Have a dispatch queue listen for the pause button in xcode

dispatchPause.m

//Brandon Levasseur
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
    source = dispatch_source_create(DISPATCH_SOURCE_TYPE_SIGNAL, SIGSTOP, 0, queue);
    
    if (source) {
        dispatch_source_set_event_handler(source, ^{
            NSLog(@"Hi, I am: %@", weakSelf);
        });
        dispatch_resume(source);
    }
});