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I'm trying to declare a instance property in swift so that it is only visible to it's class and subclasses. I believe this would be referred to as a protected property in other languages. Is there a way to achieve this in Swift?
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Subclassing is the act of basing a new class on an existing class. The subclass inherits characteristics from the existing class, which you can then refine. You can also add new characteristics to the subclass.
In swift to override inherited properties or methods in subclass we use override keyword which will tells the compiler to check the overriding method or property definition matches with the base class or not.
Swift version: 5.6. The override is used when you want to write your own method to replace an existing one in a parent class. It's used commonly when you're working with UIViewControllers , because view controllers already come with lots of methods like viewDidLoad() and viewWillAppear() .
Inheritance in Swift. In Swift programming language, a class can inherit properties, methods and other characteristics from another class. Inheriting these properties and attributes from one class to another class is known as inheritance.
Access control along inheritance lines doesn't really fit with the design philosophies behind Swift and Cocoa:
When designing access control levels in Swift, we considered two main use cases:
- keep
privatedetails of a class hidden from the rest of the app- keep
internaldetails of a framework hidden from the client appThese correspond to
privateandinternallevels of access, respectively.In contrast,
protectedconflates access with inheritance, adding an entirely new control axis to reason about. It doesn’t actually offer any real protection, since a subclass can always expose “protected” API through a new public method or property. It doesn’t offer additional optimization opportunities either, since new overrides can come from anywhere. And it’s unnecessarily restrictive — it allows subclasses, but not any of the subclass’s helpers, to access something.
There's further explanation on Apple's Swift blog.
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