The app we will be working with, which is hosted on a GitHub repository.The app we will be working on is very simple, so you will only need an understanding of the syntax and how to debug. ![]() A general understanding of the Swift language.Xcode 8.3 or later this is the IDE used to build iOS apps.The app also persists the data so that you still maintain the state of the app (number of items, item done or not) after it goes to the background. It can create a to-do activity, delete a to-do activity, and mark an activity as done. The app has all the basic functionalities that will show the patterns. In order to understand the MVC and MVVM design patterns, we will be building a to-do app. We will learn how to use one common iOS pattern, MVVM, in this post. Imagine how much more difficult it will be for someone who did not write the code to navigate it. When you go back to debug, it may be hard to figure out where some things are and why you even did them in the first place. Say you solve a problem without any particular design, and at the moment, it works. Why use design patterns? We use them because design patterns are typically easier to reuse and debug than an unproven design. In this post, we’ll be concentrating on MVVM and MVC. ![]() ![]() Other common design patterns include MVP (Model-view-presenter) and VIPER ( here is a little write up that describes them). If you’ve built a product, you’ve probably built using MVC. While MVC is a very common and easy-to-implement design pattern, it has been faulted as very inefficient while working with large code bases. MVVM (Model-View-Viewmodel) and MVC (Model-View-Controller) are both design patterns. Design patterns are reusable solutions to common problems in code.
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