There are many design patterns used in mobile app development, but some of the most common ones are:
- Model-View-Controller (MVC) pattern: This pattern separates the app into three parts: the model (data and business logic), the view (user interface), and the controller (mediates between the model and view).
- Model-View-ViewModel (MVVM) pattern: This pattern is similar to MVC but separates the view and model using a mediator called the view model. The view model provides an interface to the view and exposes properties and commands that the view can bind to.
- Singleton pattern: This pattern ensures that only one instance of a class is created and provides a global point of access to that instance.
- Observer pattern: This pattern is used when one object (the subject) wants to notify a set of other objects (the observers) when its state changes. This is often used in user interfaces to update the view when the underlying data changes.
- Decorator pattern: This pattern allows behavior to be added to an individual object, either statically or dynamically, without affecting the behavior of other objects from the same class.
- Adapter pattern: This pattern converts the interface of a class into another interface that the client expects. This is often used to adapt third-party libraries to the needs of an app.
- Facade pattern: This pattern provides a simplified interface to a larger body of code, hiding its complexity and making it easier to use.