Swift Observer & Notification Pattern Tutorial - iOS Communication Patterns Part 2

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The next topic in my series on iOS Interview questions explains the Observer and Notification Communication Pattern in Swift. This is a fundamental question in iOS development and I was asked about it a lot during my interviews. In this tutorial I'll walk you through how the observer and notification pattern in Swift works, using Xcode.

iOS Communication Patterns Part 1 - Delegates & Protocols:

This is part of a series of videos about iOS interview questions in Swift. Check out the overview where I list and briefly discuss all the topics that are in this series:

Project Source Code:

iOS Dev Courses:

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Book and learning recommendations that help out the channel if you decide to purchase (Affiliate Links):

Paul Hudson's Hacking With Swift:

Donny Wals - Combine:

Mark Moeyken’s SwiftUI Books:

Ray Wenderlich Books:

#swift #softwaredeveloper #iosdeveloper

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Love the pace, didn't need to watch at 1.25x like many other channels

rsdntevl

use of star wars app gives "Force unwrap" a whole new shiny feeling

drforest

I dig your videos Sean. Words cannot say how much youve saved my iOS dev ass.

eluphantakrr

I agree with a few others who have shared the same sentiment. I love your pace. It gets really boring when people talk slowly fabricating a personality that is not true to theirs, your videos are amazing because it is very organic. And if I want to pay attention very loosely, l could always use the speed controls in YouTube to slow down the video. Again, love your tutorials!

scarlet

Jesus, if I had found your videos last January I would have passed interviews with flying colors. SUPERB!!!

duncanwallace

You're literally my Home Page, Sean. I really admire your dedication and hard work for us, thank you once again!

zzaaazz

Great quick intro to Notifications. Quick thing I wanted to point out, with iOS 9, it is no longer necessary for an NotificationCenter observer to un-register itself when being deallocated.

AbhishekBanthia

very good video, nobody on youtube is as clear and conscience as you

jelly

I press like before i even watch. Because i know video will be with high educational quality. Thank you very much for your incredible work

BekaDemuradze

Thank you Sean Allen for your tutorial. Appreciated can watch so helpful videos here before my interview tomorrow. I am watching your video on 0.75 pace. :)

ericho

Best explanation.
Searched for hours.
THANK YOU!

infinite

I have just found your channel. Its great. Explanations are short and acurate. I want to be an ios and mac developer myself but i have done a java boot camp because there was no swift on here in poland ;(

Himegw

Love your videos! Especially this one solved all the problems I've been struggling of. Thanks!

어플-mf

Great Video! Saved me from a huge headache with protocols . Thank you

SainvilHeisman

Great tutorials Sean! I love all of them. Keep going.

khislatjonvalijonov

Here I list pros and cons for notifications observer - please correct me if I'm wrong or if I missed anything. Thanks in advanced!
pros:
1. Observer encapsulate the details of what should do after received the signal
2. A link(reference) between observer and notifiers is not required
Cons:
1. Observer could be messier - since observer has to handle all scenarios (many) after received the notifications.
2. Notifier should know the name of notification - should be defined public, otherwise, once your change a name of notification, you would need to change all where you declare it.
3. Before iOS 9, it requires a clean up for observer.

deletage-protocol
pros:
1.Intern has less code
cons:
1. requires a reference between Boss to Intern
2. Details of what an Intern should do is exposed - against the encapsulation.

monicaluo

Here we go again, I watch it for the fifth time with

Денис-жфр

Thanks Sean. Love to see your tutorials!

prashantsharma-nwcc

Well. That was real quick and really helpful.

rohanghorpade

Absolutely amazing videos man ! God bless you I absolutely love them ! To the point, with a great pace, Keep up

ahmedsurvival

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