How can I replace deprecated method dispatch_get_current_queue()? [duplicate]

问题

I am developing a chat application using xmppframework in iOS 5; it works perfectly.

But I updated my Xcode to 4.5.1, iOS 5 to iOS 6 and my Mac OS to 10.7.5, and the project did not work due to deprecation issues. I replaced all methods with new methods in iOS 6 except this one:

dispatch_get_current_queue()

How can I replace this method in iOS 6?

回答1:

It depends what you need to achieve with this call.
Apple states that it should be used for debugging anyway.

Perhaps the queue does not matter (as you just need a background queue) so get a global queue with specific priority (dispatch_get_global_queue(dispatch_queue_priority_t priority, unsigned long flags);)

OR,

If you do need to execute some pieces of code in the same queue , create a queue, retain it and dispatch all your tasks there.

回答2:

How about using NSOperationQueue?

-(void) doSomeThing:(void (^)(BOOL success)) completionHandler
{
    NSOperationQueue* callbackQueue = [NSOperationQueue currentQueue];
    if(!callbackQueue) {
        callbackQueue = [NSOperationQueue mainQueue];
    }
    dispatch_async(...,^{
         // do heavyweight stuff here
         // then call completionHandler
         if(completionHandler) {
             [callbackQueue addOperationWithBlock:^{
                 completionHandler(...);
             }];
         }
    });

来源：https://stackoverflow.com/questions/12842166/how-can-i-replace-deprecated-method-dispatch-get-current-queue

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iphone

ios

grand-central-dispatch