Scarlet" refers to a specific library, framework, or technology related to iOS development that has been introduced after my last update, I suggest looking for official documentation, release notes, or online resources associated with it. Typically, developers provide detailed information about the key features, functionalities, and use cases for their frameworks scarlet ios.

If you have a specific context or more details about what "Scarlet" refers to in the iOS development context, feel free to provide additional information, and I'll do my best to assist you.