Design Patterns by Tutorial

Question 1

What is a design pattern?

Answer 1

Reusable, template solutions to common development problems

Question 2

What are the 3 main types of design patterns?

Answer 2

1. Structural
2. Behavioral
3. Creational

Question 3

What are structural design patterns?

Answer 3

Describes how objects are composed and combined to form larger structures.

Question 4

What are some examples of structural design patterns?

Answer 4

MVC, MVVM, Facade

Question 5

What are behavioral design patterns?

Answer 5

Describes how objects communicate with each other.

Question 6

What are some examples of behavioral design patterns?

Answer 6

Delegation, Strategy, Observer

Question 7

What are creational design patterns?

Answer 7

Describes how to create or instantiate objects

Question 8

What are some examples of creational patterns?

Answer 8

Builder, Singleton, Prototype

Question 9

What are some benefits of using design patterns?

Answer 9

1. Create a common language
2. Fast-track developer onboarding
3. Allow to spot similarities between code

Question 10

MVC: What are Models?

Answer 10

hold application data. Usually structs or simple classes.

Question 11

MVC: What are Views?

Answer 11

display visual elements and controls on screen. Usually subclasses of UIView

Question 12

MVC: What are Controllers?

Answer 12

coordinate between models and views. They are usually subclasses of UIViewController.

Question 13

How does ownership and data flow through MVC?

Answer 13

The ViewController owns both the Model and View. Views pass information back through actions. Model through property observers.

Question 14

When should you use MVC?

Answer 14

Use MVC pattern as a starting point for creating iOS apps.

Question 15

What are some limitations to MVC?

Answer 15

Not every object will fit neatly into a category of M, V, or C. “Massive View Controller”