Enumerations
So far, we have covered two of the three types of classification in Swift: structure and class. The third classification is called enumeration. Enumerations are used to define a group of related values for an instance. For example, if we want values to represent one of the three primary colors, an enumeration is a great tool.
Basic declaration
An enumeration is made up of cases much like a switch and uses the keyword enum
instead of struct
or class
. An enumeration for primary colors should look like this:
enum PrimaryColor { case Red case Green case Blue }
You can then define a variable with this type and assign it one of the cases:
var color = PrimaryColor.Green
Note that, to use one of the values, we must use the name of the type followed ...
Get Swift: Developing iOS Applications now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.