SwiftUI Tutorial: How to make a API call, fetch JSON, and structure you networking layer with MVVM

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In this tutorial, we are going to fetch JSON data from an API and show it in a list view in SwiftUI. I will discuss how I structure my code base with MVVM (Model - View Model - View). Also I am including an extra layer for the networking logic because it helps make my code more reusable and write unit tests. You will also learn about error handling with URLSession and how to show error information to the user.

😻 The example API is the cat API.

Overview
00:00 Introduction
02:52 project organisation with MVVM
15:05 error handling, custom error type
19:03 Separate networking layer and error handling
28:44 loading view
29:48 error view
33:08 breed list views with AsyncImage
41:18 searchable view modifier to search by breed name
43:11 cat breed detail view
47:11 unit tests, mock service and dependency injection
54:29 Wrap up

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#SwiftUI #networking #JSONParsing #API

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Комментарии

Thank you, Karin! This was a tremendously useful tutorial, even a couple years later.
It would be great to see an updated version that uses async/await.

StephenRouse-ttpr

Thank you, thank you, thank you. I was unable to put a structure to making properly designed project containing API calls. This was a savior.

ekadam

I like the way you teach. First you're doing it then you are reforming the code. Thanks Karin.

burakcankurtarr

It's amazing how many skills and how many aspects are covered in one tutorial under 1 hour comparing with other ones that show just one thing in more than 1 hour. Well done!

milanfdl

Great video. I think you're my favorite Swift teacher. This is the kinda stuff pro-coders wanna watch. It's "for beginners", but it goes so much more in-depth while making sense, than other Swift Youtubers. Glad you're making videos. Greatly appreciate the unit test chapters too.

guitaripod

Absolutely the best ios tutorials on youtube, look forward to your next course

rDivaDuck

All your videos are very helpful, I have never seen a detailed tutorial like yours. Thank you.

mochamadnurkhayalkadafi

Informative, clear, quality...

Positive feedback:
As an android developer with couple of years of experience, I think this is the most straight-forward video for people like me who is interested in learning how to do things on iOS that you do on Android.
I loved how it is easy to understand (kind of beginner level) but also cares about industry level stuff such as architecture, testability (using protocols)
I literally can't wait to discover your other videos.

Neutral feedback:
I would like to hear a bit information about iOS specific stuff while you're using them. For example, in a part you say "we should probably use guard let" but I don't know the difference. And I know it's not in the context of this video, that's why I mention this as a neutral feedback and not as a negative one. It would just be more delightful for people like me.

But overall, great content, Karin. Thank you

denizbutandroid

Great video, exactly what I'm looking for. Step by step instruction of how to build a real world production ready list to detail app, with unit tests. This video doesn't cover basics of Swift and SwiftUI so learn those knowledge before watching this. Really appreciate your effort!

daixiangli

Thank you so much for the detailed explanation. Helped me understand a lot as a beginner in Swift UI.

shrinidhishetty

Fantastic tutorial! I learned so much in an hour! Thank you! ❤

teaberry

Best tutorial I've found on youtube, thank you!

ruzev

Lots of great thinking, here, for architecture, testing, etc. Thank you!

stevebarron

So happy I found your channel, most of the channels present simple stuff, that are nice. However once the project grows it gets harder to separate the stuff correctly and most of the videos just leave it ...

slavihinkov