2, I am sure you will agree that this is a bad idea, because I am alienating all potential users who do not have the latest version of iOS installed.
So my question is: when deploying for an older version of iOS, how can I make sure it will run, that is, how can I check if I used any modern API that is not in the target version of iOS for deployment?
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