what could you recommend to store settings (API endpoint, different keys - for Facebook, twitter etc) for iOS application written on Swift? I need something to easily switch between environments - development (local iOS simulator), staging (staging server) and production (for AppStore). One of solutions i saw is the creation of class Settings with predefined constants with app settings. Is it good enough? Or maybe you can recommend me something "swift way"?

PS: if you're familiar with ruby on rails - i'm looking something like figaro gem (<https://github.com/laserlemon/figaro>)