What is the difference between enumerations with fixed values and enumerations using references or indirect values?

In iOS, enumerations (enums) can be of two main types:

1. Raw Value Enums — each element is assigned a specific fixed value (e.g., Int, String). These values are known at compile time and are used for convenient data storage and transfer.

Example:

enum Direction: Int {
    case north = 1
    case south = 2
    case east = 3
    case west = 4
}

2. Associated Values Enums — each case can store additional data of different types, which are set when creating an instance. This allows storing more complex and diverse data.

Example:

enum Barcode {
    case upc(Int, Int, Int, Int)
    case qrCode(String)
}

Differences:

• Raw value enums are simple, static, used for identification.
• Associated values enums are dynamic, allowing storage of additional data inside the case.

Thus, raw value enums are suitable for simple sets of constants, while associated values enums are better for more complex data structures.