I'm trying to code in Swift, but it keeps telling me that there is a Code Signing Error and I don't have a developer account - Is there any way I can run code without paying the developer fee? I'm on the version 6.3.2 of XCode
Is there any way I can run code without paying the developer fee
Absolutely. It costs nothing to Build and Run your code when the destination is a Simulator. This has always been free, and remains free.
And in the future (Xcode 7?) it will be possible even to Build and Run on your device for free.