Swift: Developing iOS Applications

Creational patterns

The final type of design patterns we will discuss is called creational patterns. These patterns relate to the initialization of new objects. At first, the initialization of an object probably seems simple and not a very important place to have design patterns. After all, we already have initializers. However, in certain circumstances, creational patterns can be extremely helpful.

Singleton/shared instance

The first patterns we will discuss are the singleton and shared instance patterns. We are discussing them together because they are extremely similar. First we will discuss shared instance, because it is the less strict form of the singleton pattern.

The idea of the shared instance pattern is that you provide an instance of your ...