SOLID Principles in iOS (Swift) — Explained with Simple Examples SOLID is a set of 5 design principles used to write clean, scalable, reusable, and maintainable code in iOS apps. These principles are very important in: UIKit SwiftUI MVVM Clean Architecture Large-scale apps S — Single Responsibility Principle (SRP) Meaning A class should have only one reason to change. A class should do only one job. ❌ Bad Example class UserManager { func fetchUser () { print ( "Fetch user from API" ) } func saveUserToDatabase () { print ( "Save user in DB" ) } func sendEmail () { print ( "Send email to user" ) } } Enter fullscreen mode Exit fullscreen mode 2. O — Open/Closed Principle (OCP) The Open/Closed Principle (OCP) states that software entities (classes, modules, and functions) should be open for extension, but closed for modification. This means you should be able to add new functionality or behaviors without altering the existing, tested source code. W* hy is OCP important?…