To take the next step with your application, the following resources are
recommended.
Token Downscoping: In this quick start guide you used a developer token to make your first call. To implement a scalable solution you should have a server-side solution to generate downscoped tokens to replace that implementation.
Official JWT sample application: Bundled with the iOS SDK, this sample application will get you started quickly with a properly structured Box JWT application, which doesn’t require user login.
Official OAuth 2 sample application: Bundled with the iOS SDK, this sample application will get you started quickly with a properly structured Box OAuth 2 application, which requires user login.