iOS Dev Job Interview - Must Know Topics

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Sean Allen

Sean Allen

День тому

I put together a collection of my best iOS Developer job interview topic videos to help you prepare for your interview. It's impossible to know what questions will be asked during an interview, but these topics are VERY commonly asked about:
Topics covered:
- Network Calls
- Classes vs. Structs
- Generics
- Closures
- Filter, Map, Reduce
- Array vs. Set
- Unwrapping Optionals
- Unit Tests
- Singletons
- Dependency Injection
- Delegates & Protocols (UIKit)
- View Lifecycle (UIKit)
- Concurrency & Threading
- ARC & Retain Cycles (UIKit)
My iOS Dev Courses:
seanallen.teachable.com/
Twitter:
Sean Allen - / seanallen_dev
Hired.com:
hired.com/x/1n01g
Book and learning recommendations that help out the channel if you decide to purchase (Affiliate Links):
Paul Hudson's Hacking With Swift:
gumroad.com/a/762098803
Donny Wals - Combine:
gumroad.com/a/909014131
Mark Moeyken’s SwiftUI Books:
www.bigmountainstudio.com/swiftui-views-book/fzc51
Objc.io Books (Thinking in SwiftUI & Advanced Swift):
gumroad.com/a/656585843
Timestamps:
0:00 - Network Calls
24:56 - Classes vs. Structs
31:22 - Generics
41:01 - Closures
54:31 - Filter, Map, Reduce
1:07:15 - Array vs. Set
1:15:57 - Unwrapping Optionals
1:29:18 - Unit Tests
1:45:56 - Singletons
1:50:56 - Dependency Injection
1:56:56 - Delegates & Protocols (UIKit)
2:06:47 - View Lifecycle (UIKit)
2:13:49 - Concurrency & Threading
2:21:12 - ARC & Retain Cycles (UIKit)
#swift #softwaredeveloper #iosdeveloper

КОМЕНТАРІ: 120
@seanallen
@seanallen 10 місяців тому
Go deeper and build apps with my iOS developer courses at seanallen.teachable.com
@tb45g
@tb45g 9 місяців тому
You should so some more portfolio reviews! They're super helpful, but some of your old ones are for websites that are no longer available (a couple portfolio sites are spam links now).
@JustFocus-xs1hw
@JustFocus-xs1hw 5 місяців тому
Sean, I have a big interview coming up tomorrow, and this was incredible, thank you so much! Would you be open to creating another video in a similar long-form format, that just goes through all of the available UIKit Views and ViewControllers, one-by-one going into detail with how to use them? And likewise, one for SwiftUI and each Views popular viewmodifiers, etc.? That would be super awesome to see all in sequence just like this, because then you can absorb the full context of what is available out of the box in each framework, without needing to get too lost in the docs. Thanks!
@browhocodes
@browhocodes 10 місяців тому
As a ex-Facebook iOS engineer and content creator myself, I cannot enough of your videos, man. Succinct, informative, engaging. Keep it up brother!💎
@seanallen
@seanallen 9 місяців тому
I appreciate that! Glad you enjoy the content 😀
@clintonagyemangduah2000
@clintonagyemangduah2000 9 місяців тому
Bro. Does meta use SwiftUI or Objective-c?
@browhocodes
@browhocodes 9 місяців тому
@@clintonagyemangduah2000 objective-c!
@mr__khan5251
@mr__khan5251 8 місяців тому
You are awesome man, you explain things so well.
@laurentb6563
@laurentb6563 9 місяців тому
Beautiful! just when I am starting to look for a job again! Thank you Sean! After following you for so long I totally trust your insights on this subject :)
@akankshapakhale2965
@akankshapakhale2965 9 місяців тому
Hey Sean video really helped me to understand the swift concept deeper and really appreciate your hard work for spreading knowledge
@jasonjackson55
@jasonjackson55 5 місяців тому
41:06 who are we @escaping from 😂 this made my day 😂
@samdiablo0
@samdiablo0 8 місяців тому
I have an interview coming up and this was exactly what I was looking for! Thank you for this detailed video!
@user-yd9xy3rb4x
@user-yd9xy3rb4x 7 місяців тому
Detailed???
@ejolsson
@ejolsson 6 місяців тому
Thanks Sean! Keep up the great work!
@seanallen
@seanallen 6 місяців тому
Wow, I appreciate the generosity! Thanks!
@TtnKolonyasi
@TtnKolonyasi 4 дні тому
Thanks for being a great teacher and idol Sean. Learned a lot from your vids and landed a job. Working 1+ year and its time for a change so I’m having a technical interview tomorrow for a bigger, better company. So here I am once again learning from you 😁
@seanallen
@seanallen 2 дні тому
I appreciate the kind words :). Best of luck in the interview!
@wizard19900509
@wizard19900509 3 місяці тому
Great video! I used this to refresh myself before an iOS interview. One small issue I found is that the the delegate part, you didn't add weak to the delegate example. This could lead to reference cycle in classes (super easy mistake for beginners).
@user-pu3gk1sy7r
@user-pu3gk1sy7r Місяць тому
I am glad I found this video in my life! The explanation of all the network calls async & away in one file was the peak! I watched numerous videos with different folders for each of them but the way you explained in on file I was able to understand after a long time.
@seanallen
@seanallen Місяць тому
Happy to hear it was helpful and you finally understood those network calls!
@jasongoodrow949
@jasongoodrow949 3 місяці тому
This is excellent! Just getting my feet wet and had figured out a bunch by typing but this vid really summed up and explained really clearly and efficiently. Good work!
@seanallen
@seanallen 3 місяці тому
Glad it was helpful!
@binhhuynh5005
@binhhuynh5005 9 місяців тому
Nice video. I would add a bit on sync vs async in Concurrency session
@indianfyre
@indianfyre 9 місяців тому
Amazing resource right here, thanks Sean!
@seanallen
@seanallen 9 місяців тому
My pleasure!
@mateo5677
@mateo5677 Місяць тому
Sean subtlety flexing his Porsche 911 in his teachings is iconic 😅
@seanallen
@seanallen Місяць тому
😏
@dawei84_dev
@dawei84_dev 10 місяців тому
This is awesome, thank you Sean!
@seanallen
@seanallen 10 місяців тому
Hope it helps!
@sarathkumarsankar5090
@sarathkumarsankar5090 10 місяців тому
I am so grateful. thank you, Sean.
@seanallen
@seanallen 10 місяців тому
You're welcome :)
@dk-sky3820
@dk-sky3820 9 місяців тому
I cannot express enough my gratitude for this video Sean. It is all the information I read over and over in million articles before all my interviews put into one concise video with demonstration that sticks in your mind. Now I don't even need to read my saved links anymore to refresh my mind. This video helped me so much before the interview today. I don't know the results yet but I already felt so much better during it because of the confidence this information gave me. Thank you!
@seanallen
@seanallen 9 місяців тому
Great timing then. Best of luck on the interview!
@favoritetroll9774
@favoritetroll9774 20 годин тому
share your saved links just in case it can be useful to others like me etc
@hao-bz
@hao-bz 9 місяців тому
super helpful stuff!!!
@theiosdeveloper555
@theiosdeveloper555 9 місяців тому
great video, thanks for sharing!!
@tommytexter4054
@tommytexter4054 7 місяців тому
I am having a iOS dev interview next Monday. I have been watching your videos this entire weekend! Hope I can do great tmr !🎉
@seanallen
@seanallen 7 місяців тому
Best of luck! Let me know how it goes.
@shubham-itachi
@shubham-itachi 5 місяців тому
Did it go well bro
@tommytexter4054
@tommytexter4054 5 місяців тому
@@shubham-itachi nah, the interviewer was a jerk but i am having another next week
@shubham-itachi
@shubham-itachi 5 місяців тому
@@tommytexter4054 Bro you learned iOS swift development so is Mac mini m2 16/256gb enough for hardcore xcode development. I get it in $800 education discount. Can I buy
@danielniels22
@danielniels22 2 місяці тому
@@tommytexter4054 how were all your interviews going? did you land an ios engineer role?
@nithinyel3836
@nithinyel3836 10 місяців тому
the most awaited video !!
@seanallen
@seanallen 10 місяців тому
Hope you enjoy!
@misran449
@misran449 10 місяців тому
Man Sean!!! dude thank you!!
@seanallen
@seanallen 9 місяців тому
Happy to help!
@TechRagh
@TechRagh 10 місяців тому
Thanks Sean! ❤
@seanallen
@seanallen 10 місяців тому
You're welcome!
@tracytim
@tracytim 3 місяці тому
Thanks, Sean. 👍🏼
@indianstate14
@indianstate14 4 місяці тому
This content is Gold ❤
@seanallen
@seanallen 4 місяці тому
Thanks for the kind words and I'm glad you enjoy it!
@vicetbeki3734
@vicetbeki3734 9 місяців тому
Everything is great , you really know what you do , thanks for helping us 👌🏾 I have a question , if I want to create an App switcher with SWIFTUI , what knowledge do I need , I’d like to know which course should I study in order to build it , thanks
@rafaelfelipe2886
@rafaelfelipe2886 9 місяців тому
this is gold!!! thnks!!!
@seanallen
@seanallen 9 місяців тому
Glad you liked it!
@steliostz2661
@steliostz2661 5 місяців тому
excellent video, thank you!
@seanallen
@seanallen 5 місяців тому
Glad you liked it!
@clon-e6096
@clon-e6096 9 місяців тому
I'm a self-taught developer and to be honest I didn't even called for an interview once because I graduated from Business :) Also, I live in Turkey and there are like 20 job posts and they all look for seniors.
@NomadicDmitry
@NomadicDmitry 10 місяців тому
I'm a Test Engineer, but I'm really interested into the iOS. Thanks!
@seanallen
@seanallen 10 місяців тому
Happy to help!
@akashskumar6389
@akashskumar6389 2 місяці тому
soooo geateful for creating this compilation
@seanallen
@seanallen 2 місяці тому
Happy to help!
@yisamulin5636
@yisamulin5636 10 місяців тому
Nice vidio❤ thank you very much!
@seanallen
@seanallen 9 місяців тому
Glad you liked it!
@miketechdev8866
@miketechdev8866 7 місяців тому
great video
@seanallen
@seanallen 7 місяців тому
Thanks!
@ask1218
@ask1218 2 місяці тому
This is amazing
@seanallen
@seanallen 2 місяці тому
Glad you liked it!
@recoveryhubapp
@recoveryhubapp 8 місяців тому
the BOSS
@adhamraouf6656
@adhamraouf6656 4 місяці тому
Hello Pro, Thank you for your awesome videos; I've learned a lot from them. If you could do us a favor and explain what we should focus on in problem-solving questions during interviews, we would be very thankful.❤❤
@rohitozvlogs1617
@rohitozvlogs1617 Місяць тому
Just wow! 👏🏻
@seanallen
@seanallen Місяць тому
Glad you liked it :)
@zapakitul
@zapakitul 10 місяців тому
I am not at all interested in iOS specific programming. I have a big distaste for modern programming languages (swift, rust, etc). Even so, your videos are really high value and full of knowledge to keep a 00’s coder up-to-date with the modern standards and practices. I wish I had access to resources like yours when I started programming in C89 or even C# back in the day. Thank you for teaching the next generation with so much care and detail.
@seanallen
@seanallen 9 місяців тому
Happy to hear you enjoy the content even though you aren't into iOS Dev 😀
@karlostj4683
@karlostj4683 9 місяців тому
Here's one problem with converting incoming JSON from "snake case" to "camel case": Someone else looking to find where the REST API-based JSON "avatar_url" shows up in your Swift code won't find it and won't know to search for "avatarUrl" - and vice versa. You're converting from one arbitrary readability standard (either Python or JS) to another arbitrary readability standard (Swift). And yes, they are both arbitrary. This becomes a Maintainability issue: After you win Powerball and are never heard from again, someone else is going to have to be able to understand your code without you around to answer questions about it.
@salibhaldar6568
@salibhaldar6568 5 місяців тому
While Creating Generic Fetch Data Function, what’s the use of “For” parameter? It was not used inside.
@viveksehrawat36
@viveksehrawat36 10 місяців тому
great
@LexicalNoScope
@LexicalNoScope 10 місяців тому
Thank you so much. This is incredibly helpful. I’ve been on the fence about getting an iOS dev job or web dev so I have been learning both (SwiftUI and Next js mainly). There are basically 0 places hiring for either that aren’t government jobs within an hour drive of me so it would have to be remote. Does anyone who has experience with both (remote) have any advice?
@seanallen
@seanallen 10 місяців тому
Happy to hear it's helpful. Hope you enjoy it!
@SlavisWolf
@SlavisWolf 5 місяців тому
Thanks for your content, I'm preparing for applying to english jobs and I find this video very handy. I am not an iOS beginner, I've been working in iOS programing the last five years but your video is being very useful to review some concepts. The only drawback I'd point out is that you speak very fast for me because I'm a non native english speaker and it's dificult keep up with your rhythm. But that is really my fault not yours 🤣 🤣
@seanallen
@seanallen 5 місяців тому
I've been told I speak fast and I've actually slowed down a lot over the years, lol. It's something I work on but can always improve. Luckily UKposts has playback speeds. Glad you enjoyed the video!
@ghreacts
@ghreacts 3 місяці тому
I have a quick question. It has been 6 months since you posted but i hope you would see this. In the generic example, if i was to use func createName(person1: Name, person2: Name){} ---> and i create a protocol for the type NAMe, will it still work?
@bruhmoment3731
@bruhmoment3731 6 днів тому
how long until prompting becomes an important part of coding interviews?
@shreyanshmishra6613
@shreyanshmishra6613 10 місяців тому
Network calls are very intuitive if you have fundamental knowledge of how client server works. Its a cake walk for fullstack devs.
@seanallen
@seanallen 10 місяців тому
That's a pretty big "if" tho.
@shreyanshmishra6613
@shreyanshmishra6613 10 місяців тому
@@seanallen I don't know man. Knowing fundamentals are pretty essential to becoming a better developer. Understanding how computers work or communicate on a high level is necessary.
@seanallen
@seanallen 10 місяців тому
I didn't say it wasn't necessary. I was pointing out that most people watching this video and learning about network calls in Swift on UKposts are not fullstack devs with a fundamental knowledge of client/servers.
@shreyanshmishra6613
@shreyanshmishra6613 10 місяців тому
@@seanallen You are doing a great job here. Love your videos. I'm just saying, if you are talking network calls you can also talk about client/servers. You said network calls are tough. But is that true? No. Will your audience find it tough if they didn't know the basics already? Yes. I don't know wheather you have videos teaching fundamentals but if you don't that's a gap to fill. Most people start by becoming a frameworkers, not engineers. Instead of learning UIkit, SwiftUi, jetpack, flutter, react, express, learn the principles of programming. Become software devs not ios devs.
@user-yd9xy3rb4x
@user-yd9xy3rb4x 7 місяців тому
Looks like a list for interns/juniors if you get rid of generics
@seanallen
@seanallen 7 місяців тому
That because it is. It’s meant to help people get their first iOS dev job.
@user-yd9xy3rb4x
@user-yd9xy3rb4x 7 місяців тому
@@seanallen that explains it ☺️
@user-yl5ni9bs5g
@user-yl5ni9bs5g 10 місяців тому
Me: I should stop wasting time on videos about sports cars and watch some useful tutorial instead Some useful tutorial: Porsche 911 GT3 Thanks for your work, Sean!
@seanallen
@seanallen 9 місяців тому
Lol, my dream car.
@ViktorJenei
@ViktorJenei 9 місяців тому
Nice collection of topics. However, I would have added a local storage related topic too. As an interviewer myself, it's a very important topic. (UserDefaults, KeyChain, File System usage and DB basics [coredata or even realm]).
@spikesagal
@spikesagal 5 місяців тому
Are you sure that lookup complexity for Array is O(n)? It's O(1) in pretty much every language I've learned. In languages that have true arrays (like Java), it's just a memory pointer with total size and a block size. If you look up an element at n, it's address is just (array address + (n * block size)), which is O(1).
@spikesagal
@spikesagal 5 місяців тому
Oh nm I think I know what you meant: look up by value, not by index.
@kstackz8249
@kstackz8249 9 місяців тому
Do you think CI/CD, jenkins, etc is needed? or a plus
@user-yd9xy3rb4x
@user-yd9xy3rb4x 7 місяців тому
A huge plus for a senior, even though it depends on a team you work on.
@Tyheir
@Tyheir 5 місяців тому
Why does a network call take so many lines of code
@kav04
@kav04 4 місяці тому
its now a ioS dev interview preparations , these are trivial tutorials
@seanallen
@seanallen 4 місяці тому
Disagree. These are fundamental topics & concepts that are always asked about in Jr. iOS dev interviews.
@nickpavlov4012
@nickpavlov4012 9 місяців тому
Hey Sean, please can you tell us is it possible to get a job today with only SwiftUI or you still have to know UIKit? Please give us an answer 🙏
@seanallen
@seanallen 9 місяців тому
Yes, it is possible. More of the jobs will be in UIKit, so it may be a little more difficult at this current time. But over time, SwiftUI will become more and more dominant.
@nickpavlov4012
@nickpavlov4012 9 місяців тому
@@seanallen Thank you so much for quick response! DO you offer private lessons or to help prepare for interview?
@seanallen
@seanallen 9 місяців тому
I don't outwardly offer private lessons but if someone asks and my schedule isn't crazy at the time, then I usually do it. Shoot me an email or a DM on twitter and we can discuss.
@user-yd9xy3rb4x
@user-yd9xy3rb4x 7 місяців тому
Just learn both, swiftui is super unstable for big projects it has a lot of bugs and it’s partly UIKit under the hood
@nickpavlov4012
@nickpavlov4012 7 місяців тому
@@user-yd9xy3rb4x спасибо Денис 💪
@dominicmm6
@dominicmm6 10 місяців тому
Combine videos please🙏🏼Edit: Buying interview course next week
@seanallen
@seanallen 9 місяців тому
Hey Dom! Hope you enjoy the job interview course! Combine seems to be a framework that Apple is leaving behind so I don't have plans create content about it.
@dominicmm6
@dominicmm6 9 місяців тому
@@seanallen good to know thanks!
@user-yd9xy3rb4x
@user-yd9xy3rb4x 7 місяців тому
@@seanallen why do you think that they are leaving it behind??? SwiftUI uses it a lot. It’s faster than RXSwift. I don’t think they are leaving it.
@Welcome_to_real_life_
@Welcome_to_real_life_ 7 місяців тому
1k . like is from me.
@user-lv8jm7bv9w
@user-lv8jm7bv9w 10 місяців тому
To be honest, these are so simple that nobody even asks in China.
@link123triFoRce
@link123triFoRce 10 місяців тому
What do they ask in China?
@user-yd9xy3rb4x
@user-yd9xy3rb4x 7 місяців тому
Agree.
@user-lv8jm7bv9w
@user-lv8jm7bv9w 4 місяці тому
such as, the source code of runtime(gdc, weak reference...), crash report, memory monitor, system design @@link123triFoRce
@kav04
@kav04 4 місяці тому
agree, primitive questions. useless for real iOS dev interview
@salibhaldar6568
@salibhaldar6568 5 місяців тому
While Creating Generic Fetch Data Function, what’s the use of “For” parameter? It was not used inside.
@seanallen
@seanallen 5 місяців тому
That's an argument label. It just helps with readability of the function at the call site, it's not used inside the function. You can read more about them here -docs.swift.org/swift-book/documentation/the-swift-programming-language/functions/
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