Singleton vs Dependency Injection in Swift

When developing iOS apps, organizing code through "manager" classes that handle specific functionalities such as REST API, WebSockets, and notifications is common, often utilizing the Facade pattern. This pattern is typically implemented using either the Singleton or Dependency Injection patterns, each with its advantages and limitations. The Singleton pattern's main benefit is its simplicity and ease of access, allowing a single shared instance throughout the app, though it can complicate testing and scalability as the app grows. On the other hand, Dependency Injection offers more flexibility and testability by allowing multiple instances and restricting access to specific components, but it can require more initial setup and potentially complicate the development process. Both patterns have their uses, and the choice between them should be guided by the specific needs of the project, with an emphasis on maintaining single-purpose classes to prevent overcomplexity.