Question

There are methods performSelectorInBackground: and performSelector: afterDelay: in NSObject. How to combine them in one line of code?
Maybe somehow with NSTimer?

Answer 1

Have you considered using blocks for that?

double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0),
^(void){
    //your code here
});

Also, if it seems like too much writing, there’s already a snippet for it, start typing “dispatch_after” and you’ll see it.