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Question

I am trying to run a Swift app on my iPhone 4s. It works fine on the simulator, and my friend can successfully run it on his iPhone 4s. I have iOS 8 and the official release

Answer 1

I'm using Xcode 8.3.3 and Xcode 9.2. The solution for me was to switch my default Xcode from 8 to 9 using Xcode Select:

$ xcode-select --print-path

$ sudo xcode-select -switch /Applications/Xcode-9.2.app

Edit: Actually what seemed to help here was that Xcode 9.2 used the derived data from Xcode 8.3.3. Not a solution but at least it allows me to move forward with my work.