In order to improve efficiency and quality of mobile application development on the iOS platform, this paper proposes a framework named AF4iOS, which is designed based on class libraries and existing software frameworks on iOS platform. The AF4iOS framework is divided into three independent layers: user interface (UI) layer, domain layer and resource layer. The AF4iOS framework encompasses a variety of components, which encapsulate the usage, and accessing of various resources, such as UI, data, web service and communication. These extensible and reusable components can accelerate the progress of development and enhance the quality of product. Finally, the availability and effectiveness of the AF4iOS framework is demonstrated through a case study.

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