iOS is one of the most popular operating systems in the mobile landscape. Ensuring iOS applications maintainability, scalability, and performance proves essential. However, traditional approaches often lead to poor modularity and tightly coupled code which hinders extensibility and testability. While modern architectures offer improved modularization, their adoption is often met with increased complexity and implementation overhead, leaving developers without clear guidance on best practices. This research addresses a crucial gap by systematically evaluating the modularization challenges in iOS development and providing a structured analysis of architectural patterns. Through empirical assessment and real-world application testing, the study not only highlights the trade-offs of each approach but also proposes actionable guidelines to optimize modularization. By bridging the disconnect between theoretical models and practical implementation, this work equips developers with the knowledge to build robust, maintainable, and scalable iOS applications. The insights presented in this study serve as a valuable reference for both industry professional and researchers, driving advancements in iOS software architecture.