Question

I have an application written in xcode/cocoa on Mac.
A label on the main window is changed in every occurrence of a heavy loop with [label setStringValue], however it is refreshed only at the end of the loop.
How can I have it refreshed in each occurrence ?

Thanks !

Answer 1

You should use a queue. Your heavy loop in backgroundQueue and [label setStringValue] in mainQueue.

Example:

dispatch_queue_t backgroundQueue = 
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

dispatch_queue_t mainQueue = dispatch_get_main_queue();


dispatch_async(backgroundQueue,^{
//Your loop

    dispatch_async(mainQueue,^{
    //Set Label value
    });

});