Accessing UI elements in code

All the UI elements can be accessed and manipulated in code similar to other GameObjects. To access a UI element in code, you must include the UnityEngine.UI namespace and the correct variable type.

UnityEngine.UI namespace

A namespace is a collection of classes. When you include a namespace in your class, you are stating that you want to access all the variables and methods (functions) in your class. Namespaces are accessed at the top of a script with the using keyword.

By default, all new C# scripts include the System.Collections, System.Collections.Generic, and UnityEngine namespaces. To access the properties of UI elements via code, you must first use the UnityEngine.UI namespace.

Therefore...