An example of spinning a wheel that grants prizes in Unity 3D 2018.4.12f1. It's a complete project that should compile out-of-the-box.

Features:

• Custom inspector for easily adding/removing wheel items
• Can spin either clockwise or counterclockwise
• Animations can be tweaked in the inspector
• Simulates 1000 spins and displays the results in the console
• Winning item properties can be plugged into API of your choice (this example just adds the item's value to a text mesh's value)

An example of the wheel in action:
Example showing simulated spins: