Objective-C

Periphery cannot analyze Objective-C code since types may be dynamically typed.

By default, Periphery does not assume that declarations accessible by the Objective-C runtime are in use. If your project is a mix of Swift & Objective-C, you can enable this behavior with the --retain-objc-accessible option. Swift declarations that are accessible by the Objective-C runtime are those that are explicitly annotated with @objc or @objcMembers, and classes that inherit NSObject either directly or indirectly via another class.

Alternatively, the --retain-objc-annotated option can be used to only retain declarations that are explicitly annotated with @objc or @objcMembers. Types that inherit NSObject are not retained unless they have explicit annotations. This option may uncover more unused code, but with the caveat that some of the results may be incorrect if the declaration is used in Objective-C code. To resolve these incorrect results, you must add an @objc annotation to the declaration.