Example main.swift

main.swift

NSSetUncaughtExceptionHandler { print("🧨", $0) }

let isUITesting = /* your UI test detection here */
let isUnitTesting = NSClassFromString("XCTest") != nil
let noTests = !isUnitTesting && !isUITesting

let delegate = isUITesting
    ? NSStringFromClass(UITestAppDelegate.self)
    : noTests ? NSStringFromClass(AppDelegate.self)
    : nil

print("🚀 Using AppDelegate:", delegate as AnyObject)

let argc = CommandLine.argc
let argv = UnsafeMutableRawPointer(CommandLine.unsafeArgv)
    .bindMemory(to: UnsafeMutablePointer<Int8>?.self, capacity: Int(CommandLine.argc))

UIApplicationMain(argc, argv, nil, delegate)