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iOS Swift supports various design patterns that can be used to structure and organize code for better readability, maintainability, and scalability. Here are some of the most commonly used design patterns in iOS Swift:

1. Model-View-Controller (MVC) pattern: This is a widely used design pattern in iOS Swift that separates the code into three main components: Model, View, and Controller. The Model is responsible for storing data, the View is responsible for displaying the data, and the Controller is responsible for controlling the flow of data between the Model and the View.
2. Model-View-ViewModel (MVVM) pattern: MVVM is another popular design pattern that separates the code into three main components: Model, View, and ViewModel. The ViewModel acts as a mediator between the View and the Model, providing the necessary data and logic to the View for display.
3. Delegation pattern: The Delegation pattern is used to allow one object to communicate with another object. In iOS Swift, this pattern is used frequently for event handling and to establish communication between a View and a Controller.
4. Observer pattern: The Observer pattern is used to establish a one-to-many relationship between objects, where the state changes of one object trigger updates in the other objects that are observing it. This pattern is commonly used in iOS Swift for handling events and notifications.
5. Singleton pattern: The Singleton pattern is used to ensure that only one instance of a class exists in the application. This pattern is commonly used in iOS Swift for managing shared resources, such as network connections or database access.
6. Factory pattern: The Factory pattern is used to create objects without specifying their exact class. This pattern is commonly used in iOS Swift to create UI elements dynamically at runtime.

These are just some of the commonly used design patterns in iOS Swift, and there are many others available as well. The choice of design pattern largely depends on the specific requirements of the project, the architecture of the application, and the development team's preferences and expertise.

Follow the SOLID principles: This set of principles can help you write code that is modular, maintainable, and scalable. SOLID stands for Single Responsibility, Open/Closed, Liskov Substitution, Interface Segregation, and Dependency Inversion. By following these principles, you can create code that is easier to understand, test, and modify.

Certainly, here's an example of how you could use SOLID principles in a Swift app:

Let's say you're building a weather app that displays the current weather for a user's location. Here's how you could use the SOLID principles to build a modular and maintainable app:

1. Single Responsi
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