Here is an outline on how you might achieve that.
1- Create a background GCD queue and a GCD semaphore.
2- dispatch_async your sort routine on that queue
3- add a call to dispatch_semaphore_wait before starting your sort. This will
grab the semaphore.
4- at the //wait here point, call dispatch_semaphore_wait on your semaphore.
Since the semaphore was already grabbed, this will block.
5- separately implement some button on your interface, and on the main thread,
its action will be to call dispatch_semaphore_signal. This will release the
semaphore, and make your sort continue
I haven’t tested it, and there may be some devil in the details, but I think
this can work.
Jean-Denis
> On 23 Mar 2016, at 18:48, Ergin Bilgin via swift-users
> <swift-users@swift.org> wrote:
>
> Thank you for help. Maybe I have over simplified my problem. In my first
> example, your advice was totally fine. But when I want to do something more
> complex, I could not figure out how to use it. For example, I want to print
> each step in my insertion sort. Like this:
>
> for i in 1..<toSort.count{
> var j: Int = i
> while ((j > 0) && (toSort[j-1] > toSort[j])){
> let temp: Int = toSort[j]
> toSort[j] = toSort[j-1]
> toSort[j-1] = temp
> j--
> print(toSort)
> //Wait here.
> }
> }
>
> I am looking for a solution without tearing the sorting algorithm into
> pieces. (If it is possible.)
>
> Ergin
>
> On 23 March 2016 at 18:52, George King <gwk.li...@gmail.com
> <mailto:gwk.li...@gmail.com>> wrote:
> Hi Ergin,
> Are you familiar with how events are delivered via the application runloop?
> Essentially, you should not create a top-level loop that waits for input; the
> application runloop does this for you. If you want to accumulate 50 clicks,
> create the counter variable in the appropriate NSResponder (or UIResponder on
> iOS), e.g. your root NSView or your NSViewController. Then override `func
> mouseDown(event: NSEvent)` and increment the counter there.
> Hope that helps,
> George
>
>
> >
> > On Mar 23, 2016, at 12:35 PM, Ergin Bilgin via swift-users
> > <swift-users@swift.org <mailto:swift-users@swift.org>> wrote:
> >
> > Hello,
> >
> > I have a very simple while loop and I want to wait for a mouse click(can be
> > a different input, not important) between every step. What I want to
> > achieve is something like this:
> >
> > while (i < 50){
> >
> >
> > print(i)
> >
> > i
> > += 1
> >
> > waitForMouseClick
> > () //Wait here for user input.
> > }
> > I also use Sprite Kit if you can think a solution related to it.
> >
> > Cheers,
> >
> > Ergin
> >
> > _______________________________________________
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> > swift-users@swift.org <mailto:swift-users@swift.org>
> > https://lists.swift.org/mailman/listinfo/swift-users
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>
>
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