Protocol Oriented Programming in Swift 4 and iOS 11

We will do a quick review of Class in object oriented programming. 

A refresher of object inheritance since we will be reviewing Protocol inheritance in the upcoming lecture. 

A quick review of what Struct can and cannot do in Swift. 

If you understand the following types of object initializers, you may skip this lecture:

• Designated
• Convenience
• Failable

An overview of Protocol creation and declaration. 

A good understanding of property declaration in Protocol may lead to how the objects adopting the protocol initialize the instances. 

The type of objects that will be adopting the Protocol could affect the method signatures of the Protocol itself. 

Protocol may declare the signature of the object initializers. Find out what is the difference with a typical objects initializer. 

Protocol extension can help in addressing the common implementation  that can be shared among objects instances adopting the Protocol. 

Learn how Protocol can inherit the properties and methods from other Protocol, also how this inheritance can help addressing Struct limitation in "object inheritance" model. 

Protocol may have optional properties and functions, how do we declare them?

Learn the pitfalls of using optional properties and functions in Protocol and how to avoid them. 

Find out how Protocol can be used as a type on objects' property declaration and its usage. 

How to detect if an object is an instance or adopting a certain Protocol thus dictating the behavior of the object itself?

Objects can adopt to multiple Protocols, which may affect how the instances of the object being passed around as parameters to functions.

Simplify how multiple Protocols declaration is being passed around.

Protocol - Delegate pattern is one of the most common pattern used to pass data around between view controllers.