Abstract: Abstract: To solve the problems of difficulty for beginners to write iOS programs using Swift language and the high cost of developing multi platform applications for the company， this article implements an iOS framework for Apple application development based on the concept of cross platform development， which involves writing a simple and easy to learn explanatory configuration file YAML. Firstly， the feasibility of developing Apple applications using third-party languages is investigated. Secondly， UI controls， style rendering， and network requests are abstracted and structurally defined in YAML syntax. The underlying framework completes core functions such as resource loading， data processing， control creation， and user interaction in sequence based on the structural definition. And based on this framework， an online consultation application （Aimed Care） is designed and developed， and successfully launched on the Apple Store. Coupled with the Web and Android frameworks， the goal of developing a set of code for publishing on multiple platforms can be achieved. The successful release of the application indicates that the framework meets the development standards of iOS software from the perspectives of functionality and security， and can be applied to iOS development.

Key words: Key words: iOS, Swift, framework, YAML, network requests, cross platform development