Swift 2 to 3 Migration dispatch_get_global_queue

Question

I have the following code that I've been trying to translate into swift 3 from swift 2. Here is what I have so far.

DispatchQueue.async(group: DispatchQueue.global(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),execute: {
            self.controllerDelegate?.codeToRun(progressWindowViewController: self)
        })

I am getting an error that says Cannot invoke 'global' with an argument list of type (int,int). I know that the global queue needs this though unless they changed it in swift 3? What is the correct way to do global queues in Swift 3?

Previous Swift 2 Equivlent

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),{
            self.controllerDelegate?.codeToRun(self)
        })

Also here: http://stackoverflow.com/questions/37805885/how-to-create-dispatch-queue-in-swift-3. — Martin R, Sep 28 '16 at 11:15

score 10 · Accepted Answer · edited Sep 28 '16 at 10:19

10

Try this it will work.

DispatchQueue.global(qos: .background).async {

    DispatchQueue.main.async {

    }
})

If you still need any help feel free to ask here.

edited Sep 28 '16 at 10:19

Eric Aya

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answered Sep 28 '16 at 10:17

JAck

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Thanks so much exactly what I was looking for. I guess they made some kind of new qos: class thing now to describe the different types of threads. – Joseph Astrahan Sep 28 '16 at 10:19
always Welcome dude.. – JAck Sep 28 '16 at 10:19
my previous code started with async from the main thread hope that will not be issue. I'll have to play around with it. Will this code work in reverse also? Like starting with DispatchQueue.main.async? – Joseph Astrahan Sep 28 '16 at 10:19
Yep. It will work both way.. – JAck Sep 28 '16 at 10:20
thanks you save my time... – ikbal Oct 04 '16 at 08:57

score 2 · Answer 2 · answered Sep 28 '16 at 10:51

2

Actually, a closer and simpler approach to your question would be:

DispatchQueue.global(qos: .default).async { ... }

answered Sep 28 '16 at 10:51

Ernesto Fernandez

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Out of curiosity what makes this answer faster, might change which answer is accepted – Joseph Astrahan Jun 12 '17 at 15:32
@JosephAstrahan it's not faster, but definitely closer to what you were proposing, having a single completion block instead of 2. Anyway, the chosen answer is correct as well. – Ernesto Fernandez Jun 13 '17 at 10:20

Swift 2 to 3 Migration dispatch_get_global_queue

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