Data Flow in a SwiftUI App
ฝัง
- เผยแพร่เมื่อ 5 ส.ค. 2024
- In this lesson I want to review with you how data both plays a part in your view and also how it flows through your app across multiple views.
We’ll start with the simplest scenario and work our way to more complex scenarios.
You’ll see examples using state properties, bindings, observable objects, environment objects as well as other data related SwiftUI keywords such as @Published, @ObservedObject and more.
By the end, you’ll know how to pass data around in your SwiftUI app!
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Timestamps:
00:00 Introduction
00:57 SwiftUI State Properties
03:20 State Properties Recap
03:38 SwiftUI Bindings
04:10 $Binding Example
06:51 $Bindings Recap
07:05 @Binding Example
14:42 $Binding and @Binding Recap
15:15 SwiftUI State and Bindings Recap
15:45 SwiftUI ObservableObjects
17:31 ObservableObject Example
22:55 ObservableObject Recap
26:33 SwiftUI EnvironmentObject
28:07 EnvironmentObject Example
30:28 EnvironmentObject Recap
32:39 Outro
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Hi I’m Chris! I’m dedicated to teaching fundamentals about how to make an app. This is important if you’re trying to land an iOS job, be a freelancer, increase or start a business with an app idea. On this channel and my website, you'll find a ton of free resources and tutorials to aid you on your journey to learn iOS development. Many people have learned to code and build apps on their own! cwc.to/reviews
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I started watching your videos 6 years ago when I was in high school to learn coding. Now, I've graduated college, working as a software engineer and am still learning a ton from your videos!
You explain things much better than Sean Allen. I immediately understand your videos, great job! I like how everything is from scratch and how it builds up.
For example Sean Allen start with bunch of boilerplate code and also assumes you know stuff from older swift versions which makes it difficult to understand.
Dude your walkthroughs are so good. Super thorough, relaxing and information filled!
Glad you like them! - Pat
The video seems to be 1 year old, but still masterpiece to understand data flow/proprty wrappers in SwiftUI. Thanks a lot for such simple and clear explanation.
You're welcome! - Pat
Great video - I love it how it shows different scenarios and various tools used to solve issues
This video deserved so many more likes. This literally cleared out all of my data flow confusions with swift UI! Thanks a ton!!
Ahhhh, thank you so so much! Makes all the hard work so worth it. :) -Arthur
Thank you so much for this video! Just yesterday I was googling the exact things you've described in this video. It really does help to understand how things work in SwiftUI.
Glad you found us. We're so excited for you! :) -Arthur
I took your 2 initial iOS courses 6 years about back in 2015 and been working as a professional iOS dev for 5yrs now. came back to learn swiftUI. still high quality content, nice! wish I could like this video multiple times.
Aaaaah, your comment made our day. Thank you for learning with us! Your support means a lot! :) -Arthur
masterful explanation Chris! 👏
I finally managed to understand them all! Thank you so much for this tutorial Chris! You are awesome! :)
We're happy to help! And thanks for watching! :) - Pat
thanks a lot, this is the best video about data flow in swiftui, great job
New with iOS app development and man, a lot of those property wrappers have been explained here which can easily be understood. Many thanks to you sir! Keep up the great videos - you've helped a lot of beginner devs here.
Thank you for the kind words! - Pat
Thanks for the awesome video on environmentObjects. You made it super easy to understand and I appreciate the time and effort you put into making it. Keep up the great work!
Thank you so much for the kind words! :) - Pat
Awesome video. This literally cleared out all of my data flow confusions with swift UI! Thanks a ton!! It deserves many more likes. Best video on this topic. Appreciate your effort for explaining it in nice & clean Manner.
Glad to hear this, Susanta! Thanks for learning with us! -Arthur
Very nice and down to earth ;) thank you!
Dude you explained in easy way..thanks.
This cleared up all of my confusions. Best tutorial on youtube. Keep it up Chris🙂!
This comment made our day. Thanks for learning with us! -Arthur
Thanks so much Chris as ever clear. Understand this clearly now.
Awesome, happy to know that we helped you! :) -Arthur
Such quality explanations. Thank you as always!
Great to know this. Thank you for the kind words! -Arthur
Man, your explanations are excellent. Thank you for this!
You're welcome!!! - Pat
Fantastic and clear explanation, thank you so much!
This comment made our day. Thank you so much, Nirdhar! :) -Arthur
This was a very well-done explanation! Your style of walking through each combination of wrappers and properties really cleared up much of my previous "fuzzy" understanding of these property wrappers. Thanks Chris!
Thanks for your lovely feedback, Madd! Means a lot! -Arthur
Amazing, very well explained! thank you Chris!
You're more than welcome, Alvaro! :) -Arthur
This is very detailed, simplified and well explained. Others always tried (no offence!) but failed to give good examples like this. Thanks for this treasure.
Thank you for the kind words! We do our best to explain as simply as possible.
@AdrienVillez
Very clear walk through, thanks Chris!
Appreciate it, thank you! -Arthur
This was an amazing video for developers who get stuck to understand how properties wrappers work. Besides, Your voice is so soft and your pronunciation is very clear which can mesmerize everyone. I already subscribed your channel.
Thank you for the kind words! Time for Chris to make a meditation app and to tell us to breathe, breathe, relax, breathe!
@AdrienVillez
Hi, Cris.
Thank you for uploading these about Swift. I'd beed desperate till I found your channel. I found the best videos for starting to study the Swift! Awesome!
So kind of you! Thank you so so much! -Arthur
You made it easy to understand
What an incredibly clear explanation. The examples really bring it together. Quite possibly the best I have seen on TH-cam!
Aaaaah, our team appreciates your support, Rick! Thank you for your very kind comment! :) -Arthur
You are awesome teacher Chris :) Thank you for the valuable information.
That means a lot! :) Thank you so much! - Pat
Thanks a lot that makes me understand well about data flow
So glad it helped! - Pat
Thank you for this video, it was excellent. Liked and favorited!
Wow, you're just the best. We sincerely appreciate your support! :) -Arthur
Very helpful! Thank you!
Thanks for watching! - Pat
It's really helpful. Thanks!
Glad to know, thanks for learning with us! -Arthur
Wow, pretty informative and interesting! Thank you
Anytime! Thanks for learning with us! :) -Arthur
Your content is amazing
Thank you very much for this informative video! It was definitely very clear and simple, and I now have a better understanding of this topic (which I must admit, I was having a difficult time understanding)
This made our day. Thanks for learning with us! -Arthur
Amazing!!!!!!
Thanks!!...Very well explained with example..
Glad you liked it - Pat
Very good summary on data flow! Thank you!
Glad it was helpful! Thanks for learning with us! - Iñaki
Great Tutorial, thanks for this!
You're welcome! - Pat
Sir, this really helps me to understand concepts. Thank you for such a good video :)
You're welcome! :) - Pat
Hi Chris, thanks for the excellent tutorial. Here's a couple of nuances that I've recently noticed in how @ObservedObject publishes changes and triggers redraws:
1. if your Profile class had a second @Published property that is not used in the layout code, any changes to that property would trigger a redraw of the view anyways.
2. setting the same/current value to a @Published property (e.g. isLoggedIn = true when it's already true) will trigger a redraw of the UI
3. contrary to #2, the .onChange modifier will only react to new values and won't be triggered when setting the same value over and over
Thanks for sharing these! - Pat
Great job Chris!
Thanks for your kind words, William! -Arthur
Wow super you just made my Sunday productive......👍🏻👍🏻🙂
We're glad that you found us, Sathriyan! :) -Arthur
Good explanation bro ! Thanks !
Glad it was helpful! Thanks for watching! - Iñaki
This is an awesome video. I feel so lucky to have access to this youtube channel.
Indeed! Thanks for learning with us! -Arthur
Such a good tutorial
Thank you so much! Cheers! - Pat
Wow thanks for this video now I understand...
You're welcome! - Pat
Thanks!
No problem! - Pat
excellent review
Thank you so much! - Pat
Thank you
Anytime. Thanks for being here! :) -Arthur
You're the the best
Great Video .. Thanks :)
You are so welcome, subscribe for more! :) -Arthur
My man 👍
Great video
Glad you enjoyed it! - Pat
Thank
Very very very Good explanation. Well done Chris. Tell me where do you collect those information as developper? When I read the Apple document without exemple. it's very hard to understand.
Nice explanation Arthur!
Is it possible to change an observable object in another class? I have my logic going on in a separate class and would like do make some changes in states viewable in the view file?
Hello, kindly post your question in our CodeCrew forum so that our tech support staff can assist you. Go here: codecrew.codewithchris.com. Thanks for learning with us! -Arthur
Wow, this was super helpful Chris, thanks for putting this explanation together.
Also, it sounds like you are using a custom mechanical keyboard, or maybe I'm wrong. What keyboard are you using?
Hi, Kevin! Thanks for your kind support! Kindly send an email to care@codewithchris.com so I can give you more info! The links are too long to share here, haha. :) -Arthur
Hey Chris! Love the videos! I’m new to apps. Anyway you could make a series on how to make a app like Tik tok that let’s the users upload their videos?
Appreciate your support. Kindly post your idea here: app.productstash.io/codewithchris#/ideas Thank you! -Arthur
Woow such great Tutorials. I already have done the Cardgame App 😊
How do you proceed, if for whatever reason you want to create twice instances of Profile and use it with the property wrapper "EnvironmentObejct"?
Would you have to create a constant for each instance (ex.: myProf1 = Profile () ) and then call the two references with the modifier EvnironmentObject?
English is not my native language, hope you understood it anyway ^^
Hello, kindly post your question in our CodeCrew forum so that our technical support staff can assist you. Go here: codecrew.codewithchris.com/ Thank you! -Arthur
I saw the video, great explanation, but I so simple, I'd like to know what happens if you need more than 1 enviormentObject. For instance, we have a model Company and model User that models are used in many parts of the app what is the correct way to pass 2 enviormentsObject and reuse that 2 models executed one time the user init session.
We suggest posting on our CodeCrew forum so that our tech support staff can help you. Just visit this link codecrew.codewithchris.com - Pat
How would I get what the user types in TextField over to another view. I can't seem to get use the property its held in to do so? Thank you.
Hello, thanks for your work. At 17:17 shouldn't the first line be @ObservedObject var myObj = MyObject() ?
still great two years later
Glad it was helpful! Thanks for learning with us! - Iñaki
I would KILL for you to teach Java, you're leagues better than my college professor.
Thanks for watching! I'll be sure to let Chris know :) - Iñaki
Hi Chris! I like your tutorials and I learnt a lot. But there is one more thing. I would like to integrate a print function for the AirPrint (SwiftUI). But unfortunately, I couldn't find any tutorials for this topic. Is it possible to integrate a printing function for SwiftUI at all? If yes, where could I find these information/tutorial? Thanks a lot. Peter🙂
Hello, kindly post this question in our tech support forum so that our tech support staff can assist you. Go here: codecrew.codewithchris.com. Thank you! -Arthur
Plz include StateObject... In the follow up video
Thanks for watching! :) -Arthur
What if I want to use 2 EnvironmentObjects of the same type? How do I specify the exact name of the variable in the root View?
We suggest posting on our CodeCrew forum so that our tech support staff can help you. Just visit this link codecrew.codewithchris.com - Pat
A small typo in the slide on ~17:12. It should be "ObservedObject" instead of "ObservableObject" (although you said it correctly :D)
Oh, thanks for catching that! :) -Arthur
How do you reformat the code ?
Hi! We suggest posting your question on our CodeCrew forum. Our tech support staff will help you out. Just visit this link codecrew.codewithchris.com - Pat
good
Thanks, Alina! :) -Arthur
👍
How can download the code with Chris phone or laptop and koputer
Can you clarify your question? -Arthur
What is a “View”
Hello, thanks for your kind words! Best if you post your question in our CodeCrew forum so that our tech support staff can guide you. Go here: codecrew.codewithchris.com. Thanks for learning with us! -Arthur
You do a perfect job. But there is no way I can learn all from you. Need some more structure. Especially missing coredata.
You can get started here codewithchris.com/start :) - Pat
At 17:17 you say @ObservedObject but the slide shows @ObservableObject. But man am I loving these breakdowns. Watching it right before an exam😅
🙈🤫 - just to make sure you were paying attention!
@AdrienVillez