Swift 4 Protocol-Oriented Programming - Third Edition

Classes

In object-oriented programming, we cannot create an object without a blueprint that tells the application what properties and methods to expect from the object. In most object- oriented languages, this blueprint comes in the form of a class. A class is a construct that allows us to encapsulate the properties, methods, and initializers of an object into a single type. Classes can also include other items, such as subscripts; however, we are going to focus on the basic items that make up classes not only in Swift, but in other languages as well.

Let's look at how we would use a class in Swift:

class MyClass { 
  var oneProperty: String 
 
  init(oneProperty: String) { 
    self.oneProperty = oneProperty 
  } 
 
  func oneFunction() { 
 
  } 
} 

An instance of ...