In computer science, library means collection of resources and code, compiled into one or more architecture. Working with iOS application you’ll faced static and dynamic libraries.
Static library — (*.a) (static archive library, static linked shared library) — collection or archive of object files. Static linker collects app compiled source code with library code into a single executable file, which loaded into memory in its entirety at runtime.
The library can’t include resource files: images, assets, nibs, strings file and other visual data. If you will include this resources to project them will be separate from .a file.
Dynamic libraries (*.dylib) (dynamic shared library, shared object, dynamically linked library) are not copied into executable file, like static libraries. Instead, they are dynamically linked to at load or runtime, when both binary files and the library are in memory. Dynamic libraries stored and versioned separately. As a result, the dynamic library may be loaded not the same which was originally referenced if the update is considered binary compatible with the original version.
System iOS and macOS libraries are dynamic. This means that your app will receive improvements from Apple’s updates without new build submission.
Next Article: Frameworks.
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