Given a class property, you can specify a different access level by prefixing the property declaration with the access modifier followed by get
or set
between parenthesis. For example, a class property with a public getter and a private setter will be declared as:
private(set) public var readonlyProperty: Int
Suggested reading: Getters and Setters
Martin’s considerations about accessibility level are still valid – i.e. there’s no protected
modifier, internal
restricts access to the module only, private
to the current file only, and public
with no restrictions.
Swift 3 notes
2 new access modifiers, fileprivate
and open
have been added to the language, while private
and public
have been slightly modified:
-
open
applies to class and class members only: it’s used to allow a class to be subclassed or a member to be overridden outside of the module where they are defined.public
instead makes the class or the member publicly accessible, but not inheritable or overridable -
private
now makes a member visible and accessible from the enclosing declaration only, whereasfileprivate
to the entire file where it is contained
More details here.