Use design templates when developing iOS apps

Learn about the benefits of using a design template to document the characteristics of an iOS app. Also, find out which design patterns are considered fundamental for iOS development.

Every engineering discipline uses some variation of process flow diagram during the design phase of a project. This approach helps identify potential issues early enough in the project to allow engineers to make changes before construction begins. Software engineering shares the same best practices as its engineering cousins.

Design pattern

There are many advantages to using a design model to document the creative, structural and behavioral characteristics of an iOS application. Separating the user interface from the logic, for example, offers these three distinct advantages:

  • Interfaces are better defined and more specific to a device;
  • Applications adapt better to changing needs; and
  • The objects are reusable.

Separating the business layer from the presentation layer allows us to modify an iOS application more efficiently. Sometimes it is necessary to make adjustments or changes to an app to remain compatible with new versions of iOS software and new devices. It is much easier to create an iPad app from an existing iPhone project if the project was developed using design templates. If the presentation layer were independent of the main features and functions of the program, a developer could simply adjust UI components while reusing existing business logic (Figure A).

Figure A

There are many design patterns available for software developers. Following the Separation of Concerns (SoC) design principle is crucial when developing software designed to evolve. Some of the main object-oriented design patterns follow the SoC design principle by separating functionality from behavior.

Here is a short list of design patterns used by software engineers:

  • Abstract factory pattern
  • Adapter model
  • Object modeling model
  • Chain of custody model
  • Order model
  • Composite Model
  • Decorator pattern
  • Facade pattern
  • Iterator model
  • Mediator model
  • Remembrance motif
  • Model-View-Controller model
  • Observer model
  • Proxy model
  • Receptionist model
  • Singleton Model
  • Model Method Model

Design patterns are separated into three categories: creative, structural, and behavioral.

  • Creative models are specifically used to process the creation of objects. The abstract factory and the singleton are seen as models of creation.
  • Structural models are used to define object structures. Adapter, Composite, Decorator, and Proxy models are types of structural design models.
  • Behavior models identify communication between objects. Examples of behavioral design models are chain of custody, command, iterator, memento, observer, and model method.

Which design model is best suited for iOS development?

In iOS programming, leveraging a design pattern could be the difference between speed to market and launch failure. While it takes a little longer to organize requirements and distill information into blueprints for your next big iOS app, code writing time can be drastically reduced.

The Model View Controller The Design Pattern (MVC) is considered to be the basic design pattern for iOS app development. The MVC design model is not unique to iOS development; in fact, MVC was conceptualized (like a few other technologies we use today) by Xerox Parc in the 1970s.

The MVC design model consists of three parts: the model, the view, and the controller. The model contains data, information, logic, or objects considered to be part of the business layer of an iOS application. The seen contains all of the user information components, such as text boxes, buttons, and sliders, considered to be the presentation layer of an iOS app. The controller is the link, or communication layer, of an iOS application. A model will never communicate directly with a view and vice versa. The controller attaches the model to the view, handling all communications.

User actions occur on a view, such as clicking a button. The view sends the message to a controller. If necessary, the controller communicates with the model. The controller returns the information to the view. Using a hypothetical calculator app as an example, the MVC design pattern would be applied like this:

  • Model – calculation functions (add, subtract, multiply, divide).
  • Seen – user interface components (operands and operator buttons, calculation text).
  • Controller – objects that listen and communicate information to and from the model and the view. When the equal button is selected, for example, the controller requests the model to perform the calculation. The model returns the response to the controller, which quickly communicates the results to the view. The view is responsible for displaying the response. (Number B)

Number B

ios_design_patterns_FigB_101013.png

At the end of the line

The IOS App Programming Guide and that of Apple Start developing iOS apps today The tutorial recommends that every developer learn the MVC, delegation, and target action design patterns. The delegation model is based on the concept of one object acting on behalf of another, while Target-Action is a design model where an object stores information that will be sent to a specific object when a certain event occurs. product. These three design patterns are considered fundamental building blocks for the development of iOS applications.

Note: This article was originally published in November 2012 on our iOS App Builder blog.

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Abdul J. Gaspar

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