Passing variables from delegate iOS

im passing an array from my app delegate to a view controller as follows :

Delegate *appDelegate = [[UIApplication sharedApplication] delegate];
self.rows = appDelegate.getCourseArray;

My question is, when do i release 'appDelegate'? i tried to release it after the variable is passed but that makes a开发者_StackOverflow blank screen (Black). I imagine its because im releasing the actual delegate and not the copy, but in this instance, am i supposed to release it?

You don't release it at all as you don't have ownership of it as per Apples Memory Management Rules.

There is no new, allco, retain or copy (NARC) in the line that obtains the appDelegate to there is no ownership and no release/autorelease needs or should be issued.