The Mediator Design Pattern is a behavioral design pattern that is used to reduce the complexity of communication between multiple objects or classes. This pattern provides a mediator object that coordinates communication between the different objects, allowing them to communicate without directly referencing each other.
In Swift, the Mediator Design Pattern can be implemented by defining a protocol that declares the methods and properties that the mediator should have. This protocol can then be adopted by a class that acts as the mediator, coordinating communication between the different objects that use it.
To illustrate how this pattern can be used in Swift, let's consider a simple example of a chat application. In this application, we have several chat rooms, each of which has multiple users. We want to design the communication between the chat rooms and the users in such a way that the chat rooms and users are not directly dependent on each other.
To achieve this, we can define a ChatRoomMediator protocol that declares the methods and properties that the mediator should have. This protocol can be adopted by a ChatRoom class, which will act as the mediator for the different chat rooms in the application.
In Swift, the Mediator Design Pattern can be implemented by defining a protocol that declares the methods and properties that the mediator should have. This protocol can then be adopted by a class that acts as the mediator, coordinating communication between the different objects that use it.
To illustrate how this pattern can be used in Swift, let's consider a simple example of a chat application. In this application, we have several chat rooms, each of which has multiple users. We want to design the communication between the chat rooms and the users in such a way that the chat rooms and users are not directly dependent on each other.
To achieve this, we can define a ChatRoomMediator protocol that declares the methods and properties that the mediator should have. This protocol can be adopted by a ChatRoom class, which will act as the mediator for the different chat rooms in the application.
Next, we can define a User class that adopts the ChatRoomMediator protocol and uses it to communicate with other users in the chat room.
With these classes in place, we can now create a chat room and add some users to it. When a user sends a message, the mediator will coordinate the message delivery to the other users in the chat room.
In this example, when John sends a message to Jane, the mediator coordinates the message delivery, ensuring that Jane receives the message without John and Jane being directly dependent on each other. This allows us to decouple the communication between the different objects, making our code more flexible and maintainable.
