iphone - UIImageViews in NSMutable Arrays -

i in process of making game avalanche ipod family. have random objects appearing @ top , dropping down set of lines go :

[uiview setanimationsdidstopselector:@selector(onanimationcomplete:finished:context:)];   [uiview setanimationdelegate:self];   [uiview commitanimations]; 

i have created uiimageview so:

uiimageview* debrisview= [[uiimageview alloc] initwithimage: debris]; 

i want put debrisview in array , iterate through see frame (or coordinates). want able compare coordinates player see if touch , not (therefore game over). how add multiple (more 500) "debrisview" array, compare frame within array moveable uiimageview.. named player see if coordinates of falling debris match or touching player? , far memory goes, how rid of "debrisview" in array when object touches bottom screen? please point me in right direction or explain me? new objective - c. appreciated. in advance!

-dustin

as far memory goes, shouldn't using uikit this. cocos2d better games, , can use box2d or chipmunk physics.