Data Flow in a SwiftUI App

Рет қаралды 52,809

Күн бұрын

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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Пікірлер: 147

@Stefan-xm9qb Күн бұрын

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.

@Stefan-xm9qb Күн бұрын

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.

@F34R303 2 ай бұрын

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!

@shrutisharma3341 2 жыл бұрын

This video deserved so many more likes. This literally cleared out all of my data flow confusions with swift UI! Thanks a ton!!

@CodeWithChris 2 жыл бұрын

Ahhhh, thank you so so much! Makes all the hard work so worth it. :) -Arthur

@ammarmujib Жыл бұрын

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.

@CodeWithChris Жыл бұрын

You're welcome! - Pat

@susantasahoo4702 2 жыл бұрын

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.

@CodeWithChris 2 жыл бұрын

Glad to hear this, Susanta! Thanks for learning with us! -Arthur

@nindz9272 2 жыл бұрын

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.

@CodeWithChris 2 жыл бұрын

Glad you found us. We're so excited for you! :) -Arthur

@JacobSucksAtCode Жыл бұрын

Dude your walkthroughs are so good. Super thorough, relaxing and information filled!

@CodeWithChris Жыл бұрын

Glad you like them! - Pat

@SebastienBarrau Жыл бұрын

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!

@CodeWithChris Жыл бұрын

Thank you so much for the kind words! :) - Pat

@armaanr1656 2 жыл бұрын

This cleared up all of my confusions. Best tutorial on youtube. Keep it up Chris🙂!

@CodeWithChris 2 жыл бұрын

This comment made our day. Thanks for learning with us! -Arthur

@nzbszb Жыл бұрын

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.

@CodeWithChris Жыл бұрын

Thank you for the kind words! We do our best to explain as simply as possible. @AdrienVillez

@andriybelizky9318 6 ай бұрын

Great video - I love it how it shows different scenarios and various tools used to solve issues

@jamesclavel25 Жыл бұрын

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.

@CodeWithChris Жыл бұрын

Thank you for the kind words! - Pat

@joeybodnar 2 жыл бұрын

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.

@CodeWithChris 2 жыл бұрын

Aaaaah, your comment made our day. Thank you for learning with us! Your support means a lot! :) -Arthur

@user-om1ze4mi7u 2 жыл бұрын

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.

@CodeWithChris 2 жыл бұрын

Thank you for the kind words! Time for Chris to make a meditation app and to tell us to breathe, breathe, relax, breathe! @AdrienVillez

@codingkim5714 2 жыл бұрын

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!

@CodeWithChris 2 жыл бұрын

So kind of you! Thank you so so much! -Arthur

@arkemal Жыл бұрын

Man, your explanations are excellent. Thank you for this!

@CodeWithChris Жыл бұрын

You're welcome!!! - Pat

@zlatkoiliev8927 Жыл бұрын

I finally managed to understand them all! Thank you so much for this tutorial Chris! You are awesome! :)

@CodeWithChris Жыл бұрын

We're happy to help! And thanks for watching! :) - Pat

@alvarovs89 2 жыл бұрын

Amazing, very well explained! thank you Chris!

@CodeWithChris 2 жыл бұрын

You're more than welcome, Alvaro! :) -Arthur

@PierluigiLuceri 11 ай бұрын

thanks a lot, this is the best video about data flow in swiftui, great job

@mario_luis_dev 4 ай бұрын

masterful explanation Chris! 👏

@GamingSucks 2 жыл бұрын

What an incredibly clear explanation. The examples really bring it together. Quite possibly the best I have seen on KZfaq!

@CodeWithChris 2 жыл бұрын

Aaaaah, our team appreciates your support, Rick! Thank you for your very kind comment! :) -Arthur

@georgh.9814 2 жыл бұрын

Thank you so much! Exactly what i was searching for and so well descriped!.

@CodeWithChris 2 жыл бұрын

You are so welcome! :) -Arthur

@DaveJacobseniOS 2 жыл бұрын

Such quality explanations. Thank you as always!

@CodeWithChris 2 жыл бұрын

Great to know this. Thank you for the kind words! -Arthur

@3VAU Жыл бұрын

Very nice and down to earth ;) thank you!

@jbare777 2 жыл бұрын

Thank you for this video, it was excellent. Liked and favorited!

@CodeWithChris 2 жыл бұрын

Wow, you're just the best. We sincerely appreciate your support! :) -Arthur

@KimbrellBrad 2 жыл бұрын

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!

@CodeWithChris 2 жыл бұрын

Thanks for your lovely feedback, Madd! Means a lot! -Arthur

@ninumedia 2 жыл бұрын

Fantastic and clear explanation, thank you so much!

@CodeWithChris 2 жыл бұрын

This comment made our day. Thank you so much, Nirdhar! :) -Arthur

@LTNKidd 2 жыл бұрын

Very clear walk through, thanks Chris!

@CodeWithChris 2 жыл бұрын

Appreciate it, thank you! -Arthur

@akshaykumar-qj2kx Жыл бұрын

You are awesome teacher Chris :) Thank you for the valuable information.

@CodeWithChris Жыл бұрын

That means a lot! :) Thank you so much! - Pat

@semilife 2 жыл бұрын

Thanks so much Chris as ever clear. Understand this clearly now.

@CodeWithChris 2 жыл бұрын

Awesome, happy to know that we helped you! :) -Arthur

@santoshlohar152 10 ай бұрын

Dude you explained in easy way..thanks.

@himanshukesharwani5333 Жыл бұрын

Sir, this really helps me to understand concepts. Thank you for such a good video :)

@CodeWithChris Жыл бұрын

You're welcome! :) - Pat

@DJFabisLP 2 жыл бұрын

Wow, pretty informative and interesting! Thank you

@CodeWithChris 2 жыл бұрын

Anytime! Thanks for learning with us! :) -Arthur

@balazskepli9471 9 ай бұрын

Very good summary on data flow! Thank you!

@CodeWithChris 9 ай бұрын

Glad it was helpful! Thanks for learning with us! - Iñaki

@ClintonSiegel 2 жыл бұрын

Very helpful! Thank you!

@CodeWithChris 2 жыл бұрын

Thanks for watching! - Pat

@uocnguyen5431 Жыл бұрын

Great Tutorial, thanks for this!

@CodeWithChris Жыл бұрын

You're welcome! - Pat

@TheEmperorXavier 8 ай бұрын

Your content is amazing

@michellemorgan6986 2 жыл бұрын

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)

@CodeWithChris 2 жыл бұрын

This made our day. Thanks for learning with us! -Arthur

@ThanhNguyen-jk5tn 2 жыл бұрын

It's really helpful. Thanks!

@CodeWithChris 2 жыл бұрын

Glad to know, thanks for learning with us! -Arthur

@sheetalshinde17 Жыл бұрын

Thanks!!...Very well explained with example..

@CodeWithChris Жыл бұрын

Glad you liked it - Pat

@40_pravalgautam15 8 ай бұрын

You made it easy to understand

@yshlnhn 2 жыл бұрын

Thanks a lot that makes me understand well about data flow

@CodeWithChris 2 жыл бұрын

So glad it helped! - Pat

@williamwildsmith5162 2 жыл бұрын

Great job Chris!

@CodeWithChris 2 жыл бұрын

Thanks for your kind words, William! -Arthur

@huyle2838 2 жыл бұрын

This is an awesome video. I feel so lucky to have access to this youtube channel.

@CodeWithChris 2 жыл бұрын

Indeed! Thanks for learning with us! -Arthur

@hakeemdeggs9117 11 ай бұрын

Amazing!!!!!!

@sathriyansam727 2 жыл бұрын

Wow super you just made my Sunday productive......👍🏻👍🏻🙂

@CodeWithChris 2 жыл бұрын

We're glad that you found us, Sathriyan! :) -Arthur

@thompsonms9941 9 ай бұрын

Good explanation bro ! Thanks !

@CodeWithChris 9 ай бұрын

Glad it was helpful! Thanks for watching! - Iñaki

@nojarhead Жыл бұрын

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

@CodeWithChris Жыл бұрын

Thanks for sharing these! - Pat

@salmahassan8689 2 жыл бұрын

Great Video .. Thanks :)

@CodeWithChris 2 жыл бұрын

You are so welcome, subscribe for more! :) -Arthur

@gpinto52 Жыл бұрын

excellent review

@CodeWithChris Жыл бұрын

Thank you so much! - Pat

@hugge0948 Жыл бұрын

Such a good tutorial

@CodeWithChris Жыл бұрын

Thank you so much! Cheers! - Pat

@weilingwang8331 Жыл бұрын

Thanks!

@CodeWithChris Жыл бұрын

No problem! - Pat

@alonavall08 Жыл бұрын

Wow thanks for this video now I understand...

@CodeWithChris Жыл бұрын

You're welcome! - Pat

@kal5211 Жыл бұрын

My man 👍

@srome0711 Жыл бұрын

Great video

@CodeWithChris Жыл бұрын

Glad you enjoyed it! - Pat

@petermartins2772 11 ай бұрын

You're the the best

@volimpia 2 жыл бұрын

Thank you

@CodeWithChris 2 жыл бұрын

Anytime. Thanks for being here! :) -Arthur

@SomwangIssaramala Жыл бұрын

Thank

@madoussfofana6045 Жыл бұрын

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.

@dangerwang 2 жыл бұрын

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?

@CodeWithChris 2 жыл бұрын

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

@nijeecooper621 2 жыл бұрын

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?

@CodeWithChris 2 жыл бұрын

Appreciate your support. Kindly post your idea here: app.productstash.io/codewithchris#/ideas Thank you! -Arthur

@janstepnicka6553 11 ай бұрын

Hello, thanks for your work. At 17:17 shouldn't the first line be @ObservedObject var myObj = MyObject() ?

@MiChElnumber4 2 жыл бұрын

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?

@CodeWithChris 2 жыл бұрын

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

@shroomadelics 2 жыл бұрын

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 ^^

@CodeWithChris 2 жыл бұрын

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

@user-vf2qm6ui5r 11 ай бұрын

I would KILL for you to teach Java, you're leagues better than my college professor.

@CodeWithChris 11 ай бұрын

Thanks for watching! I'll be sure to let Chris know :) - Iñaki

@kevinvelasco1715 Жыл бұрын

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.

@CodeWithChris Жыл бұрын

We suggest posting on our CodeCrew forum so that our tech support staff can help you. Just visit this link codecrew.codewithchris.com - Pat

@nagarajvrao7249 2 жыл бұрын

Plz include StateObject... In the follow up video

@CodeWithChris 2 жыл бұрын

Thanks for watching! :) -Arthur

@rapier64 2 жыл бұрын

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🙂

@CodeWithChris 2 жыл бұрын

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

@stephaniewagstaff6563 Жыл бұрын

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.

@matthewjura3377 6 ай бұрын

still great two years later

@CodeWithChris 6 ай бұрын

Glad it was helpful! Thanks for learning with us! - Iñaki

@alinamarrygeorge2630 2 жыл бұрын

good

@CodeWithChris 2 жыл бұрын

Thanks, Alina! :) -Arthur

@nindz9272 2 жыл бұрын

A small typo in the slide on ~17:12. It should be "ObservedObject" instead of "ObservableObject" (although you said it correctly :D)

@CodeWithChris 2 жыл бұрын

Oh, thanks for catching that! :) -Arthur

@02244 Жыл бұрын

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?

@CodeWithChris Жыл бұрын

We suggest posting on our CodeCrew forum so that our tech support staff can help you. Just visit this link codecrew.codewithchris.com - Pat

@sabalkatuwal8162 Жыл бұрын

👍

@suchcodemuchwow Жыл бұрын

How do you reformat the code ?

@CodeWithChris Жыл бұрын

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

@rambabuguttula1500 2 жыл бұрын

How can download the code with Chris phone or laptop and koputer

@CodeWithChris 2 жыл бұрын

Can you clarify your question? -Arthur

@joshuapaulhawthorne 2 жыл бұрын

What is a “View”

@CodeWithChris 2 жыл бұрын

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