Delegate in swift Protocol Pattern Tutorial | Delegate in Swift iOS | Delegate design pattern

[@CodeCat15]

The delegate pattern is just like the function pointers in c and c++ but usually explained with a ton of high-funda technical words, but codecat15 always tries to make and explain things in the simplest way so that young developers can leverage this pattern and understand the actual meaning of this. I hope you not only learn but understand this pattern and use it in your project. You may download the source code files from the description link and play with it. Part 2 of this video is coming soon. Until then please subscribe to the channel if you find this helpful in understanding swift in a simple way 👍 And don't hesitate to ask me any questions via comments or on the email.

[@vyankateshshivnikar7932]

Please make a video on autolayout

[@diliptilonia]

ab tak mai, jab bhi data transfer karna hota tha to main blindly delegate & protocol ke path use karta the, but now I understand the actual mean of it when you did without protocol, thanks for sharing your knowledge.

[@CodeCat15]

@Dilip: closures vala bhi video dekhna coz usmai maine comparison kiya hai delegate and closure approach ka. Aapne ios group k saath bhi share karna.

[@hardipgajera2316]

your teaching way is clean and very powerful !! please keep it up

[@CodeCat15]

Thank you Hardip for your kind words 😊 if you have any questions then please feel free to ask

[@jaisinghsisodia8202]

Now i got whole understanding of custom delegate and where we have to use that . I like the way you relate each concept with our daily life example which trigger quickly.Thanks a lot buddy

[@CodeCat15]

There’s also a video on closure delegate pattern where am comparing delegates done via closure and protocols, do check that out as well. And thanks a lot for the kind words 😊 I try to simplify things by connecting them with the real world coz that way you remember the actual usage than some bookish verbiage Link: kzbin.info/www/bejne/i5LJfZyIq6eqhKM

[@jaisinghsisodia8202]

@@CodeCat15 Ya i went through with that video and also referring all your videos .

[@CodeCat15]

Cool feel free to ask questions if you have any will be happy to answer them

[@natureloverspakistan]

simple and straightforward .. nice tutorial .. please also make a tutorial on weak, strong, unowned etc.. we cannot explain to interviewer when they asked about that :(

[@CodeCat15]

Ok no worries, I will highlight this topic in my upcoming video as well. Thank you for bringing this up I will add it in my list.

[@mohittomer9232]

You make a really very awesome videos, I have watch your 6--8 videos that really helpful for me. Keep it up bro. Thanks for these contents.

[@CodeCat15]

Welcome to the channel Mohit, I am glad these videos are helpful. Please feel free to ask questions and do share the same with your iOS group.

[@shahzaibqureshi6192]

Bhai kia mast samjhatay ho yr aap. bht aala

[@CodeCat15]

Thank you :)

[@rohitnishad5261]

Your all video great bro

[@CodeCat15]

Thank you, am glad they are helpful

[@rishilund4120]

Bhai the main thing is you take exaples and you teach us from the basics keep continue your work

[@CodeCat15]

I am glad this was helpful Rishi, please feel free to ask questions and do share the video with your iOS group

[@rishilund4120]

Definitely bro

[@arbintajnawaz7200]

Thank God finally I found one quite understandable video . Keep it up😀😀😃😃😃

[@CodeCat15]

Welcome to the channel Arbin, i am glad this video was helpful. Plz feel free to ask questions on the topic and do share the video with your iOS group on WhatsApp or Facebook

[@shivshankargupta4051]

Thanks man, finally clear all doubts.

[@CodeCat15]

Hey @Shivshankar welcome to the channel, do feel free to ask questions on this topic and do subscribe and share this channel with your iOS group

[@samargupta7355]

Hey you are so good, Keep it up. Doing great job man.

[@CodeCat15]

Hello @Samar welcome to the channel. Thanks for the kind words and please do ask questions on this topic if you have any. I recommend watching the closures delegate video as well so that you get a good grip between closure vs protocol delegate pattern too. Please do subscribe to the channel and do share it with your iOS group over WhatsApp or Facebook or anyone who wants to learn swift programming 🙏

[@natureloverspakistan]

i anyways implement delegates using protocol ..another toist from my side vc class ko tableview cell me as a reference pas ker ke vc class ke function call kiye the leki mujh ye approach sahi nae lgi.. r sch me pehly mujh pta b nae tha ...ye b pure delegate pattern approach he .. :p thanks for sharing valuable information

[@sunishram85]

Hi, Please make video on AppDelegate vs SceneDelegate

[@raviborad2661]

Thanks, Mate, Good explanation :)

[@neerajgupta8241]

very good explanation.

[@CodeCat15]

Thanks Neeraj

[@MithleshKumar-qn6ki]

Great work man! Keep it up 👍

[@CodeCat15]

Thanks Mithlesh and welcome to the channel. Hope this video gave you all the details you were looking for and if not then plz do feel free to ask questions about it I will be happy to answer them. Do share this channel with your iOS group on WhatsApp or Facebook 😊

[@AhsanZahidDevb]

The best explanation and Nice Tutorial 👍🏻 Goku is also my favorite 😉

[@CodeCat15]

Nice dragon ball z was my first anime but on the longer run i started liking vegeta, as of now watching black clover and just finisher attack on titans and Naruto apart from that do ask questions on delegates if you have some 👍

[@puneetbhagat7691]

Thanks sir to share the awesome lecture 👍👍🙏🙏🙏

[@CodeCat15]

@Puneet: Thank you Puneet, am glad it helped. If you have any questions then don’t hesitate to ask.

[@rehanismail7082]

Best explanation love your tutorials @Code Cat

[@CodeCat15]

Hey @Rehan welcome to the channel and thank you for your comments, please feel free to ask questions and do subscribe to the channel and share this video with your iOS group on Facebook or WhatsApp or whoever wants to learn

[@garimavishwakarma337]

sir, can we communicate with more than two classes at the time using prototcol and delegate method?

[@CodeCat15]

delegate can give you the result of a particular operation so what you can do is perhaps create a wrapper where you can call multiple classes and once you get the responses from those classes then in that case you can pass this response to the delegate accordingly, this is a design problem and perhaps if you email me what you are looking for and what have you tried I can do a quick review when I get time.

[@nehajain4736]

Hello Ravi, Your explanations are really good and very understandable too. I found a point in this video which is required bit more clarification which I want to highlight here. You started with an approach where you were not using . After that you specified reason, why we should use and that reason was to avoid human error regarding function declaration. Might be developer forgot to write function. That is right but can you specify a bit more like - As per my understanding, we use that keyword it give/provide us flexibility to add required function directly while you add/Fetch protocol in your class. So that, developer will never forget to implement that function whenever/where ever, he/she required it and through this we can maintain function names as well. If I said something wrong please correct me. Thanks for your videos. Your videos are really good and admirable.

[@CodeCat15]

what you said is true, and that too is a human error that you are trying to avoid as well, the main role of a protocol is to implement a set of common functions that you will use in your module and then enforce the developer to use them. One more reason here is that if you use protocols you achieve abstraction. Protocols can be used in many ways if you watch my latest video on concurrency with core data there you will get more insights on a real project scenario to use protocols and also to implement ISP principle. I hope I was able to answer your question and if not then please feel free to ask more questions. Welcome to the channel Neha

[@nehajain4736]

@@CodeCat15 Thanks for your reply yes my doubt is clear now. 😊

[@ganesha3559]

Sir, very good explanation. I really like your video especially the flow of explanation with analogies :) Kindly keep up the good work. I had 1 question: it might be silly but still worth a shot. Since the Developer Instance is getting created inside Manager anyways, why cant Developer simply return the value of the addition?

[@CodeCat15]

let's go by your approach, how do you think the developer would return the response from it's function without creating a reference inside the manager? You can't without the instance of the developer so we create the developer instance inside the manager, however this was just a demo and if your class has a dependency then that dependency must be injected that created inside a function or class. Let me know if this answers your question and if not then please ask more.

[@ganesha3559]

​@@CodeCat15 I dont fully understand. So i made a GIST to convey my question. gist.github.com/ganeshsacharya/1b7fbcd7f0cbd5b439c5853f0f15ee6e Can you take a look?

[@shiviparashar7419]

Why we use weak keyword only with class?

[@CodeCat15]

Class are reference type and they can create a reference cycles which leads to memory issues so to make sure reference cycles are not created we have to explicitly specify that they am using weak reference here and once you move out of the closure scope the reference is destroyed avoiding any memory leaks. Let me know if that answers your question Shivi and welcome to the channel

[@YourLeader350]

What do you does. I means are you app developer . In which company .or online developer plz make motive video on chain on what we do by chain after what we will should do

[@CodeCat15]

Hello Usama, welcome to the channel I am a full stack developer, can you explain more what you mean by chain?

[@shreyasinharoy2362]

what is the difference between delegate and protocol?

[@CodeCat15]

Delegate is a design pattern, protocol is a type through which we can achieve that pattern and hence its called delegate protocol, the same delegate pattern can also be achieved via closures so you may come across some developers saying delegate closure protocol as well.

[@AnkitGupta-hv2xe]

I saw some of your videos and I love the way of explanation. Thank you Sir. 100 👍 for CodeCat15.

[@CodeCat15]

I am glad these videos are helpful Ankit, do share them with your iOS group too and feel free to ask questions

[@pratikgajbhiye5354]

What is 15 after CodeCAt

[@CodeCat15]

hey there, welcome to the channel, I like coding and cats and my date of birth is 15 so the channel name is codecat15 😊 Do feel free to ask questions and share this channel with your iOS group or any iOS group on Facebook and what’s app

[@abbasgujjar6057]

Please send your Linked In Profile link

[@niharsaxena9029]

Using class is not a good method:- "Using 'class' keyword to define a class-constrained protocol is deprecated; use 'AnyObject' instead" ... Otherwise this warning will show

[@Roland_Garcia]

This video need CC! Kkkk

[@CodeCat15]

Will work on it, apologies for the inconvenience caused

[@amy1119991]

Not that great explanation! but serves the purpose!

[@CodeCat15]

Hey @Amol thanks for the feedback can you explain what can be improved in the explanation I would like to improve for future videos and try to avoid doing those mistakes. Thanks