Swift has 5 levels of access control. Access levels can be applied to types (classes, enums, structs) as well as properties, methods, initializers and subscripts.
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open- accessable from any file inside the module + from any file in other modules
- applies only to classes and class members
- open classes can be subclassed within other modules
- open class members can be overriden by subclasses within other moudles
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public- accessable from any file inside the module + from any file in other modules
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internal- accessable from any file inside the module
- this is the default value if you dont specify any level
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fileprivate- accessable within its own sourcefile
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private- accessable to the enclosing declaration