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Okay, so you’ve stumbled upon this terribly annoying error message: UISceneSession is only available in iOS 13.0 or newer, now what? The best answer is to simply update the software on the iPhone that you are trying to run your app.
The worse answer is to actually go in to the code by hand and add @available attributes to the parts of the boilerplate code generated by Xcode that aren’t compatible with the older version of iOS running on your test device. But in my opinion this is trying to swim against the current. Just go ahead and update the software on your phone and all will be well.
Although if I remember correctly, this is always going to be sort of a damned-if-you-update, damned-if-you-don’t-update sort of situation. You may end up finding yourself running into the opposite situation: You update the version of iOS on your iPhone, then the older version of Xcode becomes out of sync with your device. Unfortunately this is just the way of native mobile development— a never ending series of software updates.