Intermediate Rest APIs - Intermediate Codable

Objectives

• You will be able to identify and use closure syntax to work with network requests and other block based APIs
• You will be able to identify, describe, and use documentation to interact with REST APIs
• You will be able to use URLSession to download and serialize network data

Required Preclass Resources

• A Short Practical Guide to Closures
• Gosh Darn Block Syntax
• Higher Order Functions - Map, Filter, Reduce
• A Beginner's Guide to HTTP and REST

  Understand HTTP requests, URLs, and the HTTP Verbs (GET, PUT, DELETE, POST). Do not build the Example Application.

• What's New in Foundation Networking

  WWDC 2014 Video

• Ray Wenderlich URLSession Tutorial
• About the URL Loading System

  Apple's documentation about the URL Loading System. Read as much as you can.

Lesson Video

Video Challenges

• Sort the Array

  Using the Playground used in the Group Demo for this objective, sort the array of people by age in ascending order.

  Map an array of ages and sort that array in descending order.

• App Icon
  • Create an URLSessionDownloadTask to get poster art
  • Display the album art on the View Controller

Stretch Problem

Making Change

Make a function that takes in a given amount of money i.e. 2.15 and returns a string of the amount of dollars, quarters, dimes, nickels, and pennies needed to make that amount of money. Return something like : Your change is 1 quarter, 2 dimes, 0 nickels, and 1 penny

♦ Black Diamond

Make a function that takes in the cost of an item, and the amount of money paid (i.e. the cost is $2.15 and the amount of money paid is $5.00) and then returns a string detailing the amount of change in dollars, quarters, dimes, nickels, and pennies.

When this works, try to recreate Swift's built-in filter function. Just like the Swift function, it should be generic and it should take a closure that returns a Bool, from which it determines how to filter your sequence type.

Hint

Solution

Guided Project

Pokedex

Pokedex lets students further practice using closure syntax, read API documentation, and make network calls using URLSession.

Project

• SubredditCodable

  Students will build an app to get the posts in a user-requested subreddit to practice asyncronous network requests, working with JSON data, Codable, closures, and intermediate table views.

  ReadMe

Mastery Review