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?

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

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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.