iOS Concurrency with GCD and Operations - Part 1: | Ray Wenderlich

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Get an in depth look at what’s covered in our video tutorial course iOS Concurrency with GCD & Operations.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/3648-ios-concurrency-with-gcd-and-operations/lessons/1
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Links mentioned in this video:

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Thank you, Audrey. I enjoyed your presentation.

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Thanks for this course. I look forward to watch the next episodes. It’s very well done. :thumbsup:

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This is really nice course but It left some doubts in my mind…

Is synchronous tasks in concurrent queue and async task in serial Queue is same??

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hi Rakesh: I cover this in Part 2 — sync/async is about what happens on the source queue; serial/concurrent is about what happens on the destination queue, so the answer to your question is “no”: sync task on concurrent queue blocks its source queue and runs with other tasks on the concurrent queue; async task on serial queue doesn’t block its source, but must wait its turn in the serial queue

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Screen Shot 2017-03-14 at 2.13.46 PM.png1309Ă—619 61.3 KB

Hi Audrey,

Is it possible to return a value from main() in an asynchronous Operation ?
In this image, I would want to send a reference of the downloadTask to my DownloadManager class.

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hi Preetham: you should supply a completion handler as one of the operation’s inputs; when the operation finishes, it sends back whatever you specify. In my upcoming URLSession video course, I write a QueryOperation subclass of AsyncOperation, and one of its input parameters is a completion handler that returns output and error when the operation finishes.

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Thank you so much for the reply.
Please include Caching as a part of the URLSession video course too.
Love the way you explain… Thanks :slight_smile:

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there’s a bit about caching policy … have a look when it comes out, and leave a comment if you’d like to know more.

an odd thing about the cache policy enumeration: when I tried changing from the default in playground, it kept showing a message that “this isn’t implemented”, so I’m not sure what’s going on there.

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Video is terminating every now and then

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thanks Martin! I’ll ask the web guys to check…

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Hi Audrey, are you planning on upgrading this course to iOS 11, Xcode 9 and Swift 4?

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good question!

pinging the bosses: @raywenderlich @jessycatterwaul @catie

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Hi Kerolos,

Do you know of anything that happened between 2016 and 2017’s releases that you feel is not covered well enough in this release? This is incredibly important material, but I don’t know of anything new that warranted an update after last WWDC. I’m currently going with the idea of having this course updated after Swift 5 comes out, because I know that will represent a major change for concurrency. During WWDC, I plan to assess if that release will take too long. If it will, then an update for iOS 12, Xcode 10, and Swift 4.2 or so might make more sense.

@audrey

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Dear Miss Audrey,

If i want to learn more and understand deeply about iOS concurrency with GCD & Operations, besides your videos, does Raywenderlich’s bookstore have any books talk about it deeply like your videos too ?
If there is any books like this, would you please show me the title of that book?
Your support is really important to me.

Best regards,

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hi! I can’t think of any of our books that cover concurrency in more detail than this course. We have a few tutorials: I include links to them in the course, or just search for them on the site.

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Dear Miss Audrey,
Thanks for your quick answer.
I will search from Raywenderlich site about this topic as your suggestion.
Once again, thank you so much for your reply.

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Hi Audrey very in depth tutorial,
Can I get to watch Sam Davies Concurrency tutorial? I could not find on the website

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@virancheeind Here is the course link:

https://www.raywenderlich.com/4034-introducing-concurrency

I hope it helps!

1 Like