Libraries, Frameworks, Packages.

In this article, we will talk about options to support modular codebase in iOS Swift-based project with:

• Libraries.
• Frameworks (including XCFramework bundle type).
• Swift packages.

The concept of code organization and access control in Swift based on Modules. The module represented as a single unit of code distribution. Frameworks, libraries, swift packages and build targets treated in Xcode as a separate module. Each with its namespace and access controls. Module, usually, solves a particular problem. It can be reused in different situations.

Bundle is a file directory with subdirectories inside. On iOS, bundles serve to conveniently ship related files together in one package — for instance, images, nibs, or compiled code. The system treats it as one file and you can access bundle resources without knowing its internal structure. Dylib that cannot be linked, only opened in runtime with dlopen()

Source file is single Swift source code file within a module.

Executable — main binary for application.

Object file — An object file is a file containing object code, meaning relocatable format machine code that is usually not directly executable. An object file may also work like a shared library.

Object code — In computing, object code or object module is the product of a compiler. In a general sense object code is a sequence of statements or instructions in a computer language, usually a machine code language (i.e., binary or an intermediate language such as register transfer language).

Next Article: Libraries.

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