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How to do 'serial' animation with GCD?
//customView.alpha = 1.0 here
[UIView animateWithDuration:1 animations:^{
                                  customView.alpha = 0.3;
                              }
                              completion:^(BOOL finished){
                                  // remove customView from super view.
                              }];

//(dispatch_queue_t)queue was created in other parts of the code
dispatch_sync(queue, ^{
    [UIView animationWithDuration:animations:...];
});

- (void)methodThatIsRunWhenTheNotificationIsReceived {
    // Do other stuff here I assume...
    self.numberOfTimesToRunAnimation = self.numberOfTimesToRunAnimation + 1;
    if ([self.numberOfTimesToRunAnimation == 1]) {
        [self methodThatAnimates];
    }
}

- (void)methodThatAnimates {
    if (self.numberOfTimesToRunAnimation > 0) {
        // Animation preparations ...
        [UIView animateWithDuration:1
                         animations:^{
                                  customView.alpha = 0.3;
                         }
                         completion:^(BOOL finished){
                                  // Animation clean up ...
                                  self.numberOfTimesToRunAnimation = self.numberOfTimesToRunAnimation - 1;
                                  [self methodThatAnimates];
                         }];
    }
}