Swift Beginner: How to run code only in development mode

Sometimes when we are programming, we wan to run some code only in development mode, for example changing the URL of an API from Development to Production or filling a Login View with a test user and password.

To do this we can use the #if #elseif #else #endif statements to define a Conditional Compilation Block like is stated in the swift documentation

#if DEBUG
usernameTextField.text = "swift"
passwordTextField.text = "swiftIsAwesome"
#endif

By default this code is removed from a Release version, you can also define your own flags using Xcode Active Compilation Conditions defined in your Target Build Settings / Swift Compiler-Custom Flags

Until the next time…