What is the role of a User Interface (UI) in an app? It covers what the end-user of an application is going to see and be able to do.
A UI not only defines the elements that can be seen, but it also defines some of the basic interactions in the app, such as a clickable button or a dialog that appears on top of other content.
No-code development environments are typically equipped with a set of tools for creating a UI – ways to define sets of different views for different parts of an application, the navigation, and drag-and-drop components to represent everything from text paragraphs to buttons.
Every part of the UI in the Barcode Scanner Mobile App that you are building needs to be represented by a component. This includes all the buttons, text, images, icons, and so on.