> On Apr 25, 2017, at 9:51 AM, Dave <[email protected]> wrote:
>
> Mac Project.
>
> Hi All,
>
> I’m using performSelector: withObject: afterDelay: in order to postpone
> further processing until after the current method/run loop as expired, this
> puts the request at the End of the Queue, my question is, is there anyway of
> putting it at the head of the Queue so it gets processing before other
> requests?
>
> All the Best
> Dave
Consider using NSOperationQueue (OperationQueue if you’re using Swift) instead
of performSelector:withObject:afterDelay:, and have a look at the queuePriority
property on Operation/NSOperation. The following code:
> import Foundation
>
> let op1 = BlockOperation {
> print("op1")
> }
>
> let op2 = BlockOperation {
> print("op2")
> }
>
> let quitOp = BlockOperation {
> exit(0)
> }
>
> quitOp.addDependency(op1)
> quitOp.addDependency(op2)
>
> op1.queuePriority = .veryLow
> op2.queuePriority = .veryHigh
>
> OperationQueue.main.addOperations([op1, op2, quitOp], waitUntilFinished:
> false)
>
> RunLoop.main.run()
outputs:
> op2
> op1
This shouldn’t be taken as a guarantee, but it does make it more likely that
your operation will be executed before others.
Charles
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