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Building a Weather Application From Scratch

Parsing the JSON Response

by Bart Jacobs | Jun 26, 2018 | Swift

Swift 4 Xcode 9 iOS 11

Building a Weather Application From Scratch

1	Introduction 03:30
2	Setting Up the Project Plus 07:15
3	View Controller Containment Plus 12:08
4	Fetching Weather Data 05:59
5	Removing Object Literals Plus 07:54
6	Creating a View Model Plus 13:09
7	Parsing the JSON Response Plus 13:56
8	Handling Errors and Notifying the User Plus 14:28
9	Adding Flexibility With Protocols Plus 14:11
10	Creating the Day and Week View Models Plus 07:33
11	Creating the User Interface of the Day View Controller Plus 12:52
12	Organizing Fonts and Colors Plus 06:45
13	Implementing the Day View Model 15:55
14	Writing Unit Tests for the Day View Model Plus 12:57
15	Implementing the Week View Model Plus 12:37
16	Writing Unit Tests for the Week View Model Plus 07:10
17	Fetching Weather Data for the User's Location Plus 13:32
18	Increasing Testability With Protocol-Oriented Programming 14:47
19	Replacing Optionals with Enums and Associated Values Plus 09:30
20	Efficiently Refreshing Weather Data Plus 08:48
21	Adding Pull to Refresh Plus 09:40
22	Unit Testing With Mock Objects Plus 10:49
23	Unit Testing Asynchronous Code Plus 06:40
24	Mocking Network Requests Plus 08:28
25	Exposing Gaps in the Test Suite Plus 04:00
26	Filling In the Gaps of the Test Suite Plus 13:16
27	Mocking Network Requests With Mockingjay 07:48

In the early days of Swift, working with JSON was clunky and inelegant. Most developers relied on third party libraries that simplified this tedious task. The Swift team was aware of this gap in the Swift standard library and, after focusing on the foundation of the language first, they introduced the Codable protocol in Swift 4. The Codable protocol is a powerful solution that makes working with JSON quick, easy, and intuitive.

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