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Objects: Access Control

Internal

Internal data is only accessible to the module in which they’re defined. A module is an application, library, or framework.

Private

Private data is only accessible to the file in which it’s declared.

Public

Public classes, methods, and properties are accessible by any part of the app.

Manning, Jon, Paris Buttfield-Addison, and Tim Nugent. Swift Development with Cocoa. O'Reilly Media, 2014

Internal is the default level of access control: if you don’t specify the access control level, it’s assumed to be internal (with exception of private classes, whose members are defaulted to private)

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Introduction to the Swift Language - Chicago Swift Developer Meetup

By Matt Houser

v 2015-04-13a

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