You cannot apply Banner pattern at shield, or enchant it, unlike Java.
How to reproduce:
-Apply Banner Pattern at Shield
Step 1: Go to Crafting Table
Step 2: Apply banner and Shield just like in Java
It do not make a patterned shield
-Enchant Shield
Step 1: Go to Enchanting Table/Anvil
Step 2: Put a shield at the enchanting GUI (Also put a Enchanted book such as protection if you are using Anvil)
It cannot enchanted