Question

I have a few functions that I need to call when I press a button. I use [self getamountofdatacenters]; to call these functions. When I press the button, the simulator gets stuck until its done with all the functions, and this takes 5-7 seconds, so I’m trying to use NSThread:

[NSThread detachNewThreadSelector:@selector(GETAMOUNTDATACENTERS) 
                         toTarget:self 
                       withObject:nil];

I’m doing this three times with different functions, but I want to find out what the progress is of an NSThread and to catch it when it’s actually done. How can I do this? Thank you.

Answer 1

Forget about explicit threads and use GCD:

dispatch_async(dispatch_get_global_queue(0, NULL), ^{
    [self getNumberOfDataCenters];
    dispatch_sync(dispatch_get_main_queue(), ^{
        // The work is done, do whatever you need.
        // This code is executed on the main thread,
        // so that you can update the UI.
    });
});