Objective-C delay action with blocks

Question

I know that there are several ways of delaying an action in Objective-C like:

performSelector:withObject:afterDelay:

or using NSTimer

Answer 1

Expanding on the accepted answer, I created a Helper function for anyone who doesn't care to memorize the syntax each time they want to do this :) I simply have a Utils class with this:

Usage:

[Utils delayCallback:^{
     //--- code here
} forTotalSeconds:0.3];

Helper method:

+ (void) delayCallback: (void(^)(void))callback forTotalSeconds: (double)delayInSeconds{

     dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
     dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
           if(callback){
                callback();
           }
      });
}