Swift API Calls for Beginners (Networking) - Async Await & JSON
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- Опубліковано 29 чер 2024
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Learning how to write network calls as a beginner in Swift can be daunting. I remember it taking me a long time to fully grasp them. In this video I break down the basics of how network calls work and introduce you to the concept of JSON (JavaScript Object Notation).
I show you how to download data from the GitHub API with a network call and display a basic user profile page using that data. For this we use Swift Concurrency with Async Await.
This tutorial was created using Xcode 14 and iOS 16.
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#swift #softwaredeveloper #iosdeveloper
Timestamps:
0:00 - Networking in iOS Apps
0:32 - This is hard!
1:06 - What is JSON?
2:06 - Using CURL to test a response
3:39 - Open API, OAuth, API Keys - Out of Scope
4:14 - My 4 Step Process for API Calls
5:10 - Using JSON to inform your design
5:46 - Create Models from JSON
9:13 - Network Call Code
18:10 - Networking Code Review
20:02 - Using the network call
22:48 - Connecting the UI - Наука та технологія
Want to dive deeper into iOS development? Check out my iOS Dev courses (UIKit & SwiftUI) at seanallen.teachable.com
Really informative. If possible could you create a playlist for different type of network calls that you have encountered example of which are, dependent n/w call, paginations etc. And best ways to call them, such as using dispatch group etc. that would really help the Developer across globe as all the developer do make n/w all the time.
Is there any way that you can share a link to that file, especially because it's just a single file? I'm blind so I can't follow along with the video super well. I love how you explain the concepts, but there's a couple things with the symbols and stuff that I want to get my computer to read.
Coming from web world. Finally found a good creator for swift. Time to binge….
Welcome 👋. Hope you enjoy!
bot 😂
Thank you SO MUCH Sean this goes straight to the point and very informative and easy to follow the logic behind. Very very well conveyed! ❤
Thanks Ming! Glad you liked it.
I’m moving away from completion-type networks calls and I am happy that this video is out
Happy to help with this transition.
Simple, quick and streigth to the point. Love this tutorial!!
Thanks Sean! 🙏🏻
Glad you liked it!
You should keep making videos... it should be a request from whole iOS community! Kudos to you!
I coded along and it worked beautifully! Learned a lot. Wonderful introduction to async and URL session. Thank you!
9:45 Sean! I love that you talk about being confused [as a beginner] by things being all over the place in different directories/files.
That happens for me too.
This type of "compassion" is rare. So many teachers just assume, and don't have the ability-or don't care to-reach back into the past and remember what it was like to start out.
Keep doing this. It sets you apart as a teacher.
A professional writer friend of mine-who used to have an excellent podcast-said this all the time: "You're not alone." He peppered it in his writing. And often started articles that way. It was his go-to.
Why is this so important? Because ultimately people feel alone. [Most won't admit it.]
We want to belong.
To know *you* struggled at one point just like I am today? That makes me included. Like i'm not just some idiot that will never get this. It's empowering: "I got this."
Thanks again. Love learning from you (and @twostraws).
bro your twitter handle ?
and that comment was very nice of you !
Best tutorial ever for Networking and API calls in Swift UI!
yeah i have watched 20+ videos about this topic and yet this is the only video that worked for me. Thanks bud
I was the same way when I tried learning network calls. It's a tough topic. Happy to hear my video resonated with ya!
Great job. So much easier than the Obj-C.
If you haven’t, since you brought it up, you might do a pros/cons video on multiple files. I’m sure there are going to be many opinions on ‘how big is too big’ for 1 file.
Very good training video and an important training video to watch. I like how you demonstrate network calls and syncing the API data, coding the JSON, and creating a starter page all on one Xcode file. This makes it much easier to follow.
Glad it was helpful, Pat!
Thank you ! I'm learning swift as an experienced Spring/Java developer and your tutorials help me to grab the fundaments of Swift with actual functionality which is interesting to follow. Simply great & please keep up posting
Glad you like them!
I’m on the same boat as you! Spring -> Swift. Really digging everything about Swift development so far, I only wish I had jumped into this sooner!
Thanks so much. It is true - for a beginner having all the code in one place makes it easier to understand.
sean thank you soooo much, this cleared up a lot for me. i love how you progessivly recap the code it really helps me understand!
Glad it helped!
Thank you! I started out learning iOS until I went to Flutter! I’m looking to learn more Native iOS and you made this easy for me. This is pretty similar to making network calls in Flutter.
i was looking for something like this for ages, thank you
Happy to help!
I am mostly a web developer using Javascript, PHP, MySQL and Apache server and I developed my own framework using these tools. I have decided to expand my framework to handshake with Swift and Kotlin ecosystems so I can develop apps that communicate with my other framwork! This video was my starting point. !! Thanks
Great video. Covered multiple subtle but important topics. Thank you.
Glad it was helpful!
I've been doing Apps with network requests for a while, but I haven't messed around with using async await yet. This lesson will be really useful for trying to apply it in a new App I'm building. Thank you for a clear explanation as always!
Glad you liked it, David!
Good stuff Sean. Thanks much! One of the best presentations I've seen. And I've seen a lot. Thx again.
Great video. I suspect I will be saving this and watching it a couple of times. Thanks!
Glad it was helpful!
You explained this so well! Thank you for this!
Glad it was helpful!
What a video🤩 , Im very much happy to watch this video, 25 minutes goes like a minute great tutor i ever had
Glad you enjoyed it!
This is a nice and inspiring tutorial. Thanks for the video SeanAllen I will definitely watch it again.
Glad it was helpful!
Thank you so much. I didn't know that we can also use async await keywords on Swift and on networking. I was doing my all networking codes with dataTask. It gave me a new perspective. Also It's nice to see Paul here too.
Happy to show you something new!
What an amazing video!
With that I did make a small app with navigation views to check bio and followers in order to get more expertises about async api calls and screen navigations!
Thanks Sean! Keep doing these awesome videos! 😎
The best tutorial i already see ! very usefull, thanks dude !
Ur notes&teaching is very clearly... thank u
Nice! Very detailed explanation. I am a seasoned software engineer just getting my hands dirty with Swift, and all of these concepts make a lot of sense to me. Thanks.
Glad it was helpful!
Thank you! Thank you! Thank you!
Very helpful video! Much wanted!
Excellent tutorial! Thanks Sean.
Glad it was helpful!
It's the best video about network calls !!!
Glad you liked it!
Thank you Sean, I appreciate your work.
My pleasure!
Im taking the course of angela, basics of swift. And i look up for your videos to have a certain idea of what im going to see so im not fully lost haha. Thanks for sharing your knowledge
Happy to help!
Thank you for the clear video!!
Happy to help!
Great refresher..Thanks Allen
Happy to help.
Fantastic explanation.
omg this worked!!! thank you!
You're welcome!
Excellent content. Truth be told, I'm not a huge fan of excessive do { } catch blocks as they tend to make me anxious for some reason 😅. I usually lean towards using closures or creating wrappers around do/catch, maybe it's just a force of habit.
However, each new release of Swift & SwiftUI seems to be improving tremendously. I'm optimistic that they'll soon address the navigation issues - I'm aware of NavigationStack, but sadly it's only compatible with iOS16+ and I haven't had the chance to try it out yet.
A minor suggestion for this kind of videos would be to include a gist with a code in the description.
Thank you man, you are the bestest
You are a legend man
Haha, happy to help :)
Hello from Ukraine. Nice stuff! Thanks a lot for sharing your knowledge and wisdom! Keep it going! You are great!
Glad you enjoyed it!
Thanks Sean!!
OG video, Thanks for the help.
No problem!
My guy 💪🏿
Amazing explanation
Glad you liked it
Thank you for the video. I would like to know more about Network Calls. How to work with an array of users?
thank you sean!
Helpful!
This is a gold one!
Glad you enjoyed it, Abdel!
Many thanks for tackling the real world example that is the most likely bottle neck for Async Await in a workable entirety.
Happy to help!
fantastic video
Thank you! 😃
Thanks, Sean 🙏
No problem, Jerry.
My first time watching your videos with 29 comments. Thanks for new video 😅.
Thanks for watching :)
Thank you!
You bet!
The best of the best .....:)
Thanks for the kind words :)
thank you !
You're welcome!
Amazing content, was able to follow along and replicate the code. Would greatly appreciate it if there is a follow up video regarding oauth API calls to fetch and refresh access token, thanks again for the great content.
please make video about access and refresh token, Where to save in the iOS, how to call the api
I would like to see how people typically handle tests with network calls. Would there be test to see if the api your calling has changed and would you make a dummy service that mimics the api for your own tests?
cool video)
Glad you liked it!
Hey Sean, where do you make the API calls ? It seems like a lot of tutorials online show it in the view model but others say to make the call in the Model layer..
This is for MVVM architecture
Hi Sean, Out of subject can we create an xcframework with third-party dependencies like Alamofire, lottie-ios etc..
Thanks so much. It worked, but How can I edited for an array json data?
This is a very well explained video.
Do you have one that includes auth and how to save tokens using SwiftUI? Either in a video, or one of your courses?
Thanks. Glad you liked it! I don't have a video or course that covers saving tokens, unfortunately.
Hi Sean! What are your thoughts on iOS development vs QA automation? Any ideas what the future holds for iOS developers for 2024 job market is US considering all the recent massive layoffs in the big tech? Trying to make a decision here, as I think QA market is over saturated at this point... Thanks!
I was waiting for the second API call with Array json. Do u gonna make it ?
Been unemployed for 2 months and been actively looking for Swift / React native jobs but the demand is so small this year because of the no-to-low code app builders. its really frustrating pursuing ios beyond.
🔥
My brain hurts, thanks for the video!
You're welcome
As an flutter developer swift is amazing
Hi! I really like your videos! You are my iOS university so thanks. Could you make a video about the same thing but using Alamofire? Thank you.
Glad you like my content! I haven't used Alamofire since 2016. Unfortunately, I'm not familiar with it anymore.
@@seanallen don’t worry Sean! Thank you so much for responding to me. Never stop please, I’m from Spain but you are literally the best teacher.
awesome
Glad it was helpful!
Hey Sean, great video as always!
As an experienced developer wanna ask you - do you think it's okay to use classic Result in closure way of network request instead of async/await in new UIKit based apps?
I tried to use async/aways and it didn't feel much better, still need to wrap this code in Task, call it with and expect response asynchronously. What do you think?
Due to i currently making new app from scratch, and still feeling unease cause i use UIKit :D
And not using async/await is making me feel like those ObjC devs i was looking at when i started iOS 5 years ago
My opinion is that it's perfectly fine to use the classic closure based way of doing network calls. Async/Await has its benefits and is more "modern". But at the end of the day... as long as your code works and the codebase is easy to read and work in.. you're all good as far as I'm concerned.
Do you know how to get the redirect url when getting status code 301? I need to add query items to the new url. Thanks :)
What is the best way to handle null responses from the server? my bio was null and it failed to parse the data.
Great sir please make more video on api using uikit
I tried to recreate this exactly as done in the video to test myself. I can only get it to show the placeholders. It won't pull up any user info? Any ideas why?
i get so many errors in swift since it works so differantly from other programming languages. what is the best method to debug? for example when a FOREACH accepts arrays and i where to print that 0..
Could async await be used with uikit too?
hi i want to ask something, i already have APIService, model data and already call API like image, text to UI but i need to call link from API with hyperlink text. like example a text (Read more) clickable but the link from API, how to call it?
Maybe I'll start playing with async await now.
Let me know what you think!
FYI... When I tried using my own account url, ending in "avantjer", the app was showing only placeholders for all three fields (but no errors).
I discovered that I had no "bio" on GitHub. ("bio": null)
Once I added a bio to my GitHub account, everything worked fine.
Interesting that I wasn't at least shown my login, and avatar, even though I had no bio.
Maybe Codable "silently" failed because "bio" was null?
The code can be updated to handle cases in which the user has no bio.
Just make "bio" an optional
struct GitHubUser: Codable {
let login: String
let avatarUrl: String
let bio: String?
}
how to fix "Function declares an opaque return type, but has no return statements in its body from which to infer an underlying type" i create exactly like video but got this one error, already google it cant really found the solution.
how can i use this for an array of users?
Literally I watch your videos the past week and realized I wasn't subscribed. Shame on me!
Does someone know why is try not in a docatch block at : 12:09
is there any difference between doing in swift ui or core swift
SwiftUI is a user interface framework. Swift is a programming language.
It fails for me and I get invalid data error code., but a return of 1385 bytes My raw data has twostraws's data response, i can read clearly but my code fails
EDIT: The problem was my struct GitHubUser had avatar_url rather than avatarUrl
How would you persist the downloaded JSON data using SwiftData?
I haven't worked with SwiftData yet, but this is a larger topic that would require another video. Can't be answered in a comment.
its ok. I understand. but i try to use a JSON from Woocommerce. ( products, price, description ) but not working. i dont know whats the problem
maybe it's what he mentioned on the start (auth)?
did you solved your problem?
I want the same tutorial for swift not SwiftUI 🥺
All the network logic is plain swift.
Thanks for sharing
Happy to help, Rahul.
Good work
Thanks!
Hi Sean, Thanks for the video!
Question: Why don't you need to wrap this line in a "do catch" ?
let (data, response) = try await URLSession.shared.data(from:url)
Great video! How would you handle passing request states like “loading” back to the UI? This variable will change a couple of times during the process so you couldn’t just pass it back as a return from your request, so just curious how you would handle it.
I guess you could just add it before and after the await call 🤔. That would work I think.
Yeah, that's how it's typically handled. I usually use something like an "isLoading" boolean that gets flipped to true right before the API call, and then flipped back to false when the API call returns.
@@seanallen I ended up doing this and adding a activity progress view to my button. It came out great! Thank you!
What is the difference between the URLSession.shared.data() vs URLSession.shared.dataTask()?
with data(), you will get data and response in tuple or individual if need, whereas with .dataTask you will get data, response and error to be handled and return is task which need to be resume like task.resume().
It's also the difference between the old closure based way of doing network calls and using Swift Concurrency and async await.
So if you have more complex json and more customization use dataTask() ?
I was so shook when you just wrote this code out and basically didn't explain any of it:
guard let response = response as? HTTPURLResponse, response.statusCode == 200 else {
throw GHError.invalidResponse
}
Me writing a network call in python in 3 lines 🫣